What can we expect from the 4th wave? How is vaccination changing the course of the pandemic? Infectious diseases scientist Volker Gerdts answers your COVID questions on \U0001d615\U0001d630 \U0001d615\U0001d630\U0001d62f\U0001d634\U0001d626\U0001d62f\U0001d634\U0001d626.