We resume the section on PRRS with new authors and subjects, or updating subjects that we have already dealt with. In spite of the years of experience with regard to this virus, it is still one of the diseases that causes more production losses (very recent estimates calculate that the losses in the USA are approximately 664 million dollars per year). When comparing these figures with previous estimates, we realize that we have not been able to reduce its economic impact. Nevertheless, the losses are shifting from the growing pig herd to the sow herd.
We are initiating this series with an article by Derald Holtkamp entitled "The cost of PRRS for pig producers" in which we are presenting the last financial estimates of the losses due to PRRS. The next articles will deal with the disease from an immunologic, epidemiologic, and control viewpoint; we will talk about biosecurity, sampling protocols, regional control or eradication programs and the interaction with other diseases.