Flu vaccine side effects

Influenza is a respiratory infection. Generally, when the influenza season comes, the influenza virus will spread wildly. Many people will be infected with the disease, causing respiratory discomfort or colds and other symptoms. In order to prevent being infected by influenza, many people will be injected with an influenza virus before the influenza arrives. This vaccine can enhance people's immunity and prevent influenza infection. But what are the side effects of the flu vaccine?

During the flu season, if you have poor immunity and often hang out in crowded places, your chances of contracting the flu are very high, so it is necessary to get a dose of vaccine before the flu arrives, but don't ignore the consequences of the flu vaccine.

1. Local reactions: In placebo-controlled double-blind trials, the most common side effect of vaccination is pain at the injection site (affecting 10-64% of patients); this can last up to two days after the flu shot. Within 24 hours after vaccination, recipients may feel pain and tenderness at the injection site. These reactions are generally mild and short-lived. In most cases, they disappear on their own within 2 to 3 days and do not require further medical attention.

2. Mild adverse events: Overall, recipients tolerated the influenza vaccine well. These vaccines are inactivated, meaning they contain only inactivated viruses that are apparently incapable of causing disease. Therefore, respiratory illness after vaccination is an incidental illness unrelated to the influenza vaccine. Fourteen studies that analyzed by sex showed that women (both young and old) reported significantly more local reactions.

3. The side effects of influenza vaccine also manifest in systemic reactions: mild systemic reactions may also occur. People who have not been previously exposed to the antigen in the vaccine (eg, children) may develop fever, malaise, and myalgias. These reactions occur within 6-12 hours after vaccination and generally last 1-2 days.

The above is an introduction to the side effects of influenza vaccines. Although getting vaccinated during the flu season can help many people avoid the flu, its side effects cannot be ignored. Of course, not everyone will experience this side effect. If unfortunately you are one of the people who experience the above side effects, you must go to the hospital for medical treatment in time if you find yourself feeling unwell.