Though currently approved COVID-19 vaccines effectively provide immunity against the virus, it's unclear how long that protection will last.
People who haven't gotten vaccinated for COVID-19 often have complex reasons for their relunctance or may face other barriers. Lumping them all together undercuts the vaccination campaign.
The high costs of the world's colossally unequal COVID-19 immunization rates.
Various companies use different ingredients and different delivery systems in their COVID-19 vaccines. Researchers are investigating whether it's better for individuals to mix what's available.
Vaccinated people can still get infected with the coronavirus. So if you have symptoms of COVID-19, getting tested can protect others and help health officials keep an eye on the virus.
The COVID-19 vaccines are a smash success. But that doesn't mean they keep every vaccinated person completely free of the coronavirus.
Most shots work best when inserted into muscle. The shoulder muscle known as the deltoid works best.
The CDC first paused, then unpaused, the administration of the Johnson & Johnson COVID-19 vaccine due to concerns about blood clots. But what are those clots, and how do they form?
The CDC and FDA said the benefits of the Johnson & Johnson vaccine far outweigh the low risk of developing rare blood clots and lifted a pause on the vaccine's use. A doctor explains.
It's normal for different people to mount stronger or weaker immune responses to a vaccine, but post-shot side effects won't tell you which you are.
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