A person vaccinated against COVID-19 can still get infected with the virus and transmit it to others.

A fully vaccinated person can have a breakthrough infection and transmit the virus, but low probability.

A fully vaccinated person can have a breakthrough infection and transmit the virus, but low probability.The rising number of breakthrough infections has once again raised questions over the efficacy of vaccines in preventing the spread of the virus. The Centers for Disease Control and Prevention has reported that breakthrough infections occur more frequently due to waning immunity and highly contagious delta variant. The number of cases has risen dramatically in the U.S. driven by the Delta variant. The CDC has also revised its guidance on masking and urges vaccinated people to wear masks in indoor public places.

Though COVID-19 vaccines are effective against virus variants, including Delta, there is a chance of fully vaccinated people getting infected. There is also a possibility of spreading the virus to others. At the same time, it is important to note that COVID-19 vaccines offer good protection from severe disease and deaths. The infection tends to be mild, and there's less density of the virus in a fully vaccinated person, which means less risk that the virus will be transmitted to somebody else.

The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19, including symptoms, prevention, and available treatment, please refer to the World Health Organization or your national healthcare authority.