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SARS‑CoV‑2 belongs to the broad family of viruses known as coronaviruses. [28] It is a positive-sense single-stranded RNA (+ssRNA) virus, with a single linear RNA segment. Coronaviruses infect humans, other mammals, including livestock and companion animals, and avian species. [ 104 ]
[1] [2] [3] As of 17 February 2025, 777,368,165 [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.
The US Centers for Disease Control and Prevention is expanding its infectious disease surveillance program at four major US airports to more than 30 pathogens, including flu, RSV and other ...
A COVID-19 vaccine is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 . Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute ...
A year after omicron began its assault on humanity, the ever-morphing coronavirus mutant drove COVID-19 case counts higher in many places just as Americans gathered for Thanksgiving. Phoenix-area ...
Researchers rely on what are known as viral culture tests in which they take a swab of the coronavirus and see if they can grow the virus in the lab, as the best proxy for infectiousness.
The infection of new-born chicks was characterized by gasping and listlessness with high mortality rates of 40–90%. [16] Leland David Bushnell and Carl Alfred Brandly isolated the virus that caused the infection in 1933. [17] The virus was then known as infectious bronchitis virus (IBV).
A PNAS report in September 2020 confirmed that the virus is much more dangerous for the elderly than the young, noting that about 70% of all U.S. COVID-19 deaths had occurred to those over the age of 70. [94] As of early August 2020, among the 45 countries that had over 50,000 cases, the U.S. had the eighth highest number of deaths per-capita.