immunizes against pathogen Shigella flexneri Shigella flexneri vaccine Shigella flexneri 2a strain CVD 1203 vaccine S. flexneri 2a strain CVD 1203 VIOLIN: https://violinet.org/vaxquery/vaccine_detail.php?c_vaccine_id=262 Oliver He vaccine Rebecca Racz 262 An aroA and virG mutant (CVD 1203) is attenuated in guinea pigs, as shown by the Sereny test. Guinea pigs inoculated with CVD 1203 were also protected from challenge with wild type S. flexneri