Vi capsular polysaccharide vaccine

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Not to be confused with Ty21a. For an overview of vaccines against typhoid fever, see Typhoid vaccine.

Vi capsular polysaccharide vaccine
Vaccine description
Target disease Typhoid
Type Subunit
Clinical data
Legal status
  • US: -only
  • intramuscular injection , subcutaneous injection
ATC code J07AP03
 N (what is this?)  (verify)

The Vi capsular polysaccharide vaccine (or ViCPS) is one of two vaccines recommended by the World Health Organisation for the prevention of typhoid (the other is Ty21a). It was first licensed in the US in 1994 and is made from the purified Vi capsular polysaccharide from the Ty2 Salmonella Typhi strain; it is a subunit vaccine.


The vaccine may be used in endemic areas in order to prevent typhoid. It is also commonly used to protect people who are traveling to parts of the world where typhoid is endemic.


The vaccine is injected either under the skin or into a muscle at least seven days before traveling to the typhoid-affected area (the CDC recommend 14 days). The vaccine is not effective in children under the age of two; children under the age of two would normally have all their food regulated by their parents and should therefore be expected to be at low risk of exposure to typhoid.

To maintain immunity, the vaccine should be repeated every three years.

Efficacy and duration of protection[edit]

The vaccine offers effective protection the first year after being given (with between 50% to 80% efficacy) and the second year (31% to 76%), but not after that.[1]

Trade names[edit]


  1. ^ Fraser A, Goldberg E, Acosta CJ, Paul M, Leibovici L (2007). "Vaccines for preventing typhoid fever". Cochrane Database Syst Rev (3): CD001261. doi:10.1002/14651858.CD001261.pub2. PMID 17636661.