top of page


This is one of the vaccines that protects against RSV

Active ingredients:

The active ingredients in this vaccine are recombinant RSV PreF A and RSV PreF B antigens

RSV PreF is a glycoprotein (a protein with a sugar attached to it). The two antigens protect against the two main types of RSV: A and B.

This is a recombinant protein vaccine, which means that the instructions to make  are inserted into the genome of cells so that they produce the proteins. 

Note: this vaccine contains trace amounts of DNA and proteins from the cells used to produce the surface antigen. These cells are Chinese hamster ovary cells. 

Inactive ingredients:
Amounts are based on a 0.5 mL dose

Salts: help maintain the stability and pH of the vaccine

Carbohydrates (sugars): normally used as stabilizers in vaccines

Other Stabilizers:

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. 

  • Attenuated: The pathogen is weakened but not completely inactivated. Attenuated pathogens are too weak to cause disease in almost all people.

  • Genome: all of the genetic information in a cell. 

  • 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.

Anchor 1


Last updated: Sep. 9, 2023

bottom of page