Epidemiological characteristics of tick-borne infectious diseases in Hubei Province, 2016-2021 / 中华流行病学杂志

Objective: To understand the epidemiological characteristics of tick-borne infectious diseases (TBID) and the risk factors of severe illness and death in Hubei Province from 2016 to 2021. Methods: Based on the incidence data of fever with thrombocytopenia syndrome (SFTS), tsutsugamushi disease, typhus and other TBID reported during 2016-2021, the epidemiological analysis was conducted. Field investigation results of TBID in areas with high incidence in 2021, logistic regression analysis of population characteristics, epidemiological history and other factors were used to explore the risk factors of severe and fatal cases. In the field vector investigation, free ticks and surface ticks of the host animals in the cases' home and surrounding grassland were monitored and detected. Results: A total of 3 826 TBID cases were reported in Hubei from 2016 to 2021, of which 71.30% (2 728/3 826) were SFTS, 13.04% (499/3 826) were tsutsugamushi disease and 15.66% (599/3 826) were typhus. A total of 44 cases died in 6 years; the fatality rate was 1.15% (44/3 826). In the peak seasons of incidence from May to July, the cases in people engaged in agriculture related work accounted for 84.61% (3 237/3 826). The incidence rate in women was higher than that in men, and the cases aged ≥50 years accounted for 81.02% of the total (3 100/3 826), and the incidence rate increased with age (P<0.001). The TBID cases were distributed in 86 counties and districts in 16 prefectures (municipality). The incidence rates of different areas had significant differences (P<0.05), and there was a certain spatial-temporal clustering and expasion. Bovis microplus and Haemaphysalis longicornis were captured in the field, and the positive rates in host animals and grassland ticks were 10.94% (7/64) and 40.00% (2/5), respectively. Univariate logistic regression analysis results showed that age ≥50 years and leukocyte <2.0×109/L were risk factors for severe illness and death. Conclusions: The TBID reported in Hubei were mainly SFTS, tsutsugamushi disease and typhus. In order to reduce the incidence of TBID, it is necessary to strengthen the prevention and control in women aged ≥50 years and reduce field exposure and tick bites during the epidemic period.

Epidemiological characteristics of typhus in China, 1950-2021 / 中华流行病学杂志

Objective: To analyze the epidemiological characteristics of typhus in China from 1950 to 2021, and discuss the challenges in typhus prevention and control in China and suggest future prevention and control strategies. Methods: Based on the reported data of typhus from 1950 to 2021 in China from the Infectious Disease History Database of China Public Health Science Data Center and the National Notifiable Infectious Disease Reporting Information System of Chinese Center for Disease Control and Prevention, we conducted a descriptive statistical analysis. Mann-Kendall test and circular distribution method were used to analyze the incidence, mortality and case fatality of typhus to reveal the temporal, spatial and population distributions and diagnosis of typhus in China. Results: From 1950 to 2021, a total of 452 965 typhus cases and 7 339 typhus deaths were reported in China, with the cases numbers exceeding 10 000 in 14 years of the 1950s, 1960s and 1980s, respectively. Since 1990s, the reported cases and incidence rate of typhus have decreased dramatically and the most cases were sporadic. However, the reported typhus cases in Anhui, Hubei, Hunan Provinces showed significant uptrends. Although typhus could occur all the year round, but the seasonality was observed with the incidence mainly in summer and autumn. For different provinces from the north to the south, the peaks of typhus' monthly incidence tended to shift to earlier dates. The male to female ratio of the cases was 1.01∶1 (18 529∶18 366). However, more cases occurred in women in recent years. The cases aged ≤9 years accounted for the highest proportion (18.9%), but the number of cases aged ≥50 years showed an upward trend. Most cases were farmers with the proportion increasing year by year. Moreover, the cases in students and scattered-living children also accounted for relatively higher proportions. The median of the interval between onset and diagnosis of typhus was 6 days. Most cases were clinically diagnosed, while the proportion of laboratory-confirmed cases was low and most laboratory cases were confirmed by Well-Felix reaction. Conclusions: Although the incidence and mortality of typhus in China has decreased significantly, the risk for local typhus outbreaks still exists. The prevention and control of typhus still face many challenges. It is indispensable to strengthen the pathogen detection and surveillance for typhus in China.

Salud pública, espacio urbano y exclusión social en la España de posguerra: la epidemia de tifus exantemático en la ciudad de Valencia, 1941-1943 / Public health, urban space and social exclusion in postwar Spain: the exanthematic typhus epidemic in the city of Valencia, 1941-1943

Resumen Tras la Guerra Civil, las deficientes condiciones higiénico-dietéticas de gran parte de la población española favorecieron la aparición de enfermedades epidémicas. El tifus exantemático puso en jaque a las autoridades sanitarias, especialmente durante la primavera de 1941, cuando el ciclo epidemiológico de la enfermedad y la falta de infraestructuras se aliaron para provocar una grave crisis sanitaria. El régimen franquista, consciente de que esta situación dificultaba su legitimación, no dudó en utilizar la exclusión social como parte de su política sanitaria contra esta epidemia. El artículo analiza en profundidad el caso de Valencia, una ciudad que durante la guerra, por hallarse en la retaguardia republicana, había acogido sucesivas oleadas de refugiados a medida que avanzaban las tropas franquistas.

Abstract After the Spanish Civil War, poor hygiene and nutritional deficiencies among a large part of Spain's population contributed to the rise of epidemic diseases. Exanthematic typhus posed a challenge to the health authorities, especially during the spring of 1941, when the epidemiological cycle of the disease and the lack of infrastructures combined to create a serious health crisis. The Franco regime, aware that this situation posed a threat to its legitimacy, promptly used social exclusion as part of its health policy against the epidemic. This article provides an in-depth analysis of the case of Valencia, a city that was behind Republican lines during the war, and therefore received successive waves of refugees as Franco's troops advanced.

Amblyomma sculptum Berlese 1888, Amblyomma ovale Koch 1844 e Amblyomma aureolatum (Pallas 1772) (Acari: Ixodidae): diversidade genética e detecção de riquétsias em diferentes biomas do Brasil / Amblyomma sculptum Berlese 1888, Amblyomma ovale Koch 1844 and Amblyomma aureolatum (Pallas 1772) (Acari: Ixodidae): genetic diversity and detection of rickettsiae in different biomes in Brazil

A febre maculosa (FM) é a principal doença humana associada a carrapatos no Brasil. Amblyomma sculptum,Amblyomma ovale e Amblyomma aureolatum estão entre os principais vetores dos bioagentes da FM no país. Essas espécies têm ampla distribuição no Brasil, mas os casos de FM associados a esses ixodídeos estão restritos a algumas regiões. Sabendo que populações geneticamente distintas de carrapatos podem ter capacidades vetoriais diferentes, o objetivo desta tese foi analisar a diversidade genética e infecção por riquétsias em populações de A. sculptum, A. ovale e A. aureolatum de diferentes biomas do Brasil. As amostras década espécie foram submetidas à extração de DNA, amplificação e sequenciamento de fragmentos dos genes mitocondriais 12S rDNA,16S rDNA, citocromo oxidase subunidade II e da região D-loop para análise dos carrapatos, e fragmentos dos genes gltA, htrA, ompA, ompB e gene D (sca4) para pesquisa de riquétsia. Análises filogenéticas, filogeográficas e populacionais demonstraram que as populações de A. sculptum têm grande diversidade genética no país, porém sem estruturação geográfica ou por biomas, e com indicativo de expansão em algumas populações no Cerrado

Em A. ovale há estruturação populacional em consequência da associação significativa entre as distâncias genéticas e geográficas, com baixo fluxo gênico entre as populações, sugerindo que pode estar ocorrendo um processo de especiação entre as populações do Cerrado e Caatinga e as populações da Mata Atlântica. A. aureolatum tem baixa diversidade genética e ausência de estruturação para região de Mata Atlântica, com indícios de expansão populacional em algumas das áreas analisadas. Nas populações de A. sculptum do Cerrado foram detectadas Rickettsia amblyommatis, Rickettsia felis (primeiro relato dessas riquétsias nesse ixodídeo para o bioma) e Candidatus Rickettsia andeanae; e na Mata Atlântica foi identificada Candidatus Rickettsia asemboensis (primeiro registro nessecarrapato) e R. Felis nesse ixodídeo. Em espécimes de A. ovale da Caatinga foi observada a presença de Rickettsia bellii e Rickettsia sp. cepa Mata Atlântica; no bioma Mata Atlântica também foi encontrada Rickettsia sp. cepa Mata Atlântica alémde Ca. R. asemboensis (primeiro registro nesse artrópode para o Brasil) e R. felis (primeiro relato nesse ixodídeo). A. aureolatum de área endêmica para FM brasileira foi detectado com infecção por R. bellii e em área não endêmica foi identificado com R. felis (primeiro encontro nesse carrapato). A estruturação de A. ovale não influenciou nas riquétsias detectadas. Não foi observada relação entre os haplótipos dos carrapatos analisados e a detecção de riquétsias. (AU)

Caso probable de tifus murino con falla ventilatoria en una adolescente del área urbana de Cali, Colombia / Probable case of murine typhus with respiratory failure in an adolescent from the urban area of Cali, Colombia

El tifus murino es una enfermedad infecciosa de carácter zoonótico causada por Rickettsia typhi . Se presenta el caso de una paciente femenina de 13 años edad, procedente del área urbana de la ciudad de Cali, quien presentó un cuadro febril asociado a taquipnea y exantema maculopapular generalizado en tronco y extremidades. Durante las primeras 48 h en la UCI pediátrica desarrolló rápido deterioro clínico, fiebre persistente, aumento de reactantes de fase aguda, presencia de infiltrados pulmonares intersticiales bilaterales y derrame pleural, requiriendo ventilación mecánica no invasiva. Se inició tratamiento con doxiciclina frente a la sospecha de una posible infección por agentes rickettsiales. Veinticuatro horas más tarde la paciente presentó mejoría clínica, resolución del exantema y retiro de la ventilación no invasiva. Por medio de la prueba de inmunofluorescencia indirecta se evidenciaron títulos de 1:512 frente al grupo del tifus, constatando el diagnóstico probable de tifus murino.

Murine typhus is a zoonotic infectious disease caused by Rickettsia typhi . We report a case of a 13-year old female patient from the urban area of the city of Cali, who presented with fever, associated with tachypnoea and generalised maculopapular exanthema on the trunk and limbs. During the first 48 h in the paediatric ICU, she rapidly deteriorated, with persistent fever, increased acute phase reactants, bilateral interstitial pulmonary infiltrates and pleural effusion requiring noninvasive ventilation. Treatment with doxycycline was initiated due to a suspected infection by rickettsial agents. Twenty-four hours later the patient presented clinical improvement and resolution of the exanthema, thus the non-invasive ventilation was withdrawn. By means of a indirect immunofluorescence test, titres of 1:512 were shown against the typhus group, leading to the probable diagnosis of murine typhus.

As epidemias nas notícias em Portugal: cólera, peste, tifo, gripe e varíola, 1854-1918 / Epidemics in the news in Portugal: cholera, plague, typhus, influenza and smallpox, 1854-1918

Em períodos de crise sanitária grave como os de 1854-1856, 1899 e 1918, especialmente no Porto, onde cólera-morbo, peste bubónica, tifo exantemático, gripe pneumónica e varíola mataram percentagens elevadas da população, as imagens das epidemias na imprensa permitem-nos identificar os conhecimentos científicos num país considerado periférico, mas que dispunha de estudos e pessoal especializado no nível dos mais avançados da época. Uma base de dados de 6.700 notícias, artigos e anúncios revela-nos o conhecimento médico e farmacêutico da segunda metade do século XIX e início do XX, o modo como era transmitido e divulgado ao público e as soluções apresentadas pelas autoridades sanitárias. Um fator foi sempre salientado nas notícias e anúncios: a higiene.

In severe health crisis like those of 1854-1856, 1899 and 1918, especially in Porto, where cholera morbus, the bubonic plague, typhus fever, pneumonic influenza and smallpox killed high percentages of the population, the images of the epidemics in the press enable us to identify the scientific knowledge in a country considered peripheral, but which had studies and personnel specialized at the most advanced levels for the time. A database of 6,700 news items and announcements reveals the medical and pharmaceutical knowledge of the second half of the nineteenth and early twentieth centuries, the way it was transmitted and disclosed to the public and the solutions offered by the health authorities. Hygiene was consistently highlighted in the news and announcements.

Investigações das riquetsioses: contribuições de cientistas brasileiros / Rickettsiosis investigations: contributions of Brazilian scientists

Justificativa e objetivos: Um crescente interesse em História da Medicina motivou uma investigação de cientistas brasileiros que tenham se destacado em pesquisas médicas. O objetivo do presente estudo foi descrever a história destes cientistas, que muito contribuíram para o conhecimento das riquetsioses. Conteúdo: Durante pesquisa a respeito da descoberta do agente causal do tifo exantemático, doença que por séculos dizimaram viajantes e populações aglomeradas de vilas e cidades europeias encontrou-se o nome de Henrique da Rocha Lima. Este brilhante cientista, além de descobrir o agente causal do tifo, revelou ao mundo um novo gênero de bactérias, as Rickettsias. No Brasil, uma riquetsiose adquiriu relevância epidemiológica a partir da década de 1920: a febre maculosa. Vários brasileiros se destacam em suas pesquisas, dentre eles Amílcar Viana Martins, Octávio de Magalhães e Jose Toledo Piza. Conclusão: Se atualmente há conhecimento e possibilidade de combater as riquetsioses, deve-se a estes pesquisadores, que com muito trabalho e dedicação desvendaram seus aspectos etiológicos, clínicos e fisiopatológicos.

Background and objectives: A special interest in History of Medicine led us to investigate the role of Brazilians who excelled in medical research. In the present study, we describe the contributions of such scientists in nriching the medical knowledge about rickettsiosis. Contents: We have found in the discovery of the causal agent of epidemic exanthematous typhus, a disease that for centuries afflicted travelers and overcrowded European cities and villages, the name of Henrique da Rocha Lima. This brilliant scientist, besides discovering the causal agent of epidemic exanthematous typhus, revealed to the world a new genus of bacteria, the rickettsia. In Brazil, a rickettsial disease acquired epidemiological relevance after the decade of 1920: the Brazilian spotted fever. Several outstanding researchers were involved in this pioneer research, especially Amílcar Viana Martins, Octávio de Magalhães and Jose Toledo Piza. Conclusion: If today we know about rickettsiosis and we can treat them, we owe this fact to these investigators who, with much work and dedication, solved its etiological, clinical and physiopatological aspects.

Rapid Identification of Rickettsiae using the Real-Time PCR

In this study, new real-time PCR method based on the groEL gene was developed and investigated. Four spotted fever group (SFG) strains, four typhus group (TG) strains, and four scrub typhus group (STG) strains were easily differentiated as a distinct entity. This PCR assay was applied to detect Rickettsia DNA from 100 ticks. Twelve Haemaphysalis longicornis ticks were found positive and identified as spotted fever group Rickettsia. This real-time PCR method could simultaneously perform the rapid identification of rickettsiae and the differential diagnosis of SFG, TG, and STG in a single reaction.

The clinical feature and pathogenesis of gastroduodenal lesion in patients with scrub typhus / 대한내과학회지

BACKGROUND/AIMS: The aim of the study was to investigate the gastric involvement of Orientia tsutsugamushi and the relationship between the clinical features and gastritis in patients with scrub typhus. METHODS: The study included 98 patients who had been diagnosed with scrub typhus between January 2003 and December 2006. Sixteen patients were selected to undergo gastroduodenoscopy with endoscopic biopsy for molecular study. The clinical severity index score (CSIS) was evaluated. Rickettsial DNA was amplified using the paraffin- embedded biopsy tissue by performing nested PCR. The expressions of ICAM-1 and VCAM-1 were investigated by immunohistochemistry to evaluate their roles in the pathogenesis of scrub typhus. RESULTS: The endoscopic findings were gastritis (n=1), erosion (n=4) and ulcer (n=11). The average CSIS was 3.65+/-1.09. Four cases of nested PCR of the 16 gastric mucosal biopsies were positive. The gastric samples that were taken earlier after therapy tended to be PCR-positive (2.00+/-00 days vs. 3.83+/-1.27 days, p<0.001). There was no difference of the clinical features and the CSISs between the PCR-positive and PCR-negative patients. The biopsied tissue revealed no vasculitis findings. Staining for ICAM-1 was more expressed in the scrub typhus group as compared with the normal control group. Staining for VCAM-1 was sporadically expressed in the scrub typhus group and normal control group. In comparison with the patients with Helicobacter pylori-associated gastritis, the immunohistochemical staining showed no difference of expression in the patients with O. tsutsugamushi-infected gastritis. CONCLUSIONS: The gastritis seen in scrub typhus patients could be typhus that is related to the direct involvement of O. tsutsugamushi. The increased expression of ICAM-1 may be related with gastric mucosal endothelial injury due to direct infection.

Tropical infections in the ICU.

Certain arthropod-borne infections are common in tropical regions because of favorable climatic conditions. Water-borne infections like leptospirosis are common due to contamination of water especially during the monsoon floods. Infections like malaria, leptospirosis, dengue fever and typhus sometimes cause life threatening organ dysfunction and have several overlapping features. Most patients present with classicial clinical syndromes: fever and thrombocytopenia are common in dengue, malaria and leptospirosis; coagulopathy is frequent in leptospirosis and viral hepatitis. Hepatorenal syndrome is seen in leptospirosis, falciparum malaria and scrub typhus. The pulmonary renal syndrome is caused by falciparium malaria, leptospirosis, Hantavirus infection and scrub typhus. Fever with altered mental status is produced by bacterial meningitis, Japanese B encephalitis, cerebral malarial, typhoid encephalopathy and fulminant hepatic failure due to viral hepatitis. Subtle differences in features of the organ failure exist among these infections. The diagnosis in some of these diseases is made by demonstration of antibodies in serum, and these may be negative in the first week of the illness. Hence empiric therapy for more than one disorder may be justified in a small proportion of cases. In addition to specific anti-infective therapy, management of organ dysfunction includes use of mechanical ventilation, vasopressor drugs, continuous renal replacement therapy and blood products. Timely transfer of these patients to well-equipped ICUs with experience in managing these cases can considerably decrease mortality and morbidity.

Etiología del síndrome febril agudo en la provincia de Jaén, Perú 2004-2005 / Etiology of acute febrile syndrome in Jaen province, Peru 2004-2005

Conocer la etiología del síndrome febril agudo en pacientes que acudieron a tres establecimientos de saludde la provincia de Jaén entre mayo de 2004 y abril de 2005. Materiales y métodos: Estudio descriptivo prospectivo realizado en tres establecimientos de salud: Hospital General de Jaén, Hospital de Apoyo Bellavista y Centro de Salud Morro Solar. Se incluyeron pacientes entre 5 y 65 años con fiebre de menos de ocho días de evolución y sin foco infeccioso aparente. Inicialmente se les realizó gota gruesa para malaria y frotis sanguíneo para Bartonelosis; de los casos negativos se obtuvo una segunda muestra de sangre para la búsqueda de ELISA IgM y microaglutinación para el diagnóstico de leptospirosis, ELISA IgM para dengue, Mayaro, Oropuche y encefalitis equina venezolana, e inmunofluorescenciaindirecta para Rickettsiosis. Resultados: De 1039 febriles incluidos, se determinó la etiología en 680(65,4 por ciento) casos, malaria por P. falciparum 312 (30,0 por ciento), leptospirosis 115 (11,1 por ciento), dengue 105 (10,1 por ciento), malaria por P.vivax 76 (7,3 por ciento), leptospirosis más dengue 30 (2,9 por ciento), Rickettsiosis 15 (1,4 por ciento), Bartonelosis 17 (1,6 por ciento), leptospirosis másRickettsiosis 7 (0,7 por ciento), y leptospirosis, dengue más Rickettsiosis 3 (0,3 por ciento). Los serovares de Leptospira más frecuentesfueron varilla (35,7 por ciento) y bratislava (32,5 por ciento). Conclusión: La malaria es la principal causa de síndrome febril agudo en Jaén, se destaca la presencia de la leptospirosis como segunda causa, por delante del dengue; es necesario considerar dentro del diagnóstico diferencial Rickettsiosis y Bartonelosis.

Objective: To know the etiology of acute febrile syndrome in patients presenting to three healthcare facilities in Jaen province,between May 2004 and April 2005. Materials and methods: A prospective and descriptive study was performed in three healthcare facilities:Jaen General Hospital,Bellavista Support Hospital and Morro Solar Health Center.Patients between 5 and 65 years were included.They had fever for less than eight days and with no apparent infectious etiology. Initially patients were screened with a thick smear blood test for malaria and a thin smear for Bartonellosis.Patients reported as negative for these test underwent a second blood test which included the following assays:IgM ELISA and microagglutination for leptospirosis,IgM ELISA for dengue fever,Mayaro,Oropuche and Venezuelan equine encephalitis, and indirect immunofluorescence for Rickettsiosis. Results: Of 1039 febrile patients included,a diagnosis was made in 80 65,4%)ases:P.alciparum malaria n 12 30,0%),eptospirosis in 15 11,1%),engue ever in 05 10,1%), P.vivax malaria in 76 (7,3%),leptospirosis and dengue fever in 30 (2,9%),rickettsiosis in 15 (1,4%),and leptospirosis plus dengue plus Rickettsiosis in 3 (0,3%).Most frequent Leptospira serovars were varilla (35,7%)and bratislava (32,5%). Conclusion: Malaria is the main cause of acute febrile syndrome in Jaen.It is also noteworthy the presence of leptospirosis in second place,above dengue fever;it is necessary to include this condition,as well as Bartonellosis and Rickettsiosis in the differential diagnosis.

A serological survey of rickettsial infections in the Gazelle Peninsula, East New Britain and a review of the literature

Of the various rickettsial diseases, only scrub typhus has been well documented in Papua New Guinea. A review of the historical literature confirms this. A serological survey was conducted on 113 antenatal patients presenting to a district hospital in Kokopo, East New Britain. Results suggested that a spotted fever rickettsial infection is common in this area with a seroprevalence of about 17% in young women. There was no evidence of scrub typhus or murine (endemic) typhus in the population sampled. Clinical implications of these findings are discussed.

Seroprevalence of Rickettsia japonica on an Island Where a Korean Patient with Japanese Spotted Fever was First Identified / 감염과화학요법

BACKGROUND: Spotted fever group rickettsiosis occurs worldwide and includes various causative organisms depending on the region and clinical features. In Korea, previous studies have shown that several kinds of spotted fever rickettsiae have been identified in ticks, and in stored sera obtained from febrile patients. Previously, it was difficult to correlate the results of serologic or molecular biologic tests with the clinical or epidemiological features of this disease in humans. In 2004, the first Korean patient with Japanese spotted fever (JSF) was identified on Mueui Island, Incheon, Korea. To estimate the prevalence of JSF and to compare the incidence of JSF with those of other infectious diseases endemic to Korea, we performed a serosurvey of Japanese spotted fever and other rickettsiosis (scrub typhus and murine typhus), hemorrhagic fever with renal syndrome and leptospirosis on the island where the patient had been living. MATERIALS AND METHODS: In October 2004, we performed a seroprevalence survey of Mueui Island where nearly 300 persons resided. There were 91 persons who participated in the survey and answered the questionnaire. The participants included 30 healthy subjects receiving a check up at the Health Promotion Center at Inha University Hospital, and 30 patients with rheumatoid factor as control groups for the serologic tests. RESULTS: Of the 91 residents, only one person showed a positive reaction to R. japonica at a titer of 1:80. IgG antibodies against O. tsutsugamushi were positive at a titer of 1:32 in 3 persons, and those against R. typhi were at 1:32 in 1 person and at 1:64 in 2 persons. Serum IgG antibodies to Hantan virus were positive at a dilution of 1:64 in 2 persons and those to leptospira were negative. All 30 healthy persons and 30 patients with rheumatoid factor in the control group showed negative results in 1:40 diluted sera. CONCLUSION: This study demonstrates that the seroprevalence of R. japonica is not as high in Korea as it is in Japan. Further studies should be performed in a large number of patients, including residents of other islands and the Korean peninsula.

A Preliminary Report on the Clinical Efficacy of Telithromycin for the Treatment of Scrub Typhus / 감염과화학요법

BACKGROUND: Although tetracycline or doxycycline is the drug of choice for the treatment of scrub typhus, they are not recommended for children and pregnant women. Futhermore, the emergence of doxycycline resistant strain of Orientia tustusgamushi has aroused to find new therapeutic drugs. So, this study was aimed to evaluate the clinical efficacy of telithromycin, the first ketolide antibiotic for the treatment of scrub typhus in comparison with doxycycline. MATERIALS AND METHODS: Mild scrub typhus patients who were admitted to two university hospitals located in Incheon city from October 2004 through November 2004 were enrolled. Patients were assigned to telithromcyin (the first day, oral 800 mg every 12 hours and then 800 mg/day) and doxycycline treatment groups (oral 200 mg/day). Time and days to defevescence were analysed to evaluate the efficacy of the two antibiotics. RESULTS: Among a total of fifty patients, twenty six (52.0%) patients were excluded. Twenty four (48.0%) enrolled patients, telithromcyin and doxycycline were administered to thirteen (54.2%) and eleven patients (45.8%), respectively. In telithromycin treatment group, one patient (7.6%) was dropped out due to nausea and diarrhea. In doxycycline group, the mean age was higher (P=0.031) but the duration of fever before admission was shorter (P=0.015) than telithromycin group. There was no treatment failure nor relapse in either treatment groups. The mean time to defevescence was 17.7 hours for telithromycin group and 30.7 hours for doxycycline group (P=0.003). Ten patients (83.3%) in telithromycin group and four patients (36.4%) in doxycycline group became afebrile within the first day (P=0.048). CONCLUSION: Telithromycin has achieved good therapeutic outcome and more rapid response than doxycycline for the treatment of mild to moderate scrup typhus, so it suggests that telithromycin would be an alternative therapeutic agent for scrub typhus.

Seroprevalence of Rickettsia japonica on an Island Where a Korean Patient with Japanese Spotted Fever was First Identified / 감염과화학요법

BACKGROUND: Spotted fever group rickettsiosis occurs worldwide and includes various causative organisms depending on the region and clinical features. In Korea, previous studies have shown that several kinds of spotted fever rickettsiae have been identified in ticks, and in stored sera obtained from febrile patients. Previously, it was difficult to correlate the results of serologic or molecular biologic tests with the clinical or epidemiological features of this disease in humans. In 2004, the first Korean patient with Japanese spotted fever (JSF) was identified on Mueui Island, Incheon, Korea. To estimate the prevalence of JSF and to compare the incidence of JSF with those of other infectious diseases endemic to Korea, we performed a serosurvey of Japanese spotted fever and other rickettsiosis (scrub typhus and murine typhus), hemorrhagic fever with renal syndrome and leptospirosis on the island where the patient had been living. MATERIALS AND METHODS: In October 2004, we performed a seroprevalence survey of Mueui Island where nearly 300 persons resided. There were 91 persons who participated in the survey and answered the questionnaire. The participants included 30 healthy subjects receiving a check up at the Health Promotion Center at Inha University Hospital, and 30 patients with rheumatoid factor as control groups for the serologic tests. RESULTS: Of the 91 residents, only one person showed a positive reaction to R. japonica at a titer of 1:80. IgG antibodies against O. tsutsugamushi were positive at a titer of 1:32 in 3 persons, and those against R. typhi were at 1:32 in 1 person and at 1:64 in 2 persons. Serum IgG antibodies to Hantan virus were positive at a dilution of 1:64 in 2 persons and those to leptospira were negative. All 30 healthy persons and 30 patients with rheumatoid factor in the control group showed negative results in 1:40 diluted sera. CONCLUSION: This study demonstrates that the seroprevalence of R. japonica is not as high in Korea as it is in Japan. Further studies should be performed in a large number of patients, including residents of other islands and the Korean peninsula.

A Preliminary Report on the Clinical Efficacy of Telithromycin for the Treatment of Scrub Typhus / 감염과화학요법

BACKGROUND: Although tetracycline or doxycycline is the drug of choice for the treatment of scrub typhus, they are not recommended for children and pregnant women. Futhermore, the emergence of doxycycline resistant strain of Orientia tustusgamushi has aroused to find new therapeutic drugs. So, this study was aimed to evaluate the clinical efficacy of telithromycin, the first ketolide antibiotic for the treatment of scrub typhus in comparison with doxycycline. MATERIALS AND METHODS: Mild scrub typhus patients who were admitted to two university hospitals located in Incheon city from October 2004 through November 2004 were enrolled. Patients were assigned to telithromcyin (the first day, oral 800 mg every 12 hours and then 800 mg/day) and doxycycline treatment groups (oral 200 mg/day). Time and days to defevescence were analysed to evaluate the efficacy of the two antibiotics. RESULTS: Among a total of fifty patients, twenty six (52.0%) patients were excluded. Twenty four (48.0%) enrolled patients, telithromcyin and doxycycline were administered to thirteen (54.2%) and eleven patients (45.8%), respectively. In telithromycin treatment group, one patient (7.6%) was dropped out due to nausea and diarrhea. In doxycycline group, the mean age was higher (P=0.031) but the duration of fever before admission was shorter (P=0.015) than telithromycin group. There was no treatment failure nor relapse in either treatment groups. The mean time to defevescence was 17.7 hours for telithromycin group and 30.7 hours for doxycycline group (P=0.003). Ten patients (83.3%) in telithromycin group and four patients (36.4%) in doxycycline group became afebrile within the first day (P=0.048). CONCLUSION: Telithromycin has achieved good therapeutic outcome and more rapid response than doxycycline for the treatment of mild to moderate scrup typhus, so it suggests that telithromycin would be an alternative therapeutic agent for scrub typhus.

Detection of Rickettsia prowazekii by quantitative real-time PCR / 中华流行病学杂志

<p><b>OBJECTIVE</b>To develop a quantitative real-time polymerase chain reaction (PCR) for detecting Rickettsia prowazekii.</p><p><b>METHODS</b>Primers and TaqMan-MGB probes designed based on ompB gene of R. prowazekii, were used to develop this method.</p><p><b>RESULTS</b>For the quantitative real-time PCR, the relationship between the values of threshold cycle (Ct) and the DNA copy number was linear (r = 0.999) and the sensitivity was about 100 times higher than that of the nested PCR for detecting the same DNA sample. The results of the genomic DNA samples of other rickettsial and bacterial agents detected by real-time PCR were all negative. DNAs extracted from blood samples of guinea pig infected with R. prowazekii were examined by real-time PCR and the positive results were obtained from some of these samples. However, the results of some samples in nested PCR assay were all negative.</p><p><b>CONCLUSION</b>These results suggested that the real-time PCR was highly specific and sensitive for detection of R. prowazekii that was useful for the detection of tiny DNA of R. prowazekii in blood samples from patients suspected of having epidemic typhus.</p>

Perfil etiológico del síndrome febril en áreas de alto riesgo de transmisión de enfermedades infecciosas de impacto en salud pública en el Perú, 2000-2001 / Etiologic profile of febrile syndrome in areas at a high risk for transmission of infectious diseases with an impact in public health in Peru. 2000-2001

Objetivos: Conocer el perfil etiológico en pacientes con síndrome febril frotis negativo para Bartonella o gota gruesa negativa para malaria de dos zonas piloto (costa norte y selva oriental del Perú). Materiales y métodos: Estudio longitudinal descriptivo realizado entre mayo de 2000 y julio de 2001, en cuatro establecimientos de salud: CS Chiclayito y Salitral en Piura, hospital de Yurimaguas y CS San Juan en Loreto. Fueron incluidos pacientes febriles (entre 5 y 65 años de edad) frotis negativo para Bartonella o gota gruesa negativa para malaria. En las muestras obtenidas se realizó IFI para el diagnóstico de tifus (sólo en Piura), ELISA IgM para leptospirosis y ELISA IgM-IgG para dengue, fiebre amarilla, Mayaro, Oropuche y virus de la encefalitis equina venezolana (EEV). Resultados: Se logróaislamiento viral de dengue en 27 (6,3 por ciento) pacientes, virus de la EEV en cinco y virus del grupo C en un paciente. DEN-2 y DEN-3 fueron identificados en Chiclayito. EEV y virus del grupo C fueron aislados en pacientes de San Juan. Se encontró presencia de IgM anti-dengue en 43 (9,6 por ciento) pacientes y de IgM contra la fiebre amarilla en 21 (4,7 por ciento) pacientes, siendo la mayoría de Yurimaguas. También se encontró IgM contra EEV en siete pacientes, contra Mayaro en uno y contra Oropuche en cuatro. Leptospirosis fue la segunda etiología del síndrome febril (3,8 por ciento); mientras que tifus fue confirmado por IFI en cinco pacientes de Chiclayito. Conclusiones: El estudio de la etiología del síndrome febril ha permitido: conocer la circulación del virus EEV, detectar el ingreso del DEN-3 al país y conocer el componente de arbovirosis en el síndrome febril de la costa norte y la selva en ausencia de actividad epidémica.

Objectives: To know the etiologic profile in patients with febrile syndrome reported as negative for Bartonella infection or with a negative result in thick smears for malaria in two pilot areas (Northern Coast and Eastern Jungle in Peru). Materials and methods: A longitudinal and descriptive study was performed between May 2000 and July 2001 in four health facilities: Chiclayito and Salitral in Piura, Yurimaguas Hospital, and San Juan Health Center in Loreto. Febrile patients between 5 and 65 years old were included with negative smears for Bartonella or negative thick smears for malaria. The following tests were performed in the samples obtained: indirect immunofluorescence for typhus (only in Piura), ELISA IgM for leptospirosis and ELISA IgM-IgG for dengue fever, yellow fever, Mayaro, Oropuche and Venezuelan equine encephalitis (VEE). Results: Isolation of dengue fever virus was achieved in 27 (6,3%) patients, VEE virus was found in five patients, and group C virus was found in one patient. Dengue fever 2 and 3 viruses were identified in Chiclayito. VEE and group C virus were isolated in San Juan patients. Anti-dengue fever IgM was found in 43 (9,6%) patients, and yellow fever IgM was found in 21 (4,7%) patients, most of them from Yurimaguas. Also, VEE IgM was found in seven patients, Mayaro virus IgM was found in one and Oropuche virus IgM was found in four. Leptospirosis was the second most frequent cause of febrile syndrome (3,8%); while typhus was confirmed using indirect immunofluorescence in five Chiclayito patients. Conclusions: Studying the etiology of febrile syndrome allowed us to detect circulation of EEV virus, the presence of dengue fever 3 virus in Peru and also the prevalence of arboviral infections as a cause of febrile syndrome in the Peruvian Northern Coast and Eastern Jungle in the absence of epidemic activity.