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These symptoms result from multiple different factors. SARS-Coronavirus-2 (SARS-CoV-2) directly infects olfactory neurons (smell) and nerve cells expressing taste receptors. Although these cells communicate directly with the brain, the virus does not exhibit strong infection of other nerve cells in the central nervous system.
Scientists named these variants after Greek letters: alpha, beta, gamma, delta and omicron. Delta, which became dominant in the U.S. in June 2021, raised a lot of concerns because it was twice as likely to lead to hospitalization as the first version of the virus. Then in late November 2021, a new variant came on the scene: omicron.
As of 7 December 2021 it was known that BA.2, unlike BA.1, lacks the characteristic S-gene target failure (SGTF) causing deletion (Δ69-70), by which many qPCR tests have been able to rapidly detect a case as an Omicron (or Alpha) variant, from the previously dominant Delta variant.
Other symptoms are less common among people with COVID-19. Some people experience gastrointestinal symptoms such as loss of appetite, diarrhea, nausea or vomiting. [1] [65] A June 2020 systematic review reported a 8–12% prevalence of diarrhea, and 3–10% for nausea. [2] Less common symptoms include chills, coughing out blood, diarrhea, and rash.
Pirola, or BA.2.86, is the latest Omicron strain to appear this summer, sparking concern among experts because it has 34 more mutations, which could make it easier to evade vaccines.
If you do get sick, drink plenty of fluids (especially liquids with electrolytes), get plenty of rest and only eat soft, bland foods. This article was originally published on Dec. 12, 2024 and has ...
COVID wastewater levels are trending steeply upward in the U.S. It may leave you wondering if your winter illness is because of humanity’s newest scourge or something different entirely.
People with the same infection may have different symptoms, and their symptoms may change over time. Three common clusters of symptoms have been identified: one respiratory symptom cluster with cough, sputum , shortness of breath, and fever; a musculoskeletal symptom cluster with muscle and joint pain, headache, and fatigue; a cluster of ...