ABSTRACT
Here we investigate the extent to which different Aspergillus species release galactomannan (GM) in vitro. Marked variability was observed in GM reactivity between and within Aspergillus species, with A. terreus strains showing the highest GM indexes. The in vivo significance of these findings remains to be determined.
O estudo objetivou investigar a liberação in vitro de galactomanana (GM) em distintas espécies patogênicas de fungos do gênero Aspergillus. Grande variabilidade foi detectada tanto intra quanto inter espécies, sendo as cepas da espécie A. terreus relacionadas aos maiores índices de GM detectados. O significado in vivo destes achados permanece em aberto, porém merece investigação.
Subject(s)
Antigens, Fungal/analysis , Aspergillus/chemistry , Mannans/analysis , Aspergillus/classification , Immunoenzyme Techniques , Species SpecificityABSTRACT
O aumento da incidência de germes multirresistentes (GMR) e a falta de opções terapêuticas a curto ou médio prazo representam um grande desafio aos hospitais no que se refere à prevenção da disseminação destas bactérias. Para a prevenção da transmissão de agentes infecciosos no ambiente hospitalar é preconizada a adoção de medidas de bloqueio epidemiológico. Essas políticas de bloqueio devem estar claramente estabelecidas, divulgadas aos profissionais de saúde e adotadas por estes a fim de minimizar a incidência de GMR. Revisamos aqui a política de prevenção da disseminação de germes multirresistentes no Hospital de Clínicas de Porto Alegre.
The increasing incidence of multidrug-resistant organisms (MDROs) and the lack of therapeutic options in the short and medium term pose a major challenge to hospitals with regard to preventing the spread of these bacteria. Infection control measures are recommended to prevent transmission of infectious agents in hospital settings. These infection control policies should be clearly established and disseminated among health professionals in order to minimize the incidence of MDROs. We reviewed a hospital policy for prevention of transmission of MDROs at Hospital de Clínicas de Porto Alegre, southern Brazil.
Subject(s)
Humans , Bacterial Infections/prevention & control , Cross Infection/prevention & control , Drug Resistance, Multiple, Bacterial , Infection Control/methods , Acinetobacter , Clostridioides difficile , Enterococcus , Gram-Negative Bacterial Infections/prevention & control , Gram-Positive Bacterial Infections/prevention & control , Methicillin-Resistant Staphylococcus aureus , Sentinel SurveillanceABSTRACT
Very limited data are available in the literature to elucidate the aetiology of invasive mould infections in Latin America. Here we report that Aspergillus species caused only half of such cases in a cohort study conducted over 21 months in a university hospital in Porto Alegre, Southern Brazil. Fusarium spp. were the second most prevalent moulds (20.7 percent), followed by Zygomycetes (13.8 percent). The importance of obtaining local epidemiological data for adequately guiding empirical antifungal therapy is reinforced.
Subject(s)
Adolescent , Adult , Aged, 80 and over , Female , Humans , Male , Middle Aged , Young Adult , Fungi/classification , Mycoses/microbiology , Antifungal Agents/therapeutic use , Brazil , Cohort Studies , Fungi/isolation & purification , Hospitals, University , Itraconazole/therapeutic use , Mycoses/drug therapy , Mycoses/prevention & control , Retrospective Studies , Young AdultABSTRACT
Piperacillin-tazobactam is a broad spectrum antimicrobial agent that can cause false-positive results in the commercial Platelia Aspergillus EIA test. So far, no study has been performed in Latin America to evaluate the clinical implication of this finding. Here we studied the potential for galactomannan detection in piperacillin-tazobactam batches commercialized in the Brazilian market. Five batches from distinct laboratories were tested in duplicate in the Platelia Aspergillus EIA according to the manufacturer's instructions. Only one drug showed crossreaction at a cut-off of 0.5. Human serum was spiked with this particular drug aiming to mimic achievable piperacillin-tazobactam concentrations in the serum. Results were all negative for galactomannan detection, even at high drug concentrations. Results from this pilot study suggest that piperacillin-tazobactam might not be a clinically significant cause of false-positive results in the Platelia Aspergillus EIA test in Brazil.
Subject(s)
Anti-Bacterial Agents/chemistry , Aspergillus/immunology , Immunoenzyme Techniques , Mannans/analysis , False Positive Reactions , Penicillanic Acid/analogs & derivatives , Penicillanic Acid/chemistry , Piperacillin/chemistryABSTRACT
FUNDAMENTOS- As espécies de dermatófitos podem variar de uma região para outra, tendo esse fato importância epidemiológica e terapêutica. OBJETIVO- Descrever a freqüência dos dermatófitos nos exames micológicos em pacientes ambulatoriais do Hospital de Clínicas de Porto Alegre (HCPA). MÉTODOS - Foi realizada análise retrospectiva dos exames micológicos realizados em pacientes ambulatoriais do Serviço de Dermatologia do Hospital de Clínicas de Porto Alegre (HCPA) durante o período de agosto de 1998 a fevereiro de 2006. Os dados foram comparados com os de trabalhos anteriores locais e de outras cidades do Brasil utilizando o teste do qui-quadrado. RESULTADOS - Das 5.077 amostras coletadas, 2.033 (40,0 por cento) foram positivas para dermatófitos, sendo entre os dermatófitos o Trichophyton rubrum a espécie mais isolada (62,4 por cento), seguido de T. mentagrophytes (18,2 por cento), Microsporum canis (5,7 por cento), Epidermophyton floccosum (2,0 por cento), M. gypseum (1,4 por cento) e T.tonsurans (0,3 por cento). CONCLUSÕES - Não houve variação significativa na epidemiologia dos dermatófitos nos últimos sete anos na cidade de Porto Alegre (p>0,05). Entretanto, o estudo evidencia diferenças na microbiota de Porto Alegre, comparada à de alguns outros centros urbanos do país (p<0,001). Foi observada menor ocorrência de T. tonsurans e M. canis em relação a São Paulo; ao contrário do T. mentagrophytes, que é quase três vezes mais freqüente em Porto Alegre.
BACKGROUND - Dermatophyte species vary in different regions and this fact has therapeutical and epidemiological importance. OBJECTIVE - To determine the frequency and the species of dermato phytes in mycological examinations of patients seen at the outpatients' clinic, Department of Dermatology, Hospital de Clínicas de Porto Alegre. METHODS - A retrospective analysis of mycological examinations performed in outpatients from August 1998 to February 2006. The data were compared to the results of previous studies conducted locally and in other Brazilian cities by means of chi-square test. RESULTS - Out of 5077 samples collected, 2033 (40.0 percent) were positive for dermathophytes. Trichophyton rubrum species more frequently isolated (62.4 percent), followed by T. mentagrophytes (18.2 percent), Microsporum canis (5.7 percent), Epidermophyton floccosum (2.0 percent), Microsporum gypseum (1.4 percent) and T. tonsurans (0.3 percent). CONCLUSION - No significant variation was observed in epidemiological data on dermatophytes in the last seven years in Porto Alegre (p>0.05). However, the study showed differences in the microbiota of Porto Alegre, compared to other Brazilian urban centers (p<0.001). T. tonsurans and M. canis were less frequent than in São Paulo, unlike T. mentagrophytes, which is occurs three times more often in Porto Alegre than in São Paulo.
ABSTRACT
Bloodstream infections caused by yeast, Candida spp, are quite important clinically and epidemiologically due to a high mortality rate and an increasing number of non-albicans species with a more resistant (differentiated susceptibility) profile. We examined species prevalence and susceptibility profile for fluconazole and the risk for nosocomial infections by Candida spp at the Hospital de Clínicas de Porto Alegre, a general tertiary care hospital in southern Brazilian, through a retrospective study, beginning with positive cultures of hospitalized patients. The distribution by species in 131 documented episodes was as follows: Candida albicans (45 percent), C. parapsilosis (24.4 percent), C. tropicalis (15.3 percent), C. glabrata (6.9 percent), C. krusei (4.6 percent) and 3.8 percent other species (C. pelicullosa, C. guilliermondii, C. lusitaniae and C. kefyr). The vast majority of samples (121- 92.4 percent) were susceptible to fluconazole; the resistant or dose-dependent sensitive samples included only C. krusei and C. glabrata. Blood diseases (leukemia, lymphoma), or neoplasias (solid tumors), were found in 35.0 percent of the candidemia episodes. We noted the previous use of antibiotics in 128 (97.7 percent) patients, with 79.7 percent using three or more antibiotics before the candidemia episode. Other risk factors included a central venous catheter in 94 (71.8 percent) and abdominal surgery in 32 (24.4 percent) patients. The overall mortality rate was 51.9 percent, which varied according to the underlying disease. We found that C. albicans was the most prevalent species, although the non-albicans species predominated. However, in vitro resistance to fluconazole was detected only among the species (C. glabrata and C. krusei) that tend to be resistant to the azolic compounds. Previous use of antibiotic and the use of a central venous catheter were the main risk factors among patients with candidemia.