Ear necrosis syndrome in weaning pigs associated with PCV۲ infection: A case report

Porcine necrotic ear syndrome (PNES) in pigs has been reported as an increasing health problem in many countries with intensive pig farming. The etiology of this disease is complex and the presumed triggering factors can be divided into infectious and non-infectious agents. The present report describes a case of Porcine Circovirus type ۲ (PCV۲), infection associated with lesions of PNES at the weaning stage of a farrow-to-finish pig farm. Approximately ۳۵% of weaners (۱-۳ weeks after weaning) presented clinical symptoms similar to Post-weaning Multisystemic Wasting Syndrome (PMWS). About ۲-۳ weeks after weaning the first lesions of PNES occurred in approximately ۲۰% of pigs, resulting in a significant health problem characterized by poor growth or severe wasting and finally mortality up to ۱۵% in some batches. Moreover, approximately ۵% of survived weaners, during growing / finishing stage, presented poor growth and secondary co-infections that lead to death. The present study based on the clinical signs, serological and pathological examinations, indicates that weaners suffered by sub-acute PCV۲ infection resulting in PMWS associated with PNES. The lesions of PNES were initially observed at the same period (۴-۸ weeks of age) with the higher seroprevalence of PCV۲ infection. Metaphylaxis of this case included intramuscular injection of florfenicol for the treatment and control of skin lesions and respiratory signs. Moreover, piglets were vaccinated against PCV۲. In conclusion, sub-acute PCV۲ infection could be included in triggering factors PNES in weaners. The mass vaccination against PCV۲ of infected piglets might be effective in reduction of clinical signs and losses of PNES in cases of PCV۲ infection associated with PNES.

Keywords:

Circovirus , PMWS , Ear necrosis , Pig , Vaccine