Epidemiology Investigation of Co-infection with Porcine Circovirus Type 2 (PCV2), Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) and Porcine Parvovirus (PPV)

• 猪圆环病毒2型、猪繁殖与呼吸综合征病毒及猪细小病毒混合感染的流行病学调查