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Bulletin No. 22 - Summer 2005
BacterologyMycoplasma hyopneumoniae
VEZZOLI F, BOLDETTI C, COSTA A, GUALDI V, LUINI M, NIGRELLI AD
Epidemiologia dell’infezione da Mycoplasma hyopneumonie in allevamenti intensivi della pianura padana [Epidemiology of Mycoplasma hyopneumoniae infection in intensive pig farming in the Po Valley].
Società Italiana di Patologia ed Allevamento dei Suini - Proceedings, 2005, 497-504
The timing and the spread pattern of M. hyopneumoniae infection was investigated in ten pig herds from the Po Valley North Italy. Half of them applied a vaccination plan against M. hyopneumoniae while the other half did not. In each herd, a monitoring was carried out in 10 animals of each category (sows, and pigs at 3, 10, 15 and 22 weeks of age) through blood samples and nasal swabs submitted to antibody detection by ELISA and M. hyopneumoniae DNA PCR respectively. M. hyopneumoniae was not detected in the vaccinated herds. Conversely, in the unvaccinated herds, the circulation of M. hyopneumoniae resulted particularly high as indicated by the positive serology in sows, the high percentage of seropositivity in 22-week-old pigs and the positive results of PCR. In these herds, the results of the monitoring suggest that infection occurred rather late, at about 15 weeks of age. Therefore, it is highly advisable to determine the dynamics of M. hyopneumoniae infection before implementing any vaccination plan against M. hyopneumoniae in order to delay the time of vaccination if infection is found to occur rather late in the production cycle.
