Typhoid Vaccine Good For How Long. Typhoid conjugate vaccine, ty21a and vi capsular polysaccharide vaccine. In the uk, the 2 main vaccines available to prevent typhoid fever are: Bharat Biotech expects WHO review of Covaxin EUL to begin from timesofindia.indiatimes.com Do not allow the capsules to freeze. Antimicrobial agents should not be started within 3 …