Significant changes in respiratory disease have occurred over the last 20 years. There are two primary reasons for this. In the first instance, there has been the occurrence of two major worldwide plagues-PRRS and PCV2-associated diseases. The second reason has been the considerable advances in vaccination, which have become available for some of the respiratory diseases, in particular Mycoplasma hyopneumoniae. Vaccines have also become available for porcine reproductive and respiratory syndrome virus (PRRS), influenza viruses (outside UK) and probably in the near future against porcine circovirus type 2 (PCV2).
Done, Stanley and Burch, David
"Prevention and Control of Respiratory Diseases Excluding Mycoplasma Hyopneumoniae,"
The Thai Journal of Veterinary Medicine: Vol. 37:
2, Article 10.
Available at: https://digital.car.chula.ac.th/tjvm/vol37/iss2/10