Influenza vaccine

Influenza vaccines, also known as flu shots, are vaccines that protect against influenza. A new version of the vaccine is developed twice a year as the influenza virus rapidly changes. While their effectiveness varies from year to year, most provide modest to high protection against influenza.

Although the influenza vaccine is generally recommended for vulnerable populations such as the eldery, children, infirm and those working in certain occupations such as medicine, there is considerable debate around the topic of whether ME/CFS patients should receive them, with some doctors recomending them and others warning patients to avoid the vaccine.