Why Flu Shot Can’t Give Flu To You
Flu vaccination prevents millions of flu-related illnesses and deaths annually, but vaccination rates are low for many reasons. A recent survey found that a large number of parents think the flu shot can result in flu infection.
During the 2018-2019 flu season, the Centers for Disease Control and Prevention reported that about 45% of U.S. adults received the flu vaccine. While this is an increase of 8% from 2017-2018, it falls way below the national goal of 70% of American adultIs receiving a flu shot.
One of the common myths that leads people to avoid the flu shot is that they think the shot will give them the flu. [ Flu Shot Facts & Side Effects Updated for 2018-2019 ]
But that is simply not true. The virus in the vaccine is not active, and an inactive virus cannot transmit disease. What is true is that you may feel the effects of your body mounting an immune response, but that does not mean you have the flu.
How Does The Flu Shot Work?
The flu shot works because it prompts your immune system to produce antibodies. In turn, these antibodies help the body fight off the types of flu virus that are present in the vaccine. After receiving the flu shot it takes about two weeks for these antibodies to fully develop.
Who Needs A Flu Shot?
Some people may be more prone to infection than others. That’s why the Centers for Disease Control (CDC) recommends that everyone 6 months of age or older be vaccinated against the flu. The shots are not 100-percent effective in preventing the flu. But they are the most effective method to protect against this virus and its related complications.
Certain groups are at an increased risk for getting the flu and developing potentially dangerous flu-related complications. It’s important that people in these high risk groups be vaccinated. According to the CDC, these individuals include:
- Pregnant women
- Children between 6 months and 5 years of age
- People 18 and under who receive aspirin therapy
- People over 50
- Anyone with chronic medical conditions
- People whose body mass index is 40 or higher
- American indians or alaska natives
- Anyone living or working in a nursing home or chronic care facility
- Caregivers of any of the above individuals.
Chronic medical conditions that could increase your risk of complications include:
- Heart or lung problems
- Metabolic diseases
- Neurological conditions, such as epilepsy
- Blood conditions, such as sickle cell anemia
- Kidney or liver disease
According to the CDC, people under the age of 19 who are on aspirin therapy as well as people taking steroid medications on a regular basis should also be vaccinated.
Workers in public settings have more risk of exposure to the disease, so it’s very important that they receive a vaccination. People who are in regular contact with at-risk individuals, such as the elderly and children, should also be vaccinated. Those people include:
- Daycare employees
- Hospital workers
- Public workers
- Healthcare providers
- Employees of nursing homes and chronic-care facilities
- Home care providers
- Emergency response personnel
- Household members of people in those professions.
People who live in close quarters with others, such as college students and members of the military, are also at a greater risk for exposure.
Each year the flu season is different, and the flu virus also affects people differently. One dangerous complication of the flu is pneumonia, which can result when your body is working hard to fight the flu. This is particularly dangerous in older adults, young children, and those whose immune systems aren’t working well, such as those receiving chemotherapy or transplant recipients.
Historically millions of Americans get the flu each year, hundreds of thousands are hospitalized and tens of thousands of people die from flu-related complications. During the 1918 flu pandemic, one-third of the world’s population, or about 500 million people, were infected with the flu. Since that time, vaccine science has dramatically changed the impact of infectious diseases.
The cornerstone of flu prevention is vaccination. The CDC recommends that everyone 6 months of age and older who does not have contraindications to the vaccine, receive the flu shot. And just as the polio vaccine won’t give a child polio, the flu vaccine will not cause the flu. That’s because the flu vaccine is made with inactive strains of the flu virus, which are not capable of causing the flu.
That said, some people may feel sick after they receive the flu shot which can lead to thinking they got sick from the shot.
However, feeling under the weather after a flu shot is actually a positive. It can be a sign that your body’s immune response is working. What happens is this: When you receive the flu shot, your body recognizes the inactive flu virus as a foreign invader. This is not dangerous; it causes your immune system to develop antibodies to attack the flu virus when exposed in the future.
This natural immune response may cause some people to develop a low-grade fever, headache or overall muscle aches. These side effects can be mistaken for the flu but in reality are likely the body’s normal response to vaccination.
And the good news is these natural symptoms are short-term side effects compared to the flu, which can last much longer and is more severe. It is estimated that less than 2% of people who get a flu shot will develop a fever.
Pre-shot Exposures And Mismatches
Some people do get the flu after they have received a flu shot, but that is not from the shot. It can happen for a couple of reasons.
First, they could have been exposed to the flu before they had the shot. It can take up to two weeks after receiving the flu shot to develop full immunity. Therefore, if you do get the flu within this period, it is likely that you were exposed to the flu either prior to being vaccinated or before your full immunity developed.
Second, depending on the strain of the flu virus that you are exposed to, you could still get the flu even if you received the vaccine. Every year, the flu vaccine is created to best match the strain of the flu virus circulating. Therefore, the effectiveness of the flu vaccine depends on the similarity between the virus circulating in the community and the killed viruses used to make the vaccine.
If there is a close match between the two, then the effectiveness of the flu vaccine will be high. However, if there is not a close match, vaccine effectiveness could be reduced. Still, it is imperative to note that even when there is not a close match between the circulating virus and the virus used to make the vaccine, the vaccine will still lessen the severity of flu symptoms and also help prevent flu-related complications.