RSV vaccines are considered safe for seniors, with a side effect profile similar to other routine adult vaccines. The CDC recommends a single dose for all adults 75 and older, and for adults 50 to 74 who have conditions that raise their risk of severe RSV illness. Two vaccines are currently approved for this age group, and both went through large clinical trials before licensure.
Common Side Effects
The most frequently reported side effects are what you’d expect from any vaccine: soreness at the injection site, fatigue, headache, muscle pain, and joint pain. These reactions are typically mild to moderate and resolve within a day or two. In clinical trials, the rate of serious adverse events was similar between people who received the vaccine and those who received a placebo, meaning the vaccine itself didn’t meaningfully increase the risk of a serious medical event.
The Guillain-Barré Concern
The one safety signal that drew attention early on involves Guillain-Barré syndrome (GBS), a rare neurological condition where the immune system temporarily attacks the nerves, causing weakness and sometimes numbness. Post-marketing surveillance found that GBS following RSV vaccination is rare, occurring in fewer than 10 cases per million doses. For context, GBS is also a known rare complication of several common infections, including RSV infection itself. This risk was significant enough for regulators to flag, but rare enough that advisory committees still concluded the benefits outweighed the harms for the recommended groups.
Why Seniors Are Recommended the Vaccine
RSV is not just a childhood illness. It causes roughly 60,000 to 160,000 hospitalizations and 6,000 to 10,000 deaths each year among adults 65 and older in the United States. Those numbers rival influenza in a bad flu season. Unlike a cold that passes in a week, RSV in older adults can trigger pneumonia, worsen heart failure, and lead to lengthy hospital stays.
The vaccine is recommended universally starting at age 75 because the risk of severe illness rises steeply with age. For adults between 50 and 74, the recommendation applies if you have one or more conditions that make RSV more dangerous. These include:
- Chronic heart disease such as heart failure or coronary artery disease (high blood pressure alone doesn’t count)
- Chronic lung conditions like COPD, emphysema, or asthma
- Kidney disease requiring dialysis or other replacement therapy
- Complicated diabetes with kidney damage, nerve damage, or requiring insulin
- Neurologic conditions that weaken respiratory muscles or impair swallowing
- Liver disease such as cirrhosis
- Severe obesity with a BMI of 40 or higher
- Moderate or severe immune compromise
- Living in a nursing home
You don’t need medical records to prove you qualify. The CDC’s guidance states that your own report of a risk factor is sufficient, and vaccinators should not turn you away for lack of documentation.
Getting It Alongside Flu or COVID Shots
A large meta-analysis looking at co-administration found that giving an RSV vaccine at the same visit as a flu vaccine, or a COVID vaccine alongside a flu vaccine, did not change the safety or effectiveness of either shot. Immune responses and side effects were similar whether the vaccines were given together or separately. This matters practically because it means you can get your RSV shot during the same pharmacy or clinic visit where you get your annual flu vaccine, rather than scheduling a separate trip.
Post-Marketing Surveillance So Far
Since the vaccines became available in mid-2023, federal safety monitoring systems have been tracking reports in real time. Through December 2024, the Vaccine Adverse Event Reporting System logged 53 reports mentioning death, with sudden cardiac death being the most frequently cited cause. These reports don’t establish that the vaccine caused the deaths. The reporting system captures any health event that follows vaccination, and in a population of seniors who already have high baseline rates of cardiac events, some of those events will happen by coincidence in the days or weeks after any injection. Federal epidemiologists use separate, more rigorous databases to determine whether death rates actually exceed what would be expected without vaccination, and so far the overall safety profile has not changed the CDC’s recommendation.
The Guillain-Barré signal remains the most clearly identified rare risk. No new safety concerns beyond what was flagged during clinical trials have led to changes in the vaccine’s recommended use.
What to Expect When You Get It
The RSV vaccine is a single dose. Unlike flu shots, you don’t need one every year. You’ll get one injection in your upper arm, and most people feel fine within 48 hours. If you do experience soreness or fatigue, it typically peaks the day after vaccination and fades quickly. There’s no live virus in either approved vaccine, so it cannot give you RSV.
If you’re 75 or older, the decision is straightforward: the vaccine is recommended for you. If you’re between 50 and 74, it comes down to whether you have any of the risk factors listed above. For most seniors, the math favors vaccination. RSV sends tens of thousands of older adults to the hospital every year, and the vaccine’s serious side effects, while real, are exceedingly rare.