Vaccine breakthrough is said to have occurred when a fully vaccinated person becomes infected with SARS-CoV-2 as confirmed by a PCR test and this person also experiences symptoms.

But it’s important to remember that vaccine breakthrough does not mean the vaccine has failed. Even when vaccine breakthrough does occur, the vaccination still prevents severe illness with COVID-19 in the vast majority of cases.

Further information about vaccine breakthrough is available from the Robert Koch Institute (RKI).

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