Evaluation of the use of various rat strains for immunogenic potency tests of Sabin-derived inactivated polio vaccines

Publication date: March 2018Source: Biologicals, Volume 52Author(s): Yuichi Someya, Yasushi Ami, Reiko Takai-Todaka, Akira Fujimoto, Kei Haga, Kosuke Murakami, Yoshiki Fujii, Haruko Shirato, Tomoichiro Oka, Takashi Shimoike, Kazuhiko Katayama, Takaji WakitaAbstractSlc:Wistar rats have been the only strain used in Japan for purpose of evaluating a national reference vaccine for the Sabin-derived inactivated polio vaccine (sIPV) and the immunogenicity of sIPV-containing products. However, following the discovery that the Slc:Wistar strain was genetically related to the Fischer 344 strain, other “real” Wistar strains, such as Crlj:WI, that are available worldwide were tested in terms of their usefulness in evaluating the immunogenicity of the past and current lots of a national reference vaccine. The response of the Crlj:WI rats against the serotype 1 of sIPV was comparable to that of the Slc:Wistar rats, while the Crlj:WI rats exhibited a higher level of response against the serotypes 2 and 3. The immunogenic potency units of a national reference vaccine determined using the Slc:Wistar rats were reproduced on tests using the Crlj:WI rats. These results indicate that a titer of the neutralizing antibody obtained in response to a given dose of sIPV cannot be directly compared between these two rat strains, but that, more importantly, the potency units are almost equivalent for the two rat strains.

Source: Biologicals - July 5, 2018 Category: Biology Source Type: research