Is increased mortality by multiple exposures to COVID-19 an overseen factor when aiming for herd immunity? oleh Kristina Barbara Helle, Arlinda Sadiku, Girma Mesfin Zelleke, Toheeb Babatunde Ibrahim, Aliou Bouba, Henri Christian Tsoungui Obama, Vincent Appiah, Gideon Akumah Ngwa, Miranda Ijang Teboh-Ewungkem, Kristan Alexander Schneider