Logan Reed
The duration of vaccine effectiveness varies depending on the type of vaccine and individual factors. For the COVID-19 vaccine, the CDC recommends that most adults ages 18 and older receive the 2024-2025 vaccine. Additionally, it is advised to wait at least three months after recovering from COVID-19 before getting the vaccine. Experts estimate that the updated COVID-19 vaccines will provide protection for up to four to six months. In the case of the flu vaccine, it is recommended to get vaccinated around September or October, as flu cases typically peak in the following months, and vaccine protection decreases after a few months.
| Characteristics | Values |
|---|---|
| Flu vaccine protection duration | Decreases after a few months |
| Flu vaccine availability | From August or July |
| Flu vaccine recommendation | September and October |
| Flu vaccine effectiveness | 41-78% effective against hospitalization |
| Flu vaccine effectiveness | 32-60% effective against infections requiring less intensive treatment |
| COVID-19 vaccine availability | Uncertain |
| COVID-19 vaccine approval | Limited to "high-risk" individuals |
| COVID-19 vaccine approval | People over the age of 65 |
| COVID-19 vaccine approval | People with certain underlying conditions |
| COVID-19 vaccine approval | High-risk children as young as 6 months |
| COVID-19 vaccine approval | High-risk children over the age of 5 |
| COVID-19 vaccine approval | High-risk children over the age of 12 |
| COVID-19 vaccine approval | Healthy individuals under the age of 65 |
| COVID-19 vaccine protection duration | 4-6 months |
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What You'll Learn
Flu vaccine efficacy varies yearly
Flu vaccine efficacy does vary yearly. The CDC conducts studies each flu season to determine how well flu vaccines are working. These vaccine effectiveness (VE) studies help to regularly assess the value of flu vaccination as a public health intervention. The results of these studies can vary based on the study design, the outcome(s) measured, the population studied, and the season studied.
The CDC's preliminary estimates for the last flu season found that the vaccines ranged from 41 to 78 percent effective against hospitalization, and 32 to 60 percent effective against infections requiring less intensive treatment. The VE estimates and associated confidence levels included in the CDC's report may reflect regional variations in circulating viruses. For example, in the United States, most subtyped influenza A specimens (67%) were influenza A(H3N2), which is generally associated with lower VE.
The efficacy of the flu vaccine also depends on how accurately health officials can predict which flu strains to target. Each year, they make educated guesses about which strains will circulate in the coming season, and the vaccine's efficacy depends on how accurate their predictions are. Even if you get the flu, being vaccinated can reduce the severity of your symptoms. Dr. Schaffner stated that "each year, millions of hospitalizations and thousands of deaths are prevented by vaccination."
While the flu vaccine's efficacy varies yearly, it is still worth getting vaccinated. Dr. Peter Chin-Hong, an infectious disease specialist, recommends getting the flu vaccine a little later in the year, as protection from the vaccine decreases after a few months, and flu cases typically peak in December, January, or February. Even if you miss the Halloween mark, Dr. Chin-Hong advises that "some protection is better than none."
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COVID-19 vaccine restrictions
The COVID-19 vaccines are safe and effective at preventing severe illness, hospitalisation, and death. The vaccines also offer protection against long COVID-19 and help prevent transmission of the virus by reducing the severity of symptoms.
The 2025-2026 COVID-19 vaccines have been approved by the FDA, but with new restrictions on who is eligible to receive them. The vaccines are now approved for adults aged 65 and over, and individuals aged 6 months to 64 years with at least one underlying condition that puts them at higher risk for severe COVID-19. These underlying conditions include diabetes, heart disease, asthma, kidney disease, cancer, and mental health disorders.
It is important to note that the CDC has stopped recommending COVID-19 vaccines for healthy pregnant women, although pregnancy is listed as a risk factor by the FDA. The FDA has also approved the Moderna vaccine for individuals aged 6 months and above, the Pfizer vaccine for those aged 5 and above, and the Novavax vaccine for individuals aged 12 and above.
The timing of the vaccine is also important. Since the effectiveness of vaccines wanes over time, individuals may want to time their vaccinations to ensure complete protection during the winter holiday season. The updated COVID-19 vaccines are expected to provide protection that lasts up to four to six months.
Physicians have the authority to prescribe COVID-19 vaccinations "off-label" to patients, but it may be more challenging for those who are not eligible to be vaccinated at a pharmacy. Several states are working to expand access to vaccines, and individuals should consult their local health department or free and charitable clinics for more information.
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Flu shot side effects
The flu vaccine, also known as the influenza vaccine, is a medication that helps protect people from the flu. It is recommended that the flu shot be administered every year, especially for people who are at high risk of developing serious complications from the flu. This includes individuals over six months of age, pregnant women, and those with weakened immune systems.
While the flu shot is generally safe, it can cause mild side effects in some individuals. These side effects are typically mild and last only a few days. Here are some of the most common side effects:
- Injection site reactions: soreness, redness, and swelling at the injection site. Applying pressure to the injection site can help reduce discomfort.
- Fatigue
- Headaches
- Muscle aches: Over-the-counter pain relievers like ibuprofen or acetaminophen can help ease the pain.
- Arm stiffness: Keeping the arm moving can help prevent stiffness as inactivity can increase soreness.
It is important to note that severe allergic reactions following vaccination are rare but can be life-threatening. If someone shows signs of a severe allergic reaction, such as hives, swelling of the face and throat, or difficulty breathing, immediate medical attention is necessary.
The benefits of the flu shot outweigh the temporary discomfort of potential side effects. It is an effective way to protect yourself and others from the flu and to help prevent severe illness, hospitalizations, and even death caused by the flu.
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COVID-19 vaccine for children
As of August 2025, the FDA has approved updated COVID-19 vaccines for the upcoming fall and winter season. However, these approvals come with limitations for specific populations, including children. Previously, the U.S. policy recommended an annual COVID-19 vaccine for all Americans aged 6 months and older. Now, the updated guidelines have restricted vaccine access for children, and the specific rules depend on the vaccine manufacturer.
Pfizer's COVID-19 vaccine, Comirnaty, is no longer authorized for children younger than 5. This change means that Pfizer's vaccine is now only available for children aged 5 and above. Moderna's Spikevax vaccine has also been approved for children aged 6 months and older, but only if they have an underlying health condition that puts them at higher risk of severe COVID-19. Novavax's COVID-19 vaccine is the only protein-based, non-mRNA vaccine available in the U.S., and it is approved for children aged 12 and older with at least one underlying condition that increases their risk of severe disease.
These restrictions on vaccine access for children have been met with criticism from some medical groups, including the American Academy of Pediatrics. They argue that the new limitations may create barriers to vaccination and block vaccine access for families who want to protect their young children from COVID-19. The American Academy of Pediatrics recommends that all children aged 6 months through 23 months should receive a COVID-19 vaccine unless they have known allergies to the vaccine or its ingredients.
Parents of children aged 6 months to 17 years are advised to discuss the benefits of vaccination with a healthcare provider. It is important to note that the COVID-19 vaccine helps protect individuals from severe illness, hospitalization, and death. While the duration of vaccine protection is not explicitly mentioned as being limited to 3 months, staying up to date with recommended vaccine doses is crucial to maintaining protection against COVID-19.
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Flu shot for pregnant people
The flu vaccine, also known as the influenza vaccine, is a medication that helps protect people from the flu. It is typically given by injection into the arm or sometimes the thigh muscle in adults and children over six months old. The flu vaccine does not contain any live viruses, so it cannot give you the flu. However, it is still possible to get the flu after being vaccinated, especially if the vaccine does not align with the circulating viruses during that flu season.
Pregnant women are more vulnerable to getting severely ill if they get respiratory illnesses like the flu. As a result, it is strongly recommended that pregnant women get both the flu and COVID-19 vaccines. Doctors and researchers have known for decades that complications from these illnesses during pregnancy can lead to early birth, premature birth, and other complications for the mother. The flu vaccine is safe for most pregnant people or those with a chronic health condition. It can be administered via injection or nasal spray, but those who are currently feeling sick should wait until they recover before getting the vaccine.
The flu vaccine is typically effective for one flu season, which usually spans from October to March in the northern hemisphere. This means that you need to get a flu shot every year, ideally in September, to ensure full protection during the upcoming flu season. However, getting the vaccine even as late as January is still better than not receiving it at all. While the flu vaccine is generally safe for most people, it is important to consult with a healthcare professional if you have any concerns or underlying health conditions.
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Frequently asked questions
The updated COVID-19 vaccines should provide protection that lasts up to four to six months. If you've had a COVID-19 vaccine recently or a COVID-19 infection, it is recommended to wait about three or four months before getting another shot to maximize the protection from each dose.
No, the protection from the flu vaccine decreases after a few months, and flu cases typically peak in December, January, or February. It is still worth getting vaccinated after October as some protection is better than none.
The duration of protection provided by vaccines varies depending on the type of vaccine and the individual's response. For example, the COVID-19 vaccine protection lasts for about four to six months, while the flu vaccine protection decreases after a few months. It is important to follow the recommended vaccination schedules to ensure optimal protection.
