[Prevalence and genetic study of Mycoplasma gallisepticum and M. synoviae strains from commercial laying hens in the Midwest region of Sao Paulo state, Brazil]

ABSTRACT The aim of this study was to evaluate the prevalence of MG and MS and the phylogeny of the circulating strains, comparing them with others already described in commercial laying hens from Brazil. A total of 140 tracheal swabs were collected from commercial laying hens with respiratory signs in six farms from the western region of São Paulo state. The samples were analyzed by PCR with subsequent sequencing and phylogenetic analysis of the identified strains. From the 140 samples, 68.6% were positive for MS and 16.4% for MG. There was a significant difference in the frequencies of MG and MS per farm according to G Test of independence (P