Can I Get the Flu From a Flu Shot

Note: Prevention and Command of Seasonal Flu with Vaccines: Recommendations of the Informational Committee on Immunization Practices — United States, 2021-2022 Flu Flavor" has been published. More data on the 2021-2022 season is as well available.

• Flu Vaccination
• Vaccine Effectiveness
• Vaccine Benefits
• Vaccine Match
• Vaccine Side Effects
• Vaccine Supply and Distribution

Flu Vaccination

Why should people go vaccinated against flu?

Influenza (flu) is a potentially serious disease that can lead to hospitalization and sometimes even death. Every flu flavor is unlike, and flu tin can affect people differently, just millions of people get flu every year, hundreds of thousands of people are hospitalized and thousands to tens of thousands of people die from flu-related causes every year. Flu tin can mean a few days of feeling bad and missing work or information technology can result in more than serious affliction. Complications of flu can include bacterial pneumonia, ear infections, sinus infections and worsening of chronic medical weather, such as congestive heart failure, asthma, or diabetes. An annual seasonal flu vaccine is the best way to help protect confronting flu. Vaccination has been shown to have many benefits including reducing the risk of flu illnesses, hospitalizations and even the risk of flu-related decease in children. While some people who get a flu vaccine may yet go sick, flu vaccination has been shown in several studies to reduce severity of illness.

How practise flu vaccines work?

Influenza vaccines cause antibodies to develop in the body about two weeks after vaccination. These antibodies provide protection against infection with circulating influenza viruses.

Seasonal flu vaccines are designed to protect against the influenza viruses that research indicates volition be most common during the upcoming season. All flu vaccines in the United States are "quadrivalent" vaccines, which ways they protect against four different flu viruses: an flu A(H1N1) virus, an influenza A(H3N2) virus, and two influenza B viruses.

What kinds of flu vaccines are available?

CDC recommends utilize of whatsoever licensed, age-appropriate influenza vaccine during the 2021-2022 flu season. Available influenza vaccines include quadrivalent inactivated flu vaccine [IIV4], recombinant influenza vaccine [RIV4], or live attenuated influenza vaccine (LAIV4). No preference is expressed for whatever influenza vaccine over another.

Quadrivalent flu vaccines include:

• Standard-dose quadrivalent influenza shots that are manufactured using virus grown in eggs.  These include Afluria Quadrivalent, Fluarix Quadrivalent, FluLaval Quadrivalent, and Fluzone Quadrivalent. Unlike influenza shots are licensed for different age groups. These four vaccines are approved for people 6 months of age and older. Most flu shots are given in an arm muscle with a needle. One quadrivalent flu shot (Afluria Quadrivalent) tin be given either with a needle (for people anile 6 months and older) or with a jet injector (for people anile 18 through 64 years just).
• A quadrivalent cell-based influenza shot (Flucelvax Quadrivalent) containing virus grown in prison cell culture, which is licensed for people 4 years and older. This vaccine is egg-gratis.
• Recombinant quadrivalent influenza shot (Flublok Quadrivalent), an egg-gratuitous vaccine, approved for people xviii years and older.
• A quadrivalent flu shot using an adjuvant (an ingredient that helps create a stronger immune response), Fluad Quadrivalent, approved for people 65 years of age and older.
• A quadrivalent high-dose influenza vaccine Fluzone High-Dose, which contains a higher dose of antigen to help create a stronger immune response, licensed for people 65 years and older.
• A alive attenuated flu vaccine (FluMist Quadrivalent), which is given intranasally. This vaccine is approved for people 2 through 49 years of age. Live attenuated flu vaccine should not be given to people who are meaning, immunocompromised persons, and another groups.
• There are many flu vaccine options to choose from, but the most important affair is for all people 6 months and older to get a flu vaccine every year. If you have questions about which vaccine is all-time for you, talk to your doctor or other health care professional. More data on approved flu vaccines for the 2021-2022 influenza season, and historic period indications for each vaccine are available in CDC's Table: U.S. Influenza Vaccine Products for the 2021-2022 Flavor.

Are whatever of the bachelor influenza vaccines recommended over others?

For the 2021-2022 flu season, the Informational Committee on Immunization Practices (ACIP) recommends almanac influenza (influenza) vaccination for everyone six months and older with any licensed, influenza vaccine that is appropriate for the recipient'south age and health status, including inactivated influenza vaccine (IIV4), recombinant influenza vaccine (RIV4), or live attenuated nasal spray flu vaccine (LAIV4) with no preference expressed for any one vaccine over another.

There are many vaccine options to choose from, but the most important affair is for all people half-dozen months and older to get a flu vaccine every year. If you take questions about which vaccine is best for you, talk to your doctor or other health care professional.

Who Should Vaccinate?

Everyone half-dozen months of age and older should get an influenza (influenza) vaccine every season with rare exception. CDC'south Advisory Commission on Immunization Practices has fabricated this recommendation since the 2010-2011 influenza flavour.

Vaccination to prevent flu and its potentially serious complications is particularly of import for people who are at higher run a risk of developing serious flu complications. Meet People at Higher Adventure of Developing Flu-Related Complications for a full list of age and health factors that confer increased risk.

More information is available at Who Needs a Influenza Vaccine.

Who Should Not Exist Vaccinated?

Different influenza (flu) vaccines are approved for use in people in different age groups. In addition, some vaccines are not recommended for certain groups of people. Factors that can determine a person's suitability for vaccination, or vaccination with a particular vaccine, include a person's historic period, wellness (electric current and by) and any allergies to flu vaccine or its components. For more information, visit Who Should and Who Should Not become a Flu Vaccine.

When should I get vaccinated?

Information technology's all-time to be vaccinated earlier influenza begins spreading in your community. September and October are generally skillful times to be vaccinated confronting flu. Ideally, everyone should be vaccinated past the end of October. However, fifty-fifty if you are not able to get vaccinated until November or subsequently, vaccination is yet recommended considering flu most commonly peaks in February and pregnant activity can continue into May.

Additional considerations concerning the timing of vaccination for certain groups include:

• Adults, peculiarly those 65 years and older, should generally not get vaccinated early (in July or August) considering protection may decrease over time, but early vaccination can be considered for any person who is unable to return at a subsequently time to be vaccinated.
• Children can get vaccinated as soon as vaccine becomes available, even if this is in July or August. Some children demand two doses of influenza vaccine. For those children it is recommended to get the first dose as soon as vaccine is bachelor, because the 2d dose needs to be given at least 4 weeks subsequently the first.
• Early vaccination can too be considered for people who are in the 3rd trimester of pregnancy, because this can help protect their infants during the kickoff months of life (when they are too young to exist vaccinated).

Where can I get a flu vaccine?

Flu Vaccine Finder

Detect flu vaccines in your area.
Anybody 6 months of age and older needs a flu vaccine.

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Influenza vaccines are offered in many doctor'due south offices and clinics. Even if you don't have a regular medico or nurse, you lot can get a flu vaccine somewhere else like a wellness department, pharmacy, urgent care dispensary, college health center, and even in some schools and workplaces.

Why do I need a influenza vaccine every yr?

A flu vaccine is needed every year for two reasons. Get-go, a person's immune protection from vaccination declines over time, so an annual flu vaccine is needed for optimal protection. Second, because flu viruses are constantly irresolute, the composition of flu vaccines is reviewed annually, and vaccines are updated to protect against the viruses that research indicates will be nearly common during the upcoming influenza season. For the all-time protection, everyone 6 months and older should get vaccinated annually.

Does flu vaccine work correct abroad?

No. Information technology takes well-nigh ii weeks subsequently vaccination for antibodies to develop in the torso and provide protection against flu virus infection. That's why it's best to get vaccinated earlier influenza viruses offset to spread in your community.

Vaccine Effectiveness

Influenza (influenza) vaccine effectiveness (VE) can vary. The protection provided by a flu vaccine varies from season to season and depends in part on the age and health condition of the person getting the vaccine and the similarity or "match" betwixt the viruses in the vaccine and those in apportionment. During years when the influenza vaccine match is expert, it is possible to measure out substantial benefits from flu vaccination in terms of preventing flu illness and complications. However, the benefits of flu vaccination will all the same vary, depending on characteristics of the person existence vaccinated (for instance, their health and age), what influenza viruses are circulating that season and, potentially, which type of flu vaccine was used. For more information, see Vaccine Effectiveness – How well does the Flu Vaccine Work. For information specific to this season, visit About the Current Flu Flavour.

Can I go seasonal influenza even though I got a flu vaccine this year?

Yes. It'southward possible to get sick with flu even if y'all have been vaccinated (although yous won't know for sure unless you become a flu test). This is possible for the following reasons:

• You may be exposed to a flu virus shortly before getting vaccinated or during the period that it takes the body to gain protection after getting vaccinated. This exposure may outcome in yous condign ill with influenza before the vaccine begins to protect yous. (Antibodies that provide protection develop in the torso well-nigh ii weeks after vaccination.)
• You may be exposed to a influenza virus that is not included in the seasonal flu vaccine. There are many different flu viruses that circulate every year. A flu vaccine is fabricated to protect against the three or four flu viruses that research suggests will be almost common.
• Unfortunately, some people can become infected with a influenza virus a flu vaccine is designed to protect against, despite getting vaccinated. Protection provided by influenza vaccination can vary widely, based in part on health and age factors of the person getting vaccinated. In general, a influenza vaccine works all-time among healthy younger adults and older children. Some older people and people with certain chronic illnesses may develop less amnesty after vaccination. Influenza vaccination is not a perfect tool, but information technology is the best manner to protect confronting flu infection.

What protection does a flu vaccine provide if I do become sick with flu?

Some people who go vaccinated may however go sick with flu. However, influenza vaccination has been shown in some studies to reduce severity of illness in people who get vaccinated but still go ill. A 2022 studyexternal icon showed that among adults, influenza vaccination was associated with a 26% lower risk of ICU admission and a 31% lower chance of death from flu compared with those who were unvaccinated. A 2022 study showed that flu vaccination reduced deaths, intensive care unit of measurement (ICU) admissions, ICU length of stay, and overall duration of hospitalization amongst hospitalized adults with flu.

Vaccine Benefits

What are the benefits of flu vaccination?

In that location are many reasons to get an influenza (influenza) vaccine each year. Influenza vaccination is the best way to protect yourself and your loved ones confronting flu and its potentially serious complications.

Beneath is a summary of the benefits of influenza vaccination and selected scientific studies that support these benefits.

• Flu vaccination can go on you from getting ill with flu.

• • Flu vaccination prevents millions of illnesses and flu-related doctor'southward visits each year. For example, during  2019-2020 flu vaccination prevented an estimated 7.5 million influenza illnesses, three.vii meg influenza-associated medical visits, 105,000 influenza-associated hospitalizations, and 6,300 flu-associated deaths.
  • During seasons when influenza vaccine viruses are similar to circulating flu viruses, flu vaccine has been shown to reduce the risk of having to go to the doctor with flu by 40 percent to threescore percentage.

• Flu vaccination has been shown in several studies to reduce severity of illness in people who become vaccinated but still get sick.
  • A 2022 studyexternal icon showed that amid adults, flu vaccination was associated with a 26% lower risk of ICU access and a 31% lower risk of decease from flu compared to those who were unvaccinated.
  • A 2022 reportexternal icon showed that amid adults hospitalized with flu, vaccinated patients were 59 percent less likely to be admitted to the ICU than those who had non been vaccinated. Amidst adults in the ICU with influenza, vaccinated patients on average spent 4 fewer days in the hospital than those who were not vaccinated.

• Flu vaccination tin reduce the risk of flu-associated hospitalization.
  • Flu vaccination prevents tens of thousands of hospitalizations each year. For example, during 2019-2020 flu vaccination prevented an estimated 105,000 flu-related hospitalizations.
  • A 2014 written reportexternal icon showed that flu vaccination reduced children'southward gamble of influenza-related pediatric intensive intendance unit of measurement (PICU) access by 74 pct during influenza seasons from 2010-2012. A 2022 written report found that during 2009-2016, influenza vaccines reduced the adventure of flu-associated hospitalization amidst older adults past nigh 40 percent on average.
  • A 2022 study showed that from 2012 to 2015, influenza vaccination among adults reduced the take chances of being admitted to an intensive intendance unit of measurement (ICU) with flu by 82 percent.

• Flu vaccination is an important preventive tool for people with sure chronic health conditions.
  • Flu vaccination has been associated with lower rates of some cardiac eventsexternal icon among people with centre disease, peculiarly amongst those who accept had a cardiac result in the by year.
  • Influenza vaccination tin can reduce the risk of a flu-related worsening of chronic lung affliction (for example, chronic obstructive pulmonary affliction (COPDexternal icon) requiring hospitalization.
  • Amidst people with diabetesexternal icon and chronic lung diseaseexternal icon ,flu vaccination likewise has been shown in separate studies to be associated with reduced hospitalizations from a worsening of their chronic condition.

• Flu vaccination helps protect meaning people during and after pregnancy.
  • Vaccination reduces the run a risk of flu-associated astute respiratory infection in pregnant people by about one-half.
  • A 2022 studyexternal icon showed that getting a flu shot reduced a pregnant person's gamble of being hospitalized with flu by an boilerplate of forty pct from 2010-2016.
  • A number of studies have shown that in add-on to helping to protect significant people from flu, a influenza vaccine given during pregnancy helps protect the baby from flu for several months after birth, when he or she is too young to be vaccinated.

• Influenza vaccine can be lifesaving in children.
  • A 2022 study was the kickoff of its kind to prove that flu vaccination tin can significantly reduce a child'south risk of dying from influenza.

• Getting vaccinated yourself may too protect people around yous, including those who are more vulnerable to serious flu illness, like babies and immature children, older people, and people with certain chronic health conditions.

Despite the many benefits offered by flu vaccination, simply near one-half of Americans get an almanac influenza vaccine and flu continues to crusade millions of illnesses, hundreds of thousands of hospitalizations and tens of thousands of deaths. Many more people could be protected from flu if more people got vaccinated.

*References for the studies listed above tin be found at Publications on Flu Vaccine Benefits. Also, come across the A Strong Defence force Against Flu: Get Vaccinatedpdf icon ! fact sheet.

Vaccine Match

What is meant by a "good match" between viruses in the vaccine and circulating influenza viruses?

A "skillful match" is said to occur when the flu vaccine viruses used to produce influenza vaccine and the viruses circulating among people during a given flu season are "similar" one another such that the antibodies produced by vaccination protect against infection with circulating viruses.

What if circulating viruses and the vaccine viruses are different?

During seasons when one or more of the circulating viruses are different or "drifted" from the vaccine viruses, vaccine effectiveness against the drifted viruses tin can be reduced. Information technology's important to remember that flu vaccine protects against four unlike influenza viruses and multiple different viruses usually broadcast during any 1 season. Even if the effectiveness of the vaccine is reduced against one virus vaccination can still be effective at preventing influenza disease caused by the other circulating viruses. For these reasons, CDC continues to recommend flu vaccination for everyone 6 months and older even if vaccine effectiveness confronting one or more viruses is reduced.

Why is there sometimes not a good match between a vaccine virus and circulating viruses?

Flu viruses are constantly changing (chosen "antigenic drift") – they can change from one season to the next or they can fifty-fifty change within the course of ane flu season. Experts must pick which viruses to include in the vaccine many months in advance in society for vaccine to be produced and delivered on fourth dimension. (For more data about the vaccine virus selection process visit Selecting the Viruses in the Flu (Flu) Vaccine.) Because of these factors, there is e'er the possibility of a less than optimal match between circulating viruses and the viruses used to produce vaccine.

The production procedure for some seasonal vaccines also may touch on how well vaccine works confronting certain viruses, especially influenza A(H3N2) viruses. Growth in eggs is role of the product process for many seasonal influenza vaccines. While all influenza viruses undergo changes when they are grown in eggs, changes in influenza A(H3N2) viruses are more probable to result in antigenic changes compared with changes in other influenza viruses. These so-called "egg-adapted changes" are present in well-nigh of the vaccine viruses recommended for use in egg-based vaccine production and may reduce their effectiveness against circulating influenza viruses. Advances in vaccine production technologies (for example, cell-based and recombinant engineering) and advanced molecular techniques are being explored as ways to ameliorate flu vaccine effectiveness. Larn more by visiting, Advancements in Influenza Vaccines.

Volition this season's vaccine be a proficient lucifer for circulating viruses?

Information technology'southward not possible to predict with certainty if a flu vaccine will be like circulating flu viruses considering flu viruses are constantly changing. A flu vaccine is made to protect confronting the influenza viruses that research and surveillance indicate volition likely be almost common during the season. Over the course of flu flavor, CDC studies samples of circulating flu viruses to evaluate how shut a lucifer there is between viruses used to brand the flu vaccine and circulating influenza viruses. More information virtually the 2021-2022 flu season and recommended vaccines is available.

Vaccine Side Furnishings (What to Await)

Tin can a flu vaccine requite me flu?

No, a flu vaccine cannot cause influenza disease. Flu vaccines that are given with a needle (influenza shots) are currently made in two means: the vaccine is made either with a) influenza vaccine viruses that accept been killed (inactivated) and are therefore not infectious, or b) with proteins from a flu virus (which is the example for recombinant influenza vaccine). Nasal spray vaccine is made with weakened (attenuated) live flu viruses, and too cannot cause flu illness. The weakened viruses are cold-adjusted, which means they are designed to only reproduce at the cooler temperatures establish within the nose. The viruses cannot reproduce in the lungs or other areas where warmer temperatures exist.

What side effects tin occur later getting a influenza vaccine?

While a flu vaccine cannot requite y'all influenza illness, at that place are dissimilar side effects that may be associated with getting a flu shot or a nasal spray flu vaccine. These side effects are ordinarily mild and curt-lasting, especially when compared to symptoms of flu.

A flu shot: The viruses in a influenza shot are killed (inactivated), so yous cannot become influenza from a influenza shot. Some pocket-size side effects that may occur are:

• Soreness, redness, and/or swelling where the shot was given
• Headache (low grade)
• Fever
• Muscle aches
• Nausea
• Fatigue

The nasal spray: The viruses in the nasal spray vaccine are weakened and do non crusade severe symptoms ofttimes associated with influenza illness. In children, side effects from the nasal spray may include:

• Runny olfactory organ
• Wheezing
• Headache
• Vomiting
• Musculus aches
• Fever (low class)

In adults, side furnishings from the nasal spray vaccine may include:

• Runny nose
• Headache
• Sore pharynx
• Cough

If these problems occur, they begin soon after vaccination and ordinarily are mild and short-lived. A influenza shot, like other injections, can occasionally cause fainting. Tell your provider if you feel dizzy or take vision changes or ringing in the ears. As with whatsoever medicine, there is a very remote gamble of a vaccine causing a severe allergic reaction, other serious injury, or death. People who think that they have been injured past a flu vaccine tin can file a merits for compensation from the National Vaccine Injury Compensation Program (VICP)external icon .

More information near the safety of flu vaccines is available at Flu (Flu) Vaccine Safety.

Vaccine Supply and Distribution

How much flu vaccine is projected to be bachelor for the 2021-2022 flu season?

Flu vaccine is produced past private manufacturers, so supply depends on manufacturers. Vaccine manufacturers have projected that they will supply the United States with every bit many as 188 one thousand thousand to 200 million doses of influenza vaccine for the 2021-2022 flavour. These projections may change as the flavour progresses. All influenza vaccines for the 2021-2022 season will exist quadrivalent (iv component). Most will exist thimerosal-free or thimerosal-reduced vaccine (87%) and about xviii% of influenza vaccines volition be egg-free.

Where can I find information about vaccine supply?

Data about vaccine supply is bachelor on CDC's Vaccine Supply & Distribution.

Special Consideration Regarding Egg Allergy

People with egg allergies tin receive any licensed, recommended age-advisable influenza vaccine (IIV4, RIV4, or LAIV4) that is otherwise advisable. People who have a history of severe egg allergy (those who have had whatever symptom other than hives after exposure to egg) should exist vaccinated in a medical setting, supervised by a health care provider who is able to recognize and manage severe allergic reactions. 2 completely egg-costless (ovalbumin-complimentary) flu vaccine options are available: quadrivalent recombinant vaccine and quadrivalent cell-based vaccine.

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Source: https://www.cdc.gov/flu/prevent/keyfacts.htm

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