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Four big things that I still don’t know about COVID after two years

The first case of COVID-19 began to appear in December 2019. James Martin / CNET
For the latest news and information about the coronavirus pandemic, Who When CDC website.

In December 2019, a group of patients in Wuhan, China, Began to experience unknown pneumonia Later identified as COVID-19, it rapidly covered the world with 227 million infections, resulting in More than 5 million dead ..

Since then, progress has been made relatively rapidly on SARS-CoV-2, the virus that causes COVID-19. Multiple effective vaccines Appearing in a year, it’s much faster than the usual 4, and even 10.And Pfizer has just received FDA approval for that. COVID antiviral drug Paxlovid states that pharmaceutical giants can reduce the risk of hospitalization or death from COVID-19 by up to 89%.

Infectious disease experts have filled many of the unknowns of COVID-19 and are now delta When Omicron variant.

But two years later, as the United States passes 800,000 deaths from COVID -And tens of millions of infectious diseases and hospitalizations-scientists are still struggling to answer some big questions. The details of COVID-19 are as follows. About the new Omicron variant And how to get Free home test kit ..And be sure to learn how to put your vaccine information card On your smartphone .. Why does COVID make some people more ill, including long COVIDs?

Virus headache, fever, Disorientation Nausea and vomiting, and even loss of taste and smell. Scientists continue to connect those who are likely to experience these consequences, but there is still no answer as to why some people experience serious illness and others do not.

Age is arguably the largest correlation of severe illness, Gigi Gronval , Senior scholar Johns Hopkins Center for Health Security , Told CNET. “But there is a 29-year-old child who died, a child who died, when all indications suggested that a mild illness should have been followed.”

Scientists are also trying to avoid “long COVID”, a series of symptoms that can last for weeks or months after the patient is first infected.who Issued the definition This includes a variety of protracted symptoms such as fatigue, dyspnea, insomnia, out of focus, anxiety, and depression, and the list continues to change. Still, the cause of the condition is not clear.

“Two years later, we don’t really understand long COVID, and we don’t know the prevalence of Omicron after vaccination,” said Bob Wachter, director of medicine at the University of California, San Francisco. Tweet on wednesday .. “It’s still difficult for millions of people, and it’s a long-standing concern for me when I think about the possibility of even receiving” mild “Omicron cases. “

Some common symptoms, such as loss of smell and taste, appear to be less common in Omicron, but Gronvall said, “I don’t know if that variant suffers from long COVID. I didn’t have enough time to tell. “ How long does immunity from the vaccine last with mutants like Omicron?

The first COVID-19 vaccine has arrived America a year ago , And the two most effective in the United States-from […]

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