peribronchiolitis/perivasculitis of the lung, internal pneumonia,
and lymphoid depletion.
The IFN- cytokine levels in the serum samples from the SW03-
Strain-infected pigs after the LOM vaccination or non-vaccination
were compared. The results showed higher IFN- level in all of pigs
(non-vaccination) at day 3 and day 7 post-challenge. No IFN- was
detected in the serum from the SW03 strain infected pigs (non-
vaccination) but the IFN- was positive for all of vaccinated pigs at
day 3, 7, 10, and 14 post-challenge (Table 4).