Avaliação de um controle estratégico da artrite encefalite caprina em rebanho caprino leiteiro / Evaluation of strategic control of caprine arthritis- encephalitis in dairy herd goats

O objetivo deste trabalho foi avaliar a utilização periódica de testes de diagnóstico mais sensíveis aliados às práticas de manejo, visando ao controle eficaz da artrite encefalite caprina (CAE). Foram realizadas oito coletas de sangue em matrizes e reprodutores. Da primeira à sétima análise, as coletas foram quadrimestrais, utilizando-se os testes de imunodifusão em gel de agarose (IDGA), ensaio imunoenzimático indireto (ELISA-i) e Western Blot (WB). A oitava coleta aconteceu seis meses após a sétima, utilizando-se o WB e a reação em cadeia de polimerase (PCR). A prevalência da CAE foi de 6,8%, 14,9% e 39,2% no IDGA, ELISA-i e WB, respectivamente. Na última análise, foram detectados 0,9% de animais positivos pelo WB e 10,8% pela PCR. Apesar de não erradicarem a CAE, as medidas adotadas, aliadas à utilização periódica dos testes sorológicos e à combinação com a PCR, foram importantes para reduzir significativamente os animais soropositivos no rebanho.(AU)

The aim of this study was to evaluate the periodic use of more sensitive diagnostic tests associated to management practices for the effective control of caprine arthritis-encephalitis (CAE). We carried out eight blood samples in does and bucks. From the first to the seventh analysis, the samples were quarterly, using Agarose Gel Immunodiffusion (AGID), Enzyme linked immunosorbent assay (i-ELISA) and Western Blot (WB) tests. The eighth collection was made six months after the seventh, using the WB and Polymerase Chain Reaction (PCR). The prevalence of CAE was 6.8%, 14.9% and 39.2% in the AGID, i-ELISA and WB respectively. The last analysis detected 0.9% of animals positive by WB and 10.8% by PCR. Although they do not eradicate CAE, steps taken together with the periodic use of serological tests and the combination with PCR were important to significantly reduce positive animals in the herd.(AU)

Uso da técnica de swim-up para a remoção do Vírus da Artrite Encefalite Caprina do sêmen de reprodutores infectados / Use of swim-up technique for removal of the Caprine Arthritis Encephalitis Virus in the semen of infect bucks

Neste estudo, 67 ejaculados foram avaliados, antes e depois da técnica de swim-up, em relação à qualidade seminal e à presença do CAEV. Das 67 amostras testadas por PCRn, antes do swim-up, 47 (70,15%) foram positivas para o DNA pró-viral. No entanto, quatro amostras adicionais foram positivas ao RT-nested PCR após o swim-up, o que permite dizer que, pelo menos, 76,12% (51/67) delas estavam infectadas antes da lavagem. Todavia, em 23,88% (16/67) das amostras não foi detectada a presença do CAEV. Após a aplicação da técnica de swim-up, constatou-se, pela PCRn e RT-nested PCR, que houve uma redução significativa (χ²= 9,078; p<0,001) da presença do CAEV nas amostras seminais, pois 28 de 51 amostras positivas resultaram livres do vírus (54,90%), tanto para DNA pró-viral quanto para o vírus livre. Em relação à motilidade individual progressiva (MIP) e vigor espermático obtidos antes e depois da técnica de swim-up, observou-se uma diminuição significativa em suas médias, sendo o MIP de 86,42% para 71,49%, já o vigor espermático de 4,16 para 3,93. Conclui-se que a eliminação do CAEV no sêmen é de caráter intermitente, e que a associação da PCRn e RT-nested PCR é uma opção segura para a certificação sanitária individual das amostras seminais quanto à presença ou ausência do CAEV. Finalmente, a técnica de swim-up promove uma redução na infectividade de amostras de sêmen contaminadas, e, além disso, é possível promover a recuperação de espermatozoides viáveis.

In this study, 67 ejaculates were assessed before and after the swim-up technique in relation to semen quality and presence of CAEV. Of the 67 samples tested by Nested PCR, before swim-up 47 (70.15%) were positive for viral DNA. Furthermore, four additional samples were positive for RT-nested PCR after swim-up, which allows us to affirm that at least 76.12% (51/67) were infected before washing. However, 23.88% (16/67) of the samples did not detect the presence of CAEV. After application of the swim-up technique it was found, by Nested PCR and RT-nested PCR, that there was a significant decrease (χ² = 9.078, p <0.001) in the presence of CAEV in semen samples, once 28 of 51 positive samples were free from the virus (54.90%) for both proviral DNA and the free form of the virus. Regarding individual progressive motility (IPM) and spermatic vigor obtained before and after the swim-up technique, a significant decrease was observed in the average, being 86.42% of the IPM to 71.49% and the spermatic vigor from 4.16 for the 3.93. It is concluded that the removal of CAEV in semen has an intermittent character, and the combination of PCR and RT-nested PCR is a safe option for health certification of individual semen samples for the presence or absence of CAEV. Finally, the swim-up technique promotes a reduction in the infectivity of contaminated semen samples, and it is possible to promote the recovery of high individual progressive motility sperm and sperm vigor.

Uso da técnica de swim-up para a remoção do Vírus da Artrite Encefalite Caprina do sêmen de reprodutores infectados / Use of swim-up technique for removal of the Caprine Arthritis Encephalitis Virus in the semen of infect bucks

Neste estudo, 67 ejaculados foram avaliados, antes e depois da técnica de swim-up, em relação à qualidade seminal e à presença do CAEV. Das 67 amostras testadas por PCRn, antes do swim-up, 47 (70,15%) foram positivas para o DNA pró-viral. No entanto, quatro amostras adicionais foram positivas ao RT-nested PCR após o swim-up, o que permite dizer que, pelo menos, 76,12% (51/67) delas estavam infectadas antes da lavagem. Todavia, em 23,88% (16/67) das amostras não foi detectada a presença do CAEV. Após a aplicação da técnica de swim-up, constatou-se, pela PCRn e RT-nested PCR, que houve uma redução significativa (²= 9,078, p<0,001) da presença do CAEV nas amostras seminais, pois 28 de 51 amostras positivas resultaram livres do vírus (54,90%), tanto para DNA pró-viral quanto para o vírus livre. Em relação à motilidade individual progressiva (MIP) e vigor espermático obtidos antes e depois da técnica de swim-up, observou-se uma diminuição significativa em suas médias, sendo o MIP de 86,42% para 71,49%, já o vigor espermático de 4,16 para 3,93. Conclui-se que a eliminação do CAEV no sêmen é de caráter intermitente, e que a associação da PCRn e RT-nested PCR é uma opção segura para a certificação sanitária individual das amostras seminais quanto à presença ou ausência do CAEV. Finalmente, a técnica de swim-up promove uma redução na infectividade de amostras de sêmen contaminadas, e, além disso, é possível promover a recuperação de espermatozoides viáveis.

In this study, 67 ejaculates were assessed before and after the swim-up technique in relation to semen quality and presence of CAEV. Of the 67 samples tested by Nested PCR, before swim-up 47 (70.15%) were positive for viral DNA. Furthermore, four additional samples were positive for RT-nested PCR after swim-up, which allows us to affirm that at least 76.12% (51/67) were infected before washing. However, 23.88% (16/67) of the samples did not detect the presence of CAEV. After application of the swim-up technique it was found, by Nested PCR and RT-nested PCR, that there was a significant decrease (² = 9.078, p <0.001) in the presence of CAEV in semen samples, once 28 of 51 positive samples were free from the virus (54.90%) for both proviral DNA and the free form of the virus. Regarding individual progressive motility (IPM) and spermatic vigor obtained before and after the swim-up technique, a significant decrease was observed in the average, being 86.42% of the IPM to 71.49% and the spermatic vigor from 4.16 for the 3.93. It is concluded that the removal of CAEV in semen has an intermittent character, and the combination of PCR and RT-nested PCR is a safe option for health certification of individual semen samples for the presence or absence of CAEV. Finally, the swim-up technique promotes a reduction in the infectivity of contaminated semen samples, and it is possible to promote the recovery of high individual progressive motility sperm and sperm vigor.

Response of resistant and susceptible Brazilian Somalis crossbreed sheep naturally infected by Haemonchus contortus.

This study was carried out to evaluate the performance of Brazilian Somalis sheep to natural infections by gastrointestinal nematodes. During 98 days, 75 weaned sheep, initially 3-4 months old, were kept on the same pasture and evaluated. Fecal and blood samples were collected for parasitological and hematological exams. After this period, the eight most resistant and the eight most susceptible animals were selected based on their individual averages of nematode fecal egg counts and were slaughtered for worm burden determination and nematodes identification. Abomasum and abomasum lymph nodes were also recovered for gene expression analysis. The animals selected as resistant had lower fecal egg counts during experimental period and smaller worm burdens than the susceptible ones (P < 0.05). The genus Haemonchus, followed by Trischostrongylus and Oesophagostomum, were identified in composite cultures. Haemonchus contortus was the specie identified in the abomasum. Packed cell volume and total plasma protein means were higher in the resistant group (27.2% and 6.1 g/dL) than in the susceptible one (22.5% and 5.3 g/dL), respectively. Regarding cytokine gene expression, IL-4 (P < 0.05) was up-regulated in the abomasum of resistant animals and TNF-α (P < 0.03) and IFN-γ (P < 0.03) in susceptible ones. In abomasum lymph nodes, IL-4 (P < 0.04) and IL-13 (P < 0.05) were up-regulated in the resistant animals and IFN-γ in the susceptible one (P < 0.01). This work provides further evidence that, within a given animal breed, individuals have different responses when infected by gastrointestinal nematodes. Resistant animals who responded more quickly and efficiently to these infections activated a TH2-type response.

Prenatal treatment with picrotoxin promotes heterotypical sexual behavioral and neurochemical changes in male rat offspring.

The effects of maternal prenatal exposure to picrotoxin (0.75 mg/kg S.C. days 16-19 of pregnancy) in male rat offspring were observed. Adult sexually experienced and inexperienced animals were evaluated for heterotypical sexual behavior, as well as the testosterone plasma levels and striatal neurotransmitters. In relation to sexual behavior and analysis of sexual organs, the results showed that animals treated with picrotoxin exhibited a more intense reproductive behavior, and this could be expressed by a significant decrease in the number of mounts and intromissions and increase in the numbers of ejaculation, showed that these males are most motivate for sexual behavior. Testosterone levels as well as weight for sexual organs did not differ from control group. The neurochemical analysis showed that picrotoxin did not alter DA, 5-HT, 5-HIAA and GABA in animals. The DOPAC/DA and HVA/DA relation showed that the treatment increased the DA system activity in animals sexually experienced, as well as promote a decrease in 5-HT/5-HIAA relation, that is known was an inhibitory neurotransmitter system, blockade a male sexual behavior. There are no alterations observed in GABA levels. It's could be explained by suggests that picrotoxin modification DA system activity through GABAergic system, permitting that DA system to be freely active and facilitate the heterotypical behavior of male rats. These results show that the maternal prenatal exposure to picrotoxin produced changes in the neurochemical and sexual behavior of the adult male rats. Also previous heterotypical experience leads to changes in biogenic amine concentrations in these animals.

Reproductive experience modulates dopamine-related behavioral responses.

Reproductive experience (RE), i.e., mating, pregnancy, parturition and lactation, has long-term physiological effects. It reduces the basal levels of circulating prolactin in parous women, decreases the intensity of nocturnal and diurnal prolactin surges in multigravid rats during early pregnancy, as well as the hormonal and neurochemical responses to the dopamine receptor antagonists metoclopramide and haloperidol. In the present study, we evaluated the possible influences of RE on some dopaminergic-related behaviors: (1) acute responses to a new environment represented by an open-field arena plus injection stress; (2) modulation of behavior after a short-term withdrawal subsequent to 7 days amphetamine (AMPH) pretreatment; (3) stereotypy elicited by AMPH and apomorphine (APO); and (4) APO-induced hypothermia. In the 3-min open-field test, there was a decrease in locomotor activity as a function of RE. Behavioral depression was mild and AMPH pretreatment revealed RE alterations. APO-induced stereotyped behavior was slightly more intense in primiparous animals, although no significant differences were found in AMPH-induced stereotyped behavior. No differences were observed between intact and ovariectomized primiparous and nulliparous animals in APO-induced hypothermia. Our data suggest that RE modifies some DA-related behavioral responses. The physiological relevance of the phenomenon is discussed.

Starting to think digitally: evaluation of web browser-based presentation of images at a Rad Path conference in a traditional film-based environment.

Images have traditionally been projected from film to a large-screen television at the weekly Rad Path conference at University of Medicine and Dentistry of New Jersey-New Jersey Medical School. An alternative system was developed to digitally transfer computed tomography (CT) scans and magnetic resonance images (MRI) into a standard PC format, and present them at the conference in a hypertext markup language (HTML) document via a laptop computer and liquid crystal display (LCD) projector. Resident and attending physicians were given a questionnaire about the differences between the two modes of presentation. Their responses are presented here.

Reproductive experience increases striatal and hypothalamic dopamine levels in pregnant rats.

The effects of parity on the dopaminergic function of rats were studied. Striatal and hypothalamic levels of dopamine (DA), 3,4-dihydroxyphenylacetic acid (DOPAC), homovanillic acid (HVA), norepinephrine (NE), serotonin (5-HT), and 5-hydroxyindoleacetic acid (5-HIAA) as well as serum prolactin (PRL) levels of 7-days primigravid and multigravid rats were compared. Brains and trunk blood were collected from 1200-1400 h on day 7 of pregnancy and assayed for monoamines and their metabolites, and prolactin, respectively. Multigravid rats showed a significant increase in striatal and hypothalamic dopamine levels. A tendency to increase in striatal DOPAC levels was also observed in multigravid rats. Levels of other neuro-transmitters and metabolites were not statistically different. Haloperidol (1 mg/kg) treatment induced a significant increase in multigravid 5-HT striatal levels. There was no statistical difference among primigravid and multigravid serum PRL levels after either saline or haloperidol treatment. These data suggest that prior parity produces a shift in dopaminergic activity in multigravid rats.

Pulmonary manifestations of cryptococcosis in patients with AIDS: CT features.

The computed tomographic (CT) scans and chest radiographs of 10 patients with AIDS and proven pulmonary cryptococcal infections were reviewed. In seven patients (70%), CT demonstrated pulmonary opacities that ranged in appearance from a perihilar interstitial pattern to an area of dense alveolar consolidation. Corresponding chest radiographs were less accurate in detecting interstitial opacities (2 of 5 patients, 40%) than the alveolar opacities (4 of 5 patients, 80%). Pulmonary nodules were identified in three patients (30%) by CT but were identifiable on the chest radiograph in only one patient (10%). The chest radiograph suggested hilar adenopathy in three patients although CT confirmed hilar adenopathy in only one patient. In one patient, a small pleural effusion, not appreciated on the chest radiograph, was detected by CT. CT may add additional information in the diagnosis of pulmonary Cryptococcus neoformans.

Pattern recognition of the pulmonary manifestations of AIDS on CT scans.

More than 50% of patients with acquired immunodeficiency syndrome (AIDS) develop pulmonary disease during the course of their illness. The authors reviewed 96 computed tomographic (CT) scans of patients with AIDS in an attempt to describe disease entities by the patterns seen on the scans. Such patterns included isolated ground-glass and interstitial infiltrates, which are suggestive of Pneumocystis carinii pneumonia (PCP). If pleural effusions or parenchymal nodules are also present, AIDS-related lymphoma (ARL) or Kaposi sarcoma (KS) is more likely. Although diffuse alveolar infiltrates are most commonly present in PCP, a segmental alveolar infiltrate is suggestive of a bacterial pneumonia, especially when associated with cavitation or ipsilateral pleural effusion. Well-defined nodules are typical for ARL, whereas ill-defined nodules are more commonly suggestive of KS. Accompanying adenopathy or effusion with nodules further suggests ARL. Different combinations of parenchymal, nodular, and pleural abnormalities may be suggestive for additional diagnoses, including Mycobacterium tuberculosis, M avium-intracellulare, and Cryptococcus neoformans infections and human immunodeficiency virus adenopathy. The authors believe that a specific pattern of involvement can help suggest a likely diagnosis in many instances.

Malignant tumors invading chest wall: treatment with CT-directed implantation of radioactive seeds.

Computed tomography (CT) was used to direct permanent implantation of radioactive iodine-125 seeds in two patients with unresectable lung cancer and in one with recurrent breast cancer invading the chest wall. An average of 60 seeds were implanted, with a mean total radioactivity of 35.6 mCi (1,317 MBq). Tumor coverage was adequate and pain relief was good in all patients. One patient had histologically documented complete response and another had CT-documented partial response.

The functional significance of calcification of coronary arteries as detected on CT.

We evaluated the coronary arteries on computed tomography (CT) scans of the chest and on coronary angiograms of 27 patients who underwent both studies. We related the presence or absence of coronary artery calcification on CT to percentage stenosis on angiogram. For the left anterior descending artery (LAD), the likelihood of calcification rose proportionately with degree of stenosis; this was less true for the circumflex, and not true for the right coronary artery (RCA). The sensitivity of CT in detecting coronary artery calcification in patients with angiographic criteria of significant coronary artery disease (CAD) was 78% for the LAD, 63% for the circumflex, and 16% for the RCA. Specificities were 78%, 80%, and 100%, and positive predictive values were 88%, 83%, and 100%. The high positive predictive values suggest that coronary artery calcification diagnosed by chest CT has a high correlation with clinically significant CAD. Therefore, when we detect such calcification in a patient without documented heart disease, we suggest that a cardiac workup is indicated.

Radiographic manifestations of primary bronchogenic carcinoma.

Carcinoma of the lung continues to account for more cancer-related deaths than any other neoplasm in the United States. The World Health Organization recognizes four main classifications of cell type. Squamous cell carcinoma is most often a central lesion that locally invades the hilus and mediastinum. Because of its localization within the chest, it shows the best survival statistics. Adenocarcinoma is probably the most common of the four cell types. It tends to present as a peripheral mass. Hilar, mediastinal, and extrathoracic metastases occur early in its course. Its 5-year survival rate is worse than that for squamous cell carcinoma. Alveolar cell carcinoma is considered by most to be a subtype of adenocarcinoma but demonstrates much better survival figures. Most typically it presents as a nodule, but is more often thought of as a diffuse or localized alveolar infiltrate. Large cell carcinoma resembles adenocarcinoma in that it is a peripheral mass, but often larger in size. Metastases are less frequent in large cell carcinoma than in adenocarcinoma. Large cell carcinoma demonstrates better survival figures than does adenocarcinoma. Small cell carcinoma is the most aggressive of the four cell types, having the worst prognosis. The classic presentation is the detection of hilar and mediastinal metastases while the primary tumor remains occult. Grossly enlarged hilar and mediastinal lymph nodes can be seen easily on chest radiograph and CT scan.

Hilar and mediastinal adenopathy in sarcoidosis as detected by computed tomography.

CT of the chest was performed in 25 patients with chest radiographs suspicious for hilar or mediastinal adenopathy, who subsequently proved to have sarcoidosis. In each case, CT detected more extensive adenopathy than suspected on chest radiographs. Adenopathy greater than 1.0 cm was present in the right paratracheal and pretracheal regions in all cases. Adenopathy was also frequently seen in the hilar (92%), anteroposterior window (88%), subcarinal (64%), anterior mediastinal (48%), and posterior mediastinal (16%) lymph node groups. The adenopathy occurred in multiple and varying combinations without a consistent identifiable pattern suggestive of sarcoidosis. It is concluded that while CT detects adenopathy more consistently, it does not offer a clear advantage over chest radiography in confirming a diagnosis of mediastinal and hilar involvement by sarcoidosis.

Varied appearance of AIDS-related lymphoma in the chest.

The authors reviewed all cases of acquired immunodeficiency syndrome (AIDS)-related lymphoma (ARL) seen at their institution between January 1982 and September 1988 to determine the frequency and appearance of ARL in the chest. Of 35 patients with ARL, 11 (31%) had biopsy-proved thoracic involvement. This frequency is significantly greater than that previously reported. The radiologic appearance of the thoracic involvement varied. Pleural effusion, interstitial and alveolar lung disease, nodules, and, infrequently, hilar and mediastinal adenopathy were observed. ARL of the chest was most commonly extranodal. Pleural effusion and lung disease were the two most common manifestations of ARL on chest radiographs and computed tomographic scans. The authors recommend that clinicians treating patients with suspected or known AIDS consider ARL when a pleural effusion or a noninfective interstitial or alveolar process is present.

The value of a structured course for an elective in radiology for senior medical students.

The authors recently revised the elective course for senior medical students at Northwestern University Medical School. The new course is well structured with clearly stated objectives, self-instruction seminars, specialized teaching conferences conducted by attendings and residents, student presentations, and a final examination. The enrollment in the course has increased steadily, especially among students not planning a career in radiology. Student surveys obtained immediately after completion of the new course demonstrated a clear positive response despite the increased workload. Follow-up surveys also showed a greater comfort level and expertise with radiographic images in students who participated in the more structured course. Final grade distribution was based on multiple factors and resulted in 16% honors reduced from previous honors rate of 24%.

Complexities of establishing an early diagnosis of allergic bronchopulmonary aspergillosis in children.

The problem of attempting to diagnose allergic bronchopulmonary aspergillosis (ABPA) in children at an early age, prior to the development of undesirable sequelae, such as bronchiectasis, is reviewed. Two cases of ABPA with onset under the age of ten are presented as illustrations of the complexities of securing an early diagnosis of ABPA. ABPA is not infrequent in children, with children under ten representing an estimated 9% to 10% of patients with the disorder. A high index of suspicion and persistence are important in establishing the diagnosis. ABPA may be identified in patients with detectable central bronchiectasis (ABPA-CB) or in patients seropositive (ABPA-S) who do not yet have bronchiectasis. Some complexities in making an early diagnosis of ABPA include: 1) insensitivity of CT scans in detecting central bronchiectasis, 2) lack of current chest radiographic infiltrates, 3) lack of peripheral blood eosinophilia and precipitins to A. fumigatus and 4) weakly reactive immediate skin test to Aspergillus.