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Typhim Vi

This vaccine protects against typhoid


Active ingredients:

This is a polysaccharide vaccine, meaning that the antigen in this vaccine is a sugar from the outside of the bacterium Salmonella enterica serovar Typhi, S. typhi Ty2 strain. 

Because this contains a sugar (not the whole bacterium), you cannot get typhoid from the vaccine. 

Inactive ingredients:
Amounts are based on a 0.5 mL dose

Salts: help maintain the stability and pH of the vaccine


Relevant Terms:

  • Antibody: a protein made by the immune system in response to a foreign particle (antigen). These proteins circulate in the blood and help defend the body against the substance.  

  • Antigen: This is any substance that triggers the immune system to create antibodies. For example, allergens such as pollen are antigens. 

  • Bacteria: A type of single-celled organism. Some can cause disease, but many are harmless and some actually benefit humans by living in the intestines and helping with digestion 

  • Bacterium: The singular of bacteria (one bacterium, two bacteria)

  • Electrolytes: chemical substances with a positive or negative charge that help to maintain the pH and fluid balance in the body so that the organs can function properly. Some common examples of electrolytes are sodium (Na+), potassium (K+), and chloride (Cl-). 

  • pH: a measure of how acidic or basic a solution is. The scale ranges from 0 (very acidic) to 14 (very basic). A pH of 7 is neutral.

  • Polysaccharide: another word for sugar

  • Preservative: a type of ingredient used to prevent contamination


Last updated: Apr. 4, 2023

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