Flu Prevention for Adults and Older Adults

Influenza, commonly called the flu, is often treated as a seasonal inconvenience. For some adults, however, influenza can lead to significant complications, prolonged recovery, hospitalization, or worsening of an existing health condition.

The risk is particularly important in older adults.

According to the CDC, adults 65 and older experience the greatest burden of severe influenza illness during most flu seasons, partly because immune defenses change with increasing age. People with certain chronic conditions—including heart disease, lung disease, diabetes, and neurologic conditions—can also face increased risk of serious complications.

Flu prevention therefore involves more than simply avoiding someone who is sick. It includes vaccination, recognizing risk factors, reducing exposure, and knowing when medical evaluation or antiviral treatment may be appropriate.

Why Influenza Can Become More Serious With Age  

The immune system changes as people grow older.

This does not mean that every older adult will develop severe influenza. It means that, at a population level, adults 65 and older are more likely to experience complications than younger, otherwise healthy adults.

Influenza can contribute to complications such as:

• Pneumonia

• Worsening of chronic lung disease

• Worsening of cardiovascular conditions

• Dehydration

• Hospitalization

• Secondary infections

The CDC identifies adults 65 and older, along with people with certain chronic medical conditions, as groups at increased risk for serious flu complications.

This is why prevention becomes particularly important when someone is older or has underlying health conditions.

Annual Flu Vaccination Remains the Foundation of Prevention  

The CDC recommends annual influenza vaccination for everyone 6 months and older, unless there is a contraindication.

Vaccination is considered the primary preventive measure because it can reduce the risk of influenza illness and can also reduce the severity of illness when vaccinated people become infected.

Flu viruses change over time, and vaccine composition is updated accordingly.

For the 2026–2027 U.S. influenza season, CDC guidance continues to recommend annual vaccination and the use of trivalent influenza vaccines.

What Changes After Age 65?  

There is an important difference in the CDC recommendation for older adults.

For people 65 years and older, CDC and its Advisory Committee on Immunization Practices (ACIP) preferentially recommend one of three vaccine types:

• High-dose inactivated influenza vaccine

• Recombinant influenza vaccine

• Adjuvanted inactivated influenza vaccine

These vaccines are preferred because available evidence suggests they may provide greater benefit for this age group than standard-dose, unadjuvanted influenza vaccines.

However, there is an important practical point:

If one of the preferentially recommended vaccines is not available, an appropriate alternative influenza vaccine should still be given rather than delaying vaccination solely to wait for a preferred product.

The choice of vaccine should also take into account the individual's age, health conditions, allergies, previous vaccine reactions, and other clinical considerations.

When Should Adults Get the Flu Vaccine?  

CDC recommends that vaccination ideally occur by the end of October for most people.

However, vaccination after October can still be beneficial as long as influenza viruses are circulating and vaccine is available.

This is particularly relevant because influenza activity does not begin and end on exactly the same date every year.

For older adults, timing can also matter because vaccine-induced protection can decline over time. CDC's guidance therefore discourages routinely vaccinating most adults 65 and older very early in July or August when it could result in reduced protection later in the season.

Vaccination Does Not Mean You Cannot Get the Flu  

No influenza vaccine provides perfect protection.

Vaccine effectiveness varies from season to season and can depend on factors including the influenza viruses circulating that year and how closely they match the vaccine viruses.

But vaccination can still reduce the risk of influenza illness and, importantly, can reduce the severity of illness and the risk of serious outcomes.

CDC notes that vaccination remains beneficial even when circulating viruses differ from those represented in the vaccine.

This is an important distinction:

The purpose of vaccination is not to guarantee that influenza infection can never occur.

It is to reduce the overall risk and potential severity of influenza.

Prevention Does Not Stop With Vaccination  

Vaccination is central, but everyday precautions can also reduce exposure.

Avoid Close Contact With People Who Are Sick  

Influenza spreads primarily through respiratory droplets and particles when infected people cough, sneeze, talk, or breathe.

If someone in the household is sick, reducing unnecessary close contact can help limit exposure.

Stay Home When You Are Sick  

If you develop influenza symptoms, avoiding close contact with others can reduce the chance of transmitting the infection.

This becomes especially important around:

• Older adults

• Infants

• Pregnant people

• People with chronic medical conditions

• People with weakened immune systems

Improve Indoor Air  

Respiratory viruses can spread more easily in crowded or poorly ventilated indoor environments.

When practical, improving ventilation and using cleaner indoor air strategies can reduce exposure to respiratory particles.

This can be particularly relevant during periods of increased respiratory-virus activity.

Practice Good Hand Hygiene  

Handwashing remains useful for reducing the spread of respiratory and other infectious diseases.

Wash hands with soap and water when available, particularly after coughing, sneezing, using shared objects, or returning from public settings.

If soap and water are unavailable, an alcohol-based hand sanitizer can be used when appropriate.

What About Masks?  

Mask use can be another tool for reducing respiratory-virus exposure, particularly in situations where someone is at higher risk or respiratory virus activity is elevated.

The benefit depends on factors such as the type and fit of the mask, how consistently it is worn, the environment, and the level of virus circulation.

Masks should therefore be viewed as one layer of prevention, not a replacement for vaccination or other appropriate precautions.

Chronic Conditions Can Change the Risk  

Influenza can be more complicated for people who already have certain health conditions.

CDC identifies increased risk among people with conditions including:

• Asthma

• Chronic obstructive pulmonary disease

• Heart disease

• Diabetes

• Neurologic conditions

• Kidney disease

• Liver disease

• Certain blood disorders

• Weakened immune systems

This does not mean that everyone with one of these conditions will experience severe influenza.

It means that prevention and timely evaluation become particularly important.

Know the Difference Between a Cold and Influenza  

Influenza can resemble other respiratory infections.

Common flu symptoms include:

• Fever or feeling feverish

• Cough

• Sore throat

• Muscle or body aches

• Headache

• Fatigue

• Chills

Not everyone with influenza develops a fever.

Because several respiratory viruses can cause similar symptoms, symptoms alone cannot always determine which virus is responsible.

Testing may sometimes be useful depending on the situation and the clinical decision being considered.

When Should You Contact a Healthcare Professional?  

Adults at higher risk of complications should not necessarily wait several days to see whether influenza becomes severe.

The CDC recommends prompt antiviral treatment for people at increased risk who have confirmed or suspected influenza. Antiviral medications work best when started within one to two days after symptoms begin, although treatment can still be beneficial later in some people, particularly those with severe or progressive illness or who are hospitalized.

This is particularly relevant for adults 65 and older.

The decision to use an antiviral medication should be made with a healthcare professional based on symptoms, timing, risk factors, contraindications, and other clinical considerations.

Antivirals Are Different From Antibiotics  

Influenza is caused by viruses.

Antibiotics treat bacterial infections and do not treat influenza.

Antiviral medications are specifically designed to act against influenza viruses.

CDC currently identifies several FDA-approved influenza antivirals, including oseltamivir, zanamivir, peramivir, and baloxavir, with their appropriate uses depending on age, medical circumstances, and timing.

The appropriate medication is not necessarily the same for every patient.

Why Early Treatment Can Matter  

Influenza can progress quickly in people at higher risk.

Starting antiviral treatment early can:

• Reduce the duration of illness

• Reduce symptom severity

• Help reduce certain complications

CDC recommends treatment as soon as possible for people with severe, complicated, or progressive influenza, people who require hospitalization, and people at increased risk of serious complications.

This is why waiting for symptoms to become severe before contacting a healthcare professional may not always be appropriate for a high-risk adult.

What Older Adults Should Watch For  

Influenza does not always present in exactly the same way in older adults as it does in younger people.

An older adult may experience substantial weakness, reduced appetite, worsening of an existing condition, or functional decline alongside respiratory symptoms.

Pay attention to meaningful changes such as:

• New or worsening shortness of breath

• Significant weakness

• Difficulty maintaining hydration

• Confusion or unusual changes in alertness

• Worsening of an existing heart or lung condition

• Symptoms that improve and then become worse again

These changes warrant appropriate medical attention.

Severe difficulty breathing, persistent chest pain or pressure, severe weakness, new confusion, or other emergency symptoms require urgent medical evaluation.

Flu Prevention Also Protects the People Around You  

Vaccination and infection-control measures have an additional benefit.

They can reduce the likelihood of transmitting influenza to people who may be more vulnerable to complications.

This includes:

• Older family members

• Young children

• People undergoing immune-suppressing treatment

• People with chronic medical conditions

CDC specifically emphasizes vaccination among healthcare workers and people who live with or care for individuals at higher risk.

Prevention therefore has both an individual and community dimension.

What Can Adults Do Before Flu Season?  

A practical prevention plan can include:

Review Your Vaccination Status  

Determine whether you are due for your annual influenza vaccine.

Know Your Risk Factors  

Understand whether age, chronic conditions, medications, or immune status place you at increased risk.

Keep Your Healthcare Information Current  

Know which medications you take and which health conditions may affect treatment decisions.

Have a Plan for Symptoms  

Know whom to contact if influenza symptoms develop.

Avoid Delaying Care if You Are High Risk  

Early discussion about antiviral treatment can be important because these medicines work best when started promptly.

Protect Vulnerable Household Members  

Use appropriate infection-control measures if someone in the household becomes sick.

Flu Prevention Is Part of Healthy Aging  

For older adults, preventing influenza is not simply about avoiding several uncomfortable days.

A significant respiratory infection can temporarily reduce:

• Strength

• Mobility

• Appetite

• Exercise tolerance

• Independence

Recovery may also take longer when an infection occurs alongside existing chronic conditions.

That is why influenza prevention fits naturally into a broader healthy-aging strategy.

Maintaining vaccinations, staying physically active, managing chronic conditions, eating adequately, getting appropriate sleep, and seeking timely medical care can all contribute to maintaining health and function through the respiratory-virus season.

A Simple Flu-Season Checklist  

Before flu season:

• Check your annual flu vaccination status.

• Review your health conditions and medications.

• Discuss your individual influenza risk with your healthcare professional.

• Know which symptoms should prompt a call.

During flu season:

• Wash your hands regularly.

• Avoid unnecessary close contact with people who are sick.

• Improve indoor ventilation when practical.

• Consider additional precautions in higher-risk settings.

• Stay home when you are sick.

If symptoms develop:

• Pay attention to when symptoms began.

• Contact a healthcare professional promptly if you are at higher risk.

• Ask whether antiviral treatment is appropriate.

• Seek urgent care for severe or rapidly worsening symptoms.

Conclusion  

Influenza prevention becomes increasingly important with age, but it does not need to be complicated.

For most adults, the foundation is annual vaccination, sensible infection-control practices, and timely attention to symptoms.

For adults 65 and older, CDC specifically recommends preferential use of certain higher-dose, recombinant, or adjuvanted influenza vaccines, reflecting the greater risk of serious influenza complications in this age group.

For people at higher risk who develop suspected or confirmed influenza, prompt discussion with a healthcare professional about antiviral treatment can also be important.

The goal is not to eliminate every possibility of infection.

It is to reduce preventable risk, recognize illness early, and protect health and function throughout the flu season.

Trusted References  

• Centers for Disease Control and Prevention (CDC) — Preventing Seasonal Flu.

• CDC — Flu and People 65 Years and Older.

• CDC / Advisory Committee on Immunization Practices (ACIP) — 2026–2027 Influenza Vaccine Clinical Considerations.

• CDC — Key Facts About Seasonal Flu Vaccine.

• CDC — People at Increased Risk for Flu Complications.

• CDC — Treating Flu With Antiviral Drugs, June 2026.

• CDC — About Influenza Antiviral Medications.