Porcine reproductive and respiratory syndrome vaccine, based on isolate JA-142

The porcine reproductive and respiratory syndrome and toxic form (PRRS) a cell culture system is substantially non-toxic, monolithic PRRS virus and the vaccine is obtained for a corresponding service. Manufactured non-toxic irregular PRRS virus is useful to impart an effective immunity against PRRS virus strain newly isolated and irregular PRRS antibodies induce reaction to previously known strains PRRS virus by inoculation in a host animal. By passage to a preferred technique is the logarithmic growth phase is substantially maintained throughout the process of the virus, to achieve a weakening to minimize the time required. Porcine reproductive and respiratory syndrome, porcine reproductive and respiratory syndrome virus, atypical PRRS virus, vaccines, effective immunity