Consequences of the emergence and spread of SARS-CoV-2 variants of concerns BA.4 and BA.5 for the EU / EEA
Event background SARS-CoV-2 variants BA.4 and BA.5 were first detected in South Africa in January and February 2022. They became the dominant variants in this country in May 2022. [1] and a parallel growing trend in epidemiological indicators such as the number of reported cases and the positivity rate of tests [2]suggested that these two …