National Institute of Health (NIH) Park Road, Chak Shahzad, Islamabad, Pakistan
Typhoid vaccine is a suspension of killed Salmonella typhi, containing not less’than, 1,000 million bacteria of S. Typhi Ty-2 strain and 500 million each of Salmonella typhi A & B strains per human dose of 1 mi. Preserved by 0 .5%Phenol.
The strain used has the full complement of o H. and VI antigens The organisms are killed by heating at 56°C for one hour and by addition of Phenol 1%.
The typhoid vaccine is justified under the following conditions: