A warning circulating online claims that people vaccinated against COVID-19 may face a serious health risk. Such headlines can be alarming, particularly when they are presented without the rest of the sentence or without identifying the scientific evidence behind the claim.
he important point is that COVID-19 vaccination does not provide absolute protection against infection. Vaccinated people can still contract SARS-CoV-2, particularly as the virus evolves and immunity changes over time. However, that fact should not be confused with evidence that COVID-19 vaccination itself causes widespread or unexplained illness.
Current evidence from the World Health Organization shows that COVID-19 vaccines continue to provide protection against severe disease and death, while health authorities continue to monitor vaccine safety and update recommendations as the virus evolves.
That distinction matters.
A headline saying that vaccinated people “may” experience something can be technically true while still giving readers a misleading impression if it leaves out the size of the risk, the evidence behind the claim, or the difference between correlation and causation.
Here is what people need to know.
Vaccinated People Can Still Get COVID-19
One of the most important facts about COVID-19 vaccination is that vaccination does not create an impenetrable barrier against infection.
SARS-CoV-2 continues to evolve. New variants can have characteristics that allow them to partially evade immunity generated by previous infection or vaccination.
The World Health Organization reported in May 2026 that several SARS-CoV-2 lineages were circulating globally and that the virus continued to evolve. WHO also noted that the available evidence supported continued vaccination, particularly for people at greatest risk of severe COVID-19.
This means that a vaccinated person can test positive for COVID-19.
That is not, by itself, evidence that the vaccine has failed.
The purpose of vaccination is not necessarily to guarantee that someone will never encounter the virus. Instead, vaccination can prepare the immune system to respond more effectively when infection occurs.
The distinction is particularly important when considering severe outcomes.
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