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Immunosuppression
(67) There are many factors that suppress both innate and acquired immunity levels but in pigs infectious agents are the most common ones. These include:- Mycoplasma hyopneumoniae the cause of enzootic pneumonia.
- Pasteurella multocida.
- Aujeszky's disease virus.
- Swine influenza virus.
- African swine fever virus.
- PRRS virus.
Weaning time is also a period of immuno-suppression by withdrawal of the sows milk that contains the protective mechanisms of IgA. When pigs are mixed, moved or stressed the plasma cortisol levels rise with a similar effect and the demand for vitamin E rises.
