Mycoplasma hyopneumoniae vaccination influence on porcine reproductive and respiratory syndrome virus and mycoplasma hyopneumoniae coinfection
2001
Silin, D.S. | Lyubomska, O.V. (Odessa State Agricultural Inst. (Ukraine)) | Weng, C.N.
The aim of the present research was to clarify whether immunizatin against Mycoplasma hyopneumoniae only protects against porcine reproductive and respiratory syndrome development. The experiment was conducted on 20 specific pathogen free three-month-old piglets that previously acquired varying levels of protection against M. hyopneumoniae via oral or subcutaneous vaccination. The results suggest that M. hyopneumoniae initiates the pathogenic chain of M. hyopneumoniae - porcine reproductive and respiratory syndrome virus co-infection. The immunization against M. hyopneumoniae undoubtedly influences the development of porcine reproductive and respiratory syndrome virus - M. hyopneumoniae co-infection, however, the interactions between infectious agents and immune defense depend on the qualitative and quantitative parameters of immunity. The protection against M. hyopneumoniae disease development can prevent or, at least, delay porcine reproductive and respiratory syndrome in piglets and vice versa: the lung lesions and immune suppression caused by M. hyopneumoniae can open the gate to porcine reproductive and respiratory syndrome virus, which additionally complicates disease pathogenesis.
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