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INTRODUCTION: (MS) is a chicken pathogen of major economic importance. MATERIAL AND METHODS: gene. RESULTS: gene showed nine genotypes (A-I), the most frequently occurring being F and C. Pathogenic Polish MS field isolates (n = 27) collected from chickens with clinical signs of infection were grouped for their characteristic symptoms: respiratory for genotypes C, E, F, and I (n = 13), EAA and a drop in laying for genotypes F, E, and C (n = 12), and synovitis for genotype A (n = 2). CONCLUSION: infection in layer chickens in Poland.
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Kursa et al. (2019) studied this question.
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