Viral respiratory diseases of nursery pigs

As pig production intensifies, so does the role of the respiratory virus. T his article describes three viral pathogens-pseudorabies virus, swine influ enza virus, and porcine respiratory coronavirus-known to be significant con tributors to respiratory disease problems experienced in nursery pig produc tion. (Although porcine reproductive and respiratory syndrome virus is not described in this article, several references are provided for interested r eaders.) An overview of the cause, epidemiology, clinical signs, diagnosis, and control measures of each virus is provided.