There was a sudden increase in mortality in a site 2 farm with the loss of the "biggest piglets" in the group.No particular symptomatology was seen but every day some dead piglets were found.
A sudden death of animals, with no prior symptoms of disease, and clinical symptoms such as massive facial, ears and forechest oedema, as well as an increase of body temperature to 41.5ºC, were observed.
A cough outbreak appeared in 8-9 weeks old piglets. It apparently was a "normal" outbreak that could be solved with a few days of antibiotic but the pigs did not respond to the treatment.
The pen and farm charts indicated a rapid jump to 40 % mortality in several finisher sheds over one to 2 weeks.
The litter size of the recent and the last farrowing batches was significantly reduced, and the suckling pigs showed an obvious varying weight, condition and viability.
In a factory farm located in Mexico an increase in the mortality in the farrowing quarters was seen, and this coincides with temperature and relative humidity increases.
The nervous system symptomatology is characterized by some cases of meningitis and opistothonus, dizziness and serious deep depression in a great number of animals. The necropsy shows, in all the cases, a serious lung congestion and an enteritis with a variable seriousness with a more or less important involvement of the mesenteric lymph nodes.
This case describes an acute outbreak of gastric ulcers in pigs of 30-40 kg live weight that affected 38 farms throughout a year and that presented mortalities from a 5% up to a 40% depending on the severity of the cases.
The pig farm management team in charge of the post-weaned piglet nursery areas on these wean-to-finish sites has found serious problems with diarrhoea in recent batches of piglets arriving from the breeding farms.
In July 2010 a severe respiratory disease occurred in the farm: coughing in gilts, and coughing and depression in fatteners concomitantly to an increase of the mean stillborn and mummified piglet rate in a batch of sows.