Abstract
Mycoplasma pulmonis is a naturally occurring respiratory pathogen in rodents. To date, this pathogen was not isolated from humans. This study aimed to evaluate the prevalence and seropositivity to M. pulmonis in humans who have had direct contact with rats. Moreover, the prevalence of M. pulmonis in pet and laboratory rats was assessed. Overall, 131 and 235 oropharyngeal swab samples were collected from human individuals and rats, respectively. In humans, M. pulmonis was detected by PCR in 21 of 86 pet rat keepers (24.42%), 10 of 13 technicians (76.32%), and 8 of 32 (25.0%) veterinarians. In rats, M. pulmonis was identified by PCR in 86 of 122 pet rats (70.49%) and 56 of 113 (49.56%) laboratory rats. Seroprevalence in humans was examined by screening sera from 44 individuals for M. pulmonis-specific IgG using ELISA. In total, 26 out of 44 (59.09%) humans were seropositive to M. pulmonis (4 out of 9 technicians, 8 of 12 veterinarians, and 15 of 23 pet rat keepers).The high antibody titer was found in 4 individuals (2 pet rat keepers and 2 veterinarians), whereas the moderate and low antibody titers were found in 8 and 14 individuals, respectively. The high antibody titer found in humans might indicate an active infection. However, it is unknown whether the presence of M. pulmonis in humans might be associated with disease and whether the foreign Mycoplasma can survive for long in its new environment.
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