has role immunizes recipient immunizes against pathogen Shigella flexneri Homo sapiens CVD 1208S vaccine Oliver He VIOLIN: https://violinet.org/vaxquery/vaccine_detail.php?c_vaccine_id=272 vaccine CVD 1208S is the same thing as CVD 1208, but CVD 1208S was prepared using animal-free media. 272 PMID:17938573 CVD 1208S Shigella flexneri vaccine live attenuated bacterial vaccine live attenuated vaccine role