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Bulletin No. 26 - Fall 2006
BacterologyMycoplasma hyopneumoniae
SALA V, GUSMARA C, INVERNIZZI F, LEOTTI G
Studio siero-epidemiologico dell'infezione da M. hyopneumoniae sulla linea scrofa suinetto [Sero-epidemiological study of M. hyopneumoniae infection transmission from sow to offspring].
ocietà Italiana di Patologia ed Allevamento dei Suini - Proceedings, 2006, 253-262
This study was carried out in order to better understand the epidemiological role of sows in the diffusion of M. hyopneumoniae in an Italian farrow-to-finish farm where routine vaccination for M. hyopneumoniae had never been done and thus did not interfere with the serological profiles of sows. The M. hyopneumoniae antibody level of 15 sows of various parities and two thirds of their offspring was periodically determined by competition ELISA. The post-farrowing situation was that of 12 seronegative sows, 2 seropositive sows and one doubtful sow. At 10 days of life, all piglets resulted seronegative except for part of those born of seropositive sows which all became seronegative by the end of the weaning period (25 days of life). Maternally-derived immunity thus appeared shorter than expected since it was already over at weaning. By contrast, tests carried out at 150 days of life showed a seroconversion of 70% of the animals. In all probability, such belated seroconversion is not to ascribe to the low microbial load of sows observed in this study but rather to the continuous flow of the herd. Once more, it is important to underline that an evaluation of the epidemiological situation of a herd regarding M. hyopneumoniae should absolutely take into account the epidemiological situation of the sows.
