[Immune ascitic fluids in rats to the Sindbis virus].

Data are presented concerning preparation of universal immune ascitic fluid (IAF) to Sindbis virus possessing a high activity and specificity in different serological tests: CFT, HI, NT, AGDPT, and direct immunofluorescence test. The advantages of rat IAF over the serum of these animals consists in a higher specific activity, lower amount of nonspecific hemagglutination inhibitors and waste protein substances. Rat IAF may be used for production of highly specific diagnostic preparations.