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The transmission of COVID-19 is the passing of coronavirus disease 2019 from person to person. COVID-19 is mainly transmitted when people breathe in air contaminated by droplets/aerosols and small airborne particles containing the virus. Infected people exhale those particles as they breathe, talk, cough, sneeze, or sing.
SARS-CoV-2 is the seventh known coronavirus to infect people, after 229E, NL63, OC43, HKU1, MERS-CoV, and the original SARS-CoV. [105] Like the SARS-related coronavirus implicated in the 2003 SARS outbreak, SARS‑CoV‑2 is a member of the subgenus Sarbecovirus (beta-CoV lineage B). [106] [107] Coronaviruses undergo frequent recombination. [108]
A COVID-19 party (also called coronavirus party, corona party, and lockdown party) is a gathering held with the intention of catching or spreading COVID-19. It is a type of pox party where the intentional spread of disease is chosen to build up post-infection immunity.
[9] [10] In some cases, a known or suspected patient zero may be informally referred to as an index case for the purpose of a scientific study, such as the two-year-old boy in a remote village in Guinea who was thought to be the source of the largest Ebola virus outbreak in history, [2] [11] or an unknown one, such as the mysterious patient ...
Coronavirus diseases are caused by viruses in the coronavirus subfamily, a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, the group of viruses cause respiratory tract infections that can range from mild to lethal.
An asymptomatic carrier is a person or other organism that has become infected with a pathogen, but shows no signs or symptoms. [ 1 ] Although unaffected by the pathogen, carriers can transmit it to others or develop symptoms in later stages of the disease.
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Total confirmed cases of COVID-19 per million people [61] SARS-CoV-2 , a new strain of coronavirus , was first detected in the city of Wuhan, Hubei Province , China, in December 2019. [ 62 ] The outbreak was characterized as a Public Health Emergency of International Concern (PHEIC) between January 2020 and May 2023 by WHO.
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