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Bulletin No. 19 - Fall 2004
18th IPVS Congress, Hamburg, Germany, 2004Mycoplasma hyopneumoniae
NIGRELLI A, LEOTTI G, JOISEL F, LONGO S
Long-term protection against Mycoplasma hyopneumoniae by two vaccination programs in Parma's ham production system
Proceedings of the 18th IPVS Congress, Hamburg, Germany, 2004 - Volume 1:444
The ability of the inactivated vaccine Hyoresp® (Merial), to provide long-term protection against M. hyo to heavy pigs raised until 9 months of age was evaluated in a farrow-to-finish Italian farm. A total of 829 piglets were distributed into 3 treatment groups as follows: group C in which animals were kept as non-vaccinated controls, group VP in which animals were vaccinated early (at 1 and 4 weeks of age) and group VT in which animals were vaccinated late (at 6 and 9 weeks of age). Lung lesion scores at slaughter were used as parameter and with a scale ranging from 0 to 4. A total of 505 lungs were examined. A significant difference was found between the control group and the vaccinated groups which had significantly lower lesion scores, while no significant difference was observed between the two vaccinated groups. Therefore, Hyoresp® was shown to provide a long-lasting protection against M. hyo in this particular kind of management.
