COVID-19 severity and vaccine effectiveness in Malawi: A test-negative case-control study by Clara Sambani, Victor Chikwapulo, Regina Mankhamba, Tonny Muwonge, Mavuto Thomas, Baxter Salatiel, Edna Mandala, Leah Mbabazi, Suzan Nakasendwa, Rodgers R. Ayebare, Collins Mitambo, Matthew Kagoli, Mabvuto Chiwaula, Dzinkambani Kambalame, Triza Chirwa, Liness Chinyamunyamu, Tamrat Shaweno, Nebiyu Dereje, Tajudeen Raji, Francis Kakooza, Mosoka P. Fallah, Evelyn C. Banda, Abigail Kazembe, Mitch Matoga

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