As shown in Fig. 4, 46% of vaccinated animals became M hyopneumoniae
seropositive at 4 wpv. M. hyopneumoniae seropositive
control animals were observed at 16 wpv and coughing as a sign
of M. hyopneumoniae infection was observed in the herd. The number
of seropositive animals in the vaccinated group was significantly
higher at each time point after vaccination (p < 0.01). At
slaughter, the lung lesion scores in the vaccinated group were
46% lower than in the control animals (p < 0.0001). In particular,
the percentage of animals with severe lung lesions (score >10)
was reduced by 56%. The number of animals with pleurisy was
lower in the vaccinated group (32% versus 39%), but this reduction
was not statistically significant (p = 0.121).
Vaccination with Porcilis PCV M Hyo induced a 34 g higher
ADWG during finishing (p < 0.0001) and a 19 g higher ADWG during
the entire study period (p = 0.0019) than in the control animals
(Table 3). Although morbidity and mortality were both lower in the
vaccinated group, the differences with the controls were not statistically
significant.