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This is a general overview and status of places affected by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus which causes coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 were identified in Wuhan, the capital of the province of Hubei in China in December 2019. It ...
The first description of epidemiological curves from the COVID-19 pandemic showed the pattern of a "mixed outbreak". According to the investigators, there was likely a continuous common source outbreak at Wuhan Seafood Market in December 2019, potentially from several zoonotic events. As of the date of publication of the study, it is unknown ...
By convention, a communicable disease outbreak is declared over when a period of twice the incubation period of the infectious disease has elapsed without identification of any new case, however, for organisms with a short incubation period (e.g. fewer than ten days), a period of three times the incubation period is preferred. [11]
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]
As is common with infections, there is a delay, or incubation period, between the moment a person first becomes infected and the appearance of the first symptoms. The median delay for COVID-19 is four to five days [17] possibly being infectious on 1–4 of those days. [18]
The pattern is different from that of last year, Cohen said, when the three viruses "all seemed to peak around the same time." After an early start in October 2022, flu infection rates topped off ...
During a two-week period ending Feb. 3, JN.1 made up 93.1% of cases in the U.S., up from 87% during the previous two-week period ending on Jan. 20, according to the CDC. This was a steep increase ...
As of March 2024, the Centers for Disease Control and Prevention no longer advises a five-day isolation period when you test positive for COVID-19, but recommends taking other precautions once ...
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