Vaccination stimulates the immune system against a vaccine-preventable disease like the flu. The flu shot helps your body make antibodies to fight the flu virus. It takes approximately 2 weeks for a flu shot to start working and help protect you from the flu.
Flu viruses change each year. New flu vaccines are created every year to fight the latest virus. Plus, the immunity you get from a flu shot only lasts about a year.
Any side effects are generally mild and go away within a few days. Common side effects include soreness or redness at the injection site, headache, fever, nausea, and muscle aches.
Recent studies from the Centers for Disease Control and Prevention show that, on average, the flu vaccine can reduce the risk of flu by 40% to 60%. Effectiveness can vary based on how well the vaccine matches the strain of the virus each year. But even if you get the flu, the vaccine can still help make your symptoms less severe.
No. The flu shot can’t give you the flu. The vaccine doesn’t contain a live virus, so it can’t make you sick.
Yes. It’s possible to get the flu even if you got a flu shot. This may happen because:
You caught the flu before the vaccine started to work. It takes 2 weeks for the vaccine’s antibodies to develop and protect you from the virus.
You got a virus that isn’t covered by the flu vaccine. The vaccine protects against 3 or 4 of the most common viruses expected during a specific year.
The official answer from the CDC is no, the flu shot will not help protect you from COVID-19. While it’s true that seasonal flu and COVID-19 are both contagious respiratory illnesses, the flu shot is designed to help protect against the two main types of influenza viruses, A and B viruses. COVID-19 is caused by infection with the coronavirus, a new virus also called SARS-CoV-2, which is different than the influenza viruses.
There are similarities and differences between COVID-19 and the flu, so the best advice is to familiarize yourself and your employees with the comparisons as follows. This information is from the CDC.
With both COVID-19 and flu, adults may experience fevers (with or without chills), cough, shortness of breath, sore throat, fatigue, runny or stuffy nose, muscle pain or body aches, headache, and sometimes vomiting or diarrhea. COVID-19 also may be associated with loss of smell or taste.
It may take longer for symptoms to appear with COVID-19 than with the flu. With COVID-19, the time from infection to first symptoms may be anywhere from two days to 14 days. Flu symptoms generally appear one to four days after infection.
We are still learning about COVID-19 but it’s believed a person can spread the virus from two days before symptoms appear to 10 days after symptoms first appeared or until 10 days after testing, if the employee was asymptomatic when tested and has remained without symptoms. A longer period of infectiousness may occur for people who are severely immunocompromised or hospitalized with severe COVID-19. With flu, an adult may be contagious from one day before showing symptoms for about seven days after symptoms appear.