Which viruses can the trivalent influenza vaccine prevent?
Jun 05, 2025
Source: Cainiu Health
Dr. Ren Yi
Introduction
Under normal circumstances, the trivalent influenza vaccine refers to the trivalent influenza vaccine, which can prevent three types of viruses: influenza A (H1N1), influenza A (H3N2), and influenza B (Victoria lineage). These virus strains are updated annually based on predictions for the flu season to ensure the vaccine's effectiveness and specificity.
Generally, the trivalent influenza vaccine refers to the trivalent seasonal influenza vaccine. This vaccine can protect against three types of viruses: influenza A (H1N1), influenza A (H3N2), and influenza B (Victoria lineage). Detailed explanations are as follows:
1. Influenza A (H1N1)
Influenza A (H1N1) causes seasonal epidemics worldwide. This component in the trivalent influenza vaccine helps the human body develop immunity against the H1N1 virus, reducing the risk of infection.
2. Influenza A (H3N2)
Influenza A (H3N2) virus is similar to the H1N1 virus. The H3N2 component in the trivalent influenza vaccine can stimulate the body to produce corresponding immune responses, preventing infection with this strain of influenza virus.
3. Influenza B (Victoria lineage)
Influenza B virus has multiple lineages, among which the Victoria lineage is a commonly seen one. The trivalent influenza vaccine contains components targeting the Victoria lineage virus, effectively preventing infection with this lineage of influenza virus.
These viral strains are updated annually based on predictions for the influenza season, ensuring the vaccine's effectiveness and specificity. After receiving the trivalent influenza vaccine, the human body produces antibodies against these viruses, enabling rapid recognition and response upon exposure to the actual viruses. This effectively reduces the risk of influenza infection and alleviates symptoms and complications following infection.
