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Incubation periods averaged about five days when the Alpha variant was dominant, about 4.5 days when Beta and Delta were dominant, and about 3.4 days once Omicron took over, according to a 2022 ...
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 researchers estimated that, in a group of 10,000 people who catch COVID-19 and will develop symptoms, about 101 would start showing symptoms after health officials had ceased monitoring them.
Unfortunately, severe cases of COVID-19 still happen, Dr. Russo says. With a severe case of COVID-19, a person may experience weakness, lethargy, and fever for a prolonged period of time.
Coronavirus disease 2019 (COVID-19, also known as SARS-2) is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. The symptoms of COVID‑19 can vary but often include fever, [7] fatigue, cough, breathing difficulties, loss of smell, and loss of taste.
Omicron variant symptoms may be different than previous Covid strains. Learn what you should know about Omicron symptoms and what to look out for. Omicron symptoms: What we know about illness ...
The COVID-19 virus has not been detected in drinking water. [82] Conventional water treatment (filtration and disinfection) inactivates or removes the virus. [82] COVID-19 virus RNA is found in untreated wastewater, [82] [22] [83] [a] but there is no evidence of COVID-19 transmission through exposure to untreated wastewater or sewerage systems ...
For some, COVID-19 symptoms may persist weeks to months after the initial infection. In 2022, 6.9% of US adults reported to have experienced long COVID, according to a CDC survey .