What are the “breakthrough” cases of the COVID-19 vaccine?

What are the “breakthrough” cases of the COVID-19 vaccine?

It is when a fully vaccinated person becomes infected with the coronavirus. A small number of such cases are expected, and health officials say they are not the cause of vigilance.

The COVID-19 vaccine works by teaching the body to recognize the virus. Therefore, if you are exposed to it after vaccination, your immune system should be ready to take action and fight it.

In the study, a double dose of COVID-19 vaccine by Pfizer and Moderna was about 95% effective in preventing disease, and a single dose of Johnson & Johnson was 72% effective, but a direct comparison should be made. Is difficult. Therefore, vaccines are very good at protecting us from viruses, You can get a mild or asymptomatic infection or get sick.


If you get sick after being vaccinated, experts say shots are very good at reducing the severity of the illness, which is the main reason for getting vaccinated.

Dr. William Moss, a vaccine expert at the Johns Hopkins Bloomberg School of Public Health, said most people with breakthrough infections are experiencing mild illness.

In the United States, unvaccinated people account for almost all COVID-19 hospitalizations and deaths.

It is difficult to determine why a particular breakthrough case occurs. According to Moss, the amount of virus you are exposed to can be a factor. Our individual immune system also affects how well we respond to shots. For example, some people are in good health or are taking drugs that may reduce the response of the immune system to the vaccine.


People may have been exposed to the virus before the shot was fully effective. Although unlikely, Moss said he may have been given an improperly stored or administered dose.

Although previous evidence shows that vaccines used in the United States prevent them, the US Centers for Disease Control and Prevention says mutations may be a factor in some breakthrough cases. I’m pointing out.

Health officials are also monitoring signs of an increase in breakthrough cases. This may indicate that vaccine protection is declining and booster immunization is needed.


AP answers questions about this series of coronaviruses. Please submit at FactCheck@AP.org. Click here for details:

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What are the “breakthrough” cases of the COVID-19 vaccine?

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