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Due to the increasingly restricted use of antimicrobials in animal production systems, the prevention and control of Clostridium perfringens type A- and C-induced diarrhea in piglets should be based on passive immunization via the prepartum vaccination of sows. Given the current obstacles in the production of conventional clostridial vaccines, the use of recombinant proteins has been considered to represent a promising alternative. In the present study, the neutralizing antibody response of immunized sows and their litters to a bivalent vaccine containing the C. perfringens recombinant toxoids alpha (rTA) and beta (rTB) produced in Escherichia coli was assessed. Rabbits (n=8) and pregnant sows (n=7) were immunized with 200μg of each recombinant antigen using Al(OH)3 as adjuvant. The alpha and beta antitoxin titer detected in the rabbits' serum pool was 9.6 and 20.4IU/mL, respectively. The mean alpha and beta antitoxin titers in the sows' sera were 6.0±0.9IU/mL and 14.5±2.2IU/mL, and the corresponding individual coefficients of variation (CV) were 16.04% and 14.91%, respectively. The mean alpha and beta antitoxin titers in the litters' serum pools were 4.2±0.4IU/mL and 10.9±1.7IU/mL, and the CV between litters was 9.23% and 9.85%, respectively. The results showed that the rTA and rTB proteins produced and tested in the present study induced an immune response and can be regarded as candidates for the development of a commercial vaccine against C. perfringens type A- and C-induced diarrhea in pigs.

ResumoO presente trabalho tem como objetivo descrever um surto de botulismo em aves domésticas (Gallus gallus domesticus), ocorrido na cidade de Pancas, estado do Espírito Santo, Brasil. As aves eram oriundas de uma propriedade de subsistência com aproximadamente 150 frangos domésticos. O proprietário relatou encontrar algumas aves caídas no chão e outras apresentando dificuldade de locomoção. Dez animais em estado agônico foram eutanasiados, submetidos à necropsia e coleta de soro sanguíneo. Em 72 horas após o início dos sinais clínicos, 144 (96%) animais da criação já haviam vindo a óbito. Nenhuma alteração post-mortem foi encontrada durante a necropsia. Foi possível detectar a toxina botulínica tipo C por soroneutralização em camundongos no soro dos animais eutanasiados. A observação da sintomatologia clínica, ausência de lesões à necropsia e o resultado da soroneutralização permitem confirmar o diagnóstico de botulismo por Clostridium botulinum tipo C. Palavras-chave: Clostridium botulinum, paralisia flácida, aves, frangos AbstractThis work aims to describe an outbreak of botulism in poultry (Gallus gallus domesticus), in Pancas City, Espírito Santo State, Brazil. The birds were derived from a subsistence property with approximately 150 domestic fowls. The owner reported finding some birds lying on the floor and others exhibiting limited mobility. Ten animals in agony were euthanized, necropsied and had their blood serum collected. About 72 hours after the onset of clinical signs, 144 (96%) animals of the creation had already died. No postmortem changes were found at necropsies. Clostridium botulinum type C toxins were detected in the sera of euthanized chickens by mice neutralization tests. The observation of clinical signs, absence of post-mortem lesions and the result of mouse neutralization tests confirmed the diagnosis of botulism caused by C. botulinum type C. Unfortunately, the source of toxins was not found.

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RESUMO O objetivo do presente trabalho foi padronizar um modelo de infecção por Clostridium diffi cile (ICD) em hamsters sírios (Mesocricetus auratus). Para seleção dos isolados capazes