Before revision: Some of these include the 1957–1958 influenza pandemic, the Hong Kong flu of 1968–1969, the 1977–1979 Russian flu, the HIV/AIDS epidemic (1981–present), the SARS outbreak of 2002–2004, the swine flu pandemic of 2009–2010, and the COVID-19 pandemic (2019– present ).
After revision: Some of these include the 1957–1958 influenza pandemic, the Hong Kong flu of 1968–1969, the 1977–1979 Russian flu, the HIV/AIDS epidemic (1981–2022), the SARS outbreak of 2002–2004, the swine flu pandemic of 2009–2010, and the COVID-19 pandemic (2019– present ).