Immunoglobulin reactions to Salmonella dublin in serum and milk from 4 groups of lactating cows were measured by an indirect ELISA. The groups consisted of (1) cows that were natural carriers of S dublin in the mammary gland, (2) experimentally infected cows that did not become carriers, (3) cows inoculated with a commercial S dublin bacterin, and (4) cows used as S dublin-negative controls. Milk and serum samples were obtained at monthly intervals. Models for predicting carrier status were developed by use of stepwise logistic regression. Independent variables consisted of serum and milk IgG and IgM titers to S dublin lipopolysaccharide and a ratio of IgG to IgM. The utility of a single sample vs multiple samples obtained at 1-month or 2-month intervals was tested by comparison of goodness-of-fit X2 P values for 8 models predicting carrier status. Immunoglobulin reactions specific to S dublin were a significant predictor of carrier status (P < 0.001). Serum IgG titers specific for S dublin were the most important variable for predicting carrier status. Two serum IgG titers to S dublin obtained 2 months apart was a better predictor of carrier status than measurement of the IgG:IgM ratio from a single serum sample. Immunoglobulin recognizing S dublin epitopes also were detected in milk samples. In milk, performing 2 ELISA 60 days apart to determine IgG and IgM reactions to S dublin appeared to be useful for the prediction of carrier status, but was not as accurate as models for serum immunoglobulin reactions.

Pilus-mediated adherence is a virulence attribute of Moraxella bovis. Several pilus types have been shown to exist among strains of this bacterium, but correlation between pilus type and specific field cases of the disease has not been done. During the summer of 1987, an epizootic of infectious bovine keratoconjunctivitis was reported in 7 Iowa counties. Eight isolates of M bovis were secured from 12 episodes studied. All 8 of the isolates were nearly homogeneous in biochemical properties and had the same plasmid biotype. Pilus typing performed by immunofluorescence and immunogold electron microscopy identified a single new pilus type among 5 of the 8 isolates. This pilus type was identified in field cases that developed within a narrow time frame and over large distances. The implication of these findings is that infectious bovine keratoconjunctivitis epizootics may be associated with emergence of a novel pilus type, and that rapid dissemination over wide distances can occur, presumably by transportation of carrier cattle.

Four shed-lambing operations in western Colorado were monitored during the 1984 spring lambing season to determine the causes and rates of perinatal lamb mortality. The number of lambing ewes per flock ranged from 513 to 1,712, and lambing percentages ranged from 131 to 180%. Overall perinatal lamb mortality ranged from 8.2 to 12.2%. Most lamb deaths occurred during parturition or within 24 hours after parturition. More than 85% of all lamb deaths were in lambs born to ewes having 2 or more lambs. The leading causes of lamb death were starvation, dystocia, stillbirth (unknown cause), and infectious diseases. A wheel model was used to categorize factors causing lamb deaths into 4 groups: physical, social, host, and biological, and to present data on perinatal lamb mortality in a simple visual model. In all flocks, social and biological factors resulted in most of the lamb deaths. On the basis of our findings, we suggest that interventions designed to improve ewe-lamb bonding and to reduce infectious agents and the incidence of prolonged parturition may reduce lamb mortality.

A leishmaniose visceral (LV) está entre as mais importantes doenças transmitidas por vetores que ocorrem no Brasil, principalmente devido ao seu caráter zoonótico. Atualmente, está presente em quase todo o território brasileiro, e seu controle é um desafio tanto para médicos veterinários como para agentes de saúde pública. O agente etiológico da doença é a Leishmania infantum (syn chagasi), e o principal vetor no Brasil é a Lutzomyia longipalpis. De todos os animais identificados como reservatórios da LV, o cão é considerado o reservatório doméstico mais importante. Apesar da doença já ter sido identificada em gatos, o papel epidemiológico desta espécie animal ainda é incerto. O presente artigo apresenta uma breve revisão sobre a situação epidemiológica da doença, a sua forma de transmissão, os aspectos clínicos nos cães e gatos, bem como possíveis fatores de risco associados à ocorrência da doença no Brasil.

O conhecimento das principais causas de óbito em cães e gatos fornece subsídios para o monitoramento, planejamento e avaliação de medidas que visam reduzir o percentual de óbito desses animais em uma dada localidade. O presente trabalho compilou os diagnósticos post-mortem de cães e gatos necropsiados no Laboratório de Patologia Animal – da Universidade Federal do Piauí (UFPI), Estado do Piauí, Brasil, no período de agosto de 2009 a agosto de 2014, estabelecendo a frequência das doenças que culminaram com o óbito dos animais. Nesse período foram necropsiados 361 cães e 86 gatos. Dos cães, 56,7% eram machos e 43,3% fêmeas. Em relação à idade no momento do óbito, 29,4% tinham menos de um ano; 27,7% entre 1,1 a 5 anos; 23,3% de 5,1 a 10 anos e 9,1% acima de 10,1 anos. Em relação aos felinos, 61,6% eram machos e 38,4% eram fêmeas, dos quais 29,1% tinham menos de um ano; 39,5% de 1,1 a 5 anos; 18,6% de 5,1 a 10 anos e 2,3% acima de 10,1 anos. Nos cães as principais causas de óbito foram distúrbios infecciosos (23,8%), doenças degenerativas (14,4%), distúrbios circulatórios (10,2%) e neoplasias 8,6%. Em gatos, os distúrbios infecciosos (18,6%), urinários (15,1%), traumáticos (8,1%) e neoplasias (8,1%) foram as principais causas de morte. Conclui-se que a principal causa de morte, tanto em cães quanto gatos, diagnosticada no setor de Patologia Animal – UFPI foram as doenças infecciosas, estes resultados contribuem para que o clínico dedique maior atenção a essas enfermidades, visando adoção de medidas profiláticas que reduzirão a sua ocorrência nos animais de companhia da região estudada.