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So although the person may have been vaccinated against or infected by an ‘old’ version of the viral strain, the body won’t easily recognise and neutralise the new strain.ĭue to these continuous changes, the World Health Organisation reviews and updates its recommendations for the composition of the vaccine annually. When the body encounters these changes, the immune system cannot be activated. These surface proteins aren’t stable and often mutate, or change. The four types are related to the presence of specific proteins on the surface of the virus. Types A and B cause severe disease in humans, and each year the seasonal flu vaccine protects against two A and two B strains. There are four types (or strains) of influenza viruses: A, B, C or D. So while antibodies decrease over time, they generally last longer than a typical influenza season.Ĭurrent recommendations are to get vaccinated from April, before the flu season, which generally occurs from June to September. While flu vaccines offer the highest level of protection three or four months after vaccination, research suggests antibodies continue to protect against infection 8.5 months after vaccination and 11.8 months after natural infection. Rather, they prompt the body’s immune system to respond, much as it would have on its first reaction to the actual virus.įlu vaccines stimulate antibodies to develop in the body usually within two weeks following vaccination. Vaccines don’t cause disease in the person. COVID restrictions are being wound back, so when can you expect the end of the pandemic? When do they start working? How long do they last?