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October 14, 2020 02:02 am

A Man Caught Coronavirus Twice -- and It Was Worse the Second Time

According to a study published in The Lancet Infectious Diseases, a man in the U.S. caught COVID-19 for a second time and had a worse bout of illness. MIT Technology Review reports: The 25-year-old man tested positive for the first time on April 18, after experiencing several weeks of symptoms including sore throat, cough, headache, nausea, and diarrhea. He felt fully recovered by April 27, and tested negative for the virus on both May 9 and 26. But just two days later, on May 28, he developed symptoms again, this time with fever and dizziness too. He tested positive on June 5 and needed to be hospitalized after his lungs were unable to get enough oxygen into his body, causing hypoxia and shortness of breath. He had no underlying health conditions. The man has now recovered. Being infected once does not mean you're protected from being infected again, even if such cases are still vanishingly rare, with just five identified out of nearly 40 million confirmed cases worldwide. That means people who have had covid-19 still need to stay vigilant, following the advice on social distancing, wearing face masks, and avoiding crowded, poorly ventilated spaces. This was not altogether unexpected: coronavirus experts warned us that other coronaviruses, such as the common cold, are seasonal. However, there are still many questions that researchers are racing to answer. How much protection does having covid-19 confer? Is that mainly through antibodies or T cells? How long does protection last? What does it mean for the medical treatments that are being developed, or for vaccines? Will we all require a yearly shot rather than a one-off vaccine, for example? If nothing else, this new case is a reminder of how much about this virus we still don't know.

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