The PubMed search was conducted using following search terms in December, 2020:
SARS-CoV-2: (((COVID[Title/Abstract]) OR (COVID-19[Title/Abstract])) OR (SARS-CoV-2[Title/Abstract])) AND (("2020/Ma"[Date - Publication] : "2020/Ma"[Date - Publication]))
HCV: (((HCV[Title/Abstract]) OR ("hepatitis C virus"[Title/Abstract])) AND (virus[Text Word])) AND (("2020/Ma"[Date - Publication] : "2020/Ma"[Date - Publication]))
HIV: (((HIV[Title/Abstract]) OR ("human immunodeficiency virus"[Title/Abstract])) AND (virus[Text Word])) AND (("2020/Ma"[Date - Publication] : "2020/Ma"[Date - Publication]))
Ebola: ((Ebola[Title/Abstract]) AND (virus[Text Word])) AND (("Yb/Ma"[Date - Publication] : "Yb/Ma"[Date - Publication]))
Zika: ((ZIKA[Title/Abstract]) AND (virus[Text Word])) AND (("Yb/Ma"[Date - Publication] : "Yb/Ma"[Date - Publication]))
a M represents the month of search. For example, January is 01.