RESUMODeterminou-se, por meio de um sistema de monitoramento de suínos em fase de crescimento e em matadouro, a presença de patologias como indicadoras de problemas na população de referência. O estudo foi realizado em uma criação intensiva de ciclo completo, durante nove semanas. Foram determinadas as prevalências dos diagnósticos clínico-patológicos obtidos durante um período de nove semanas. Utilizaram-se cinco grupos de 43 leitões, com pesos de até 19kg, considerados de baixa performance. Estimaram-se, por intervalos de confiança de 95%, as prevalências acumuladas em cada monitoramento. Obteve-se correlação de 0,99 (P<0,0001) entre as prevalências anuais com as nove semanas de estudo, mostrando correspondência com o achado em matadouro. Amostras em semanas alternadas de três grupos de 43 animais são bons indicadores das patologias que afetam os suínos em crescimento, mesmo aquelas de baixa freqüência ou muito letais.Palavras chave: suíno, matadouro, prevalência, diagnóstico clínico-patológico 43, 86, 129, P<0.0001) Ulvesaeter, 1979;Morrison et. al., 1985). A ABSTRACT

Monitoramento da presença de

Because of the lack of information about both the genetic characteristics of Mycoplasma hyopneumoniae commercial vaccines and their relationship with field strains, the authors attempted to identify genetic subtypes of some M hyopneumoniae bacterins, and to compare them with M. hyopneumoniae field strains. Six commercial M hyopneumoniae bacterins and 28 bronchoalveolar lavages from pigs at slaughter from three herds were analysed by Multiple-Locus Variable number tandem repeat Analysis (MLVA) on p146R1, p146R3, H4, H5 and p95 loci. The results obtained showed the presence of more than one M hyopneumoniae genotype in some pigs and also in one of the bacterins analysed. It is also worth noting that MLVA typing allowed the distinction among circulating field strains and also when comparing them with vaccine strains, which, knowing the relatedness among them, could be useful in the research of the efficacy of the vaccines.

No abstract

The importance of pork in the transmission of Salmonella spp. to humans has led to the development of control programmes worldwide. For this, knowledge on the epidemiology of the infection in the production system is fundamental to the efficacy of the regulations. Our objective was to determine the prevalence and spatial distribution of Salmonella-infected farms in the central region of Argentina, and to identify the predominant serotypes and epidemiological factors associated with an increased risk of infection. Salmonella was isolated from 22 of 52 sampled farms, for a farm prevalence of 42·3% (95% confidence interval 28·4-56·1). The most frequent serotypes isolated were S. Typhimurium and S. Derby, which have often been considered of public health concern in the region. Limited evidences of global and local clustering in the region under study were found, and the type of feed and presence of diarrhoeic pigs were significantly associated with having Salmonella shedders in the farm. This highlights the need to evaluate microbiological controls at the farm level, and demonstrates the usefulness of the spatial tools to identify areas of greatest risk when processing pork at slaughterhouse, which could contribute to increasing the food safety of pork products.