Reference
HIV infection and AIDS in Africa and the Third World
Kerr DL. J Sch Health. 1989 Oct;59(8):369-70. doi: 10.1111/j.1746-1561.1989.tb04749.x. PMID: 2811319 https://pubmed.ncbi.nlm.nih.gov/?term=Kerr+DL&cauthor_id=2811319
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Principles of Epidemiology
SARS-CoV-2 (COVID-19)
Biomedical Sciences