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Taking precautions to protect yourself from a quartet of infectious diseases can lessen your odds of starting off 2025 sick. Public health experts are warning of a ‘quad-demic’ this winter.
[21] [22] According to the World Health Organization, approximately 10 million new TB infections occur every year, and 1.5 million people die from it each year – making it the world's top infectious killer (before COVID-19 pandemic). [21] However, there is a lack of sources which describe major TB epidemics with definite time spans and death ...
[1] [2] [3] As of 21 January 2025, 777,309,629 [4] cases have been stated by government agencies from around the world to be confirmed. Of the 248 recognized countries and territories around the world, 229 have reported cases of COVID-19 [5]. For more international statistics in table and map form, see COVID-19 pandemic by country and territory.
Within three months, the virus had spread throughout the continent, as Lesotho, the last African sovereign state to have remained free of the virus, reported a case on 13 May 2020. [37] [38] By 26 May, it appeared that most African countries were experiencing community transmission, although testing capacity was limited. [39]
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Mild illnesses in humans include some cases of the common cold (which is also caused by other viruses, predominantly rhinoviruses), [1] [2] while more lethal varieties can cause SARS, MERS and COVID-19. [3] [4] As of 2021, 45 species are registered as coronaviruses, [5] whilst 11 diseases have been identified, as listed below.
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See also Comparison of computer viruses. This is an alphabetical list of biological virus families and subfamilies; it includes those families and subfamilies listed by the ICTV 2023 report. [1] For a list of individual species, see List of virus species. For a list of virus genera, see List of virus genera.