COVID-19 infection and vaccination in immunodeficiency.

During the last 2 years and a half, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide, causing about 6 million deaths. Clinical manifestations are highly variable, ranging from entirely asymptomatic infection to multiorgan failure and death. The outcome in immunocompromised patients is still a matter of debate, and so are the optimal strategies to prevent or treat the infection in these high-risk populations.