Getting vaccinated against COVID-19 provides important protection, but it does not create an absolute barrier against infection.
Some vaccinated people can still become infected with SARS-CoV-2 and develop COVID-19. These infections are commonly referred to as breakthrough infections. The important point is that vaccination continues to offer substantial protection against the most serious consequences of the disease. Organisation mondiale de la santé+1
So what does it mean if someone becomes sick after vaccination?
No COVID-19 vaccine provides 100% protection against infection.
According to the World Health Organization, vaccinated people can still become infected and may develop COVID-19. However, people who become infected after vaccination are much more likely to experience a milder illness, while protection against severe disease and death remains high. Organisation mondiale de la santé
This is an important distinction.
The primary goal of vaccination is not necessarily to guarantee that a person will never encounter the virus. One of its most important benefits is reducing the likelihood that an infection will become severe.
The immune protection created by vaccination can change over time.
WHO reports that protection against severe disease and death is highest during the first few months after vaccination and then decreases. Protection can also vary according to individual factors and circulating virus variants. Organisation mondiale de la santé+1
This doesn't mean the vaccine has "failed."
Rather, it reflects how respiratory viruses and immune protection work.
A vaccinated person who develops COVID-19 may experience symptoms such as:
Symptoms can vary considerably from one person to another. Organisation mondiale de la santé
Some people may have very mild symptoms, while others can become seriously ill.
The fact that breakthrough infections occur should not be interpreted as evidence that COVID-19 vaccines provide no benefit.
WHO states that COVID-19 vaccines continue to provide strong protection against severe illness and death. Organisation mondiale de la santé
That is why vaccination remains particularly important for people at higher risk of severe COVID-19, including older adults and people with certain underlying conditions or weakened immune systems.
If you develop symptoms that could be COVID-19, don't assume that vaccination means you cannot have the infection.
Consider testing according to local health guidance, particularly if you are at increased risk of severe illness or have been exposed to someone with COVID-19.
If you're sick, staying home and limiting close contact with others can help reduce the chance of spreading the virus. WHO also recommends appropriate masking when symptomatic and around others, along with good ventilation and respiratory hygiene. Organisation mondiale de la santé
Most infections do not require emergency treatment, but certain symptoms should never be ignored.
Seek urgent medical attention if you develop difficulty breathing, significant chest pain or pressure, or other severe symptoms. Organisation mondiale de la santé
People at higher risk of severe disease should also contact a healthcare professional promptly when they become ill because treatment decisions may depend on how soon symptoms began and on individual risk factors.
Being vaccinated does not mean you can never catch COVID-19.
It means your immune system has additional protection against the disease's most serious outcomes.
Breakthrough infections can happen, particularly as immunity changes over time and the virus continues to evolve. But current evidence and WHO guidance continue to show that vaccination provides meaningful protection against severe COVID-19, hospitalization, and death. Organisation mondiale de la santé+1
So if a vaccinated person becomes ill, there is no reason to assume the vaccine "didn't work."
Protection is not the same as perfection—and preventing severe illness remains one of the most important benefits of COVID-19 vaccination. :::
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