According to much scientific research, infection usually occurs between eight and twelve weeks of age with the first disease symptoms (unproductive cough) appearing, at the earliest, 10 to 14 days after infection. |
| Antibodies produced as a response to an infection may be detected soon after the onset of the cough. Evidence of antibodies is generally possible nine days after onset of the cough and therefore approximately three weeks after infection. |
| All current studies conclude that illness due to M hyo develops only after the pigs are moved to the finishing barns. |
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The pathogen can be introduced from outside the herd or can be transmitted within the herd. Studies have demonstrated that infection with M. hyo does not generally occur before nine weeks of age. |
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