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The Delta variant (B.1.617.2) was [3] [4] a variant of SARS-CoV-2, the virus that causes COVID-19. It was first detected in India on 5 October 2020. It was first detected in India on 5 October 2020. The Delta variant was named on 31 May 2021 and had spread to over 179 countries by 22 November 2021.
A study of samples collected in Manaus between November 2020 and January 2021, indicated that the Gamma variant is 1.4–2.2 times more transmissible and was shown to be capable of evading 25–61% of inherited immunity from previous coronavirus diseases, leading to the possibility of reinfection after recovery from an earlier COVID-19 ...
Symptoms of COVID-19. Some less common symptoms of COVID-19 can be relatively non-specific; however the most common symptoms are fever, dry cough, and loss of taste and smell. [1] [22] Among those who develop symptoms, approximately one in five may become more seriously ill and have difficulty in breathing.
The most recent COVID-19 vaccine should offer protection against the XEC variant, Russo says. “The most recent version of the vaccine seems to be reasonably well-matched,” he says.
KP.3.1.1 is still the dominant COVID-19 variant in the United States as it accounts for nearly 60% of positive cases, but the new XEC variant is not far behind, recent Centers for Disease Control ...
The symptoms of COVID-19 are often indistinguishable from those caused by other viruses spreading right now, the experts note. These include respiratory syncytial virus (RSV), influenza and ...
Symptoms of Coronavirus (COVID-19) Image title: 316475: Author: CDC: Software used: Adobe InDesign 15.0 (Windows) Conversion program: Adobe PDF Library 15.0: Encrypted: no: Page size: 612 x 792 pts (letter) Version of PDF format: 1.4
Neither the WHO nor the CDC collects regular data on how Covid symptoms are evolving over time, so it's hard to assess whether infections are presenting differently. However, doctors say they ...