In a pig farm, weaning piglets aged 35 to 45 days, acutely died showing shaking of the eyes and systemic convulsion, and growing pigs aged 60 to 90 days showed anorexia, cough, dyspnea, limping with arthritis, and cyanosis and died within 4 days. The mortalities of weaning and growing pigs in September were 9.8% and 10.7%, respectively. While no specific lesions were found in weaning piglets, fibrinous pericarditis, pleurisy, pneumonia, peritonitis with turbid cerebrospinal and synovial fluids were observed in growing pigs.
Streptococcus suis was isolated from the heart, lung, liver, kidney, brain, and knee joints in both weaning and growing pigs. Ammoxicillin or sulfamonomethoxine-orimetoprim combination were administered in drinking water resulted in decreased mortality.
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