The CDC believes one in ten Americans will develop long-covid symptoms more than a month after infection. But there are problems with even these careful estimates
two years since the start of the covid-19 pandemic, scientists have learned a lot about how the SARS-CoV-2 virus affects the body. But the symptoms and complications known as “” are far less understood. America’s Centres for Disease Control and Prevention defines long covid as the continuation of symptoms for at least four weeks after infection. The World Health Organisation says it usually occurs three months after the onset of the virus and lasts for at least two months.
But there are problems with even these careful estimates. Fatigue and muscle ache could be caused by a number of other conditions. An earlier ONS study found that 5% of people infected with covid had at least one of 12 common symptoms 12 to 16 weeks after infection; 3.4% of a control group who had not been infected also reported one of these symptoms.
Confusingly, long covid may actually be a collection of quite different syndromes. For example, any encounter with an infectious disease can have serious long-term consequences. Covid can cause lingering or permanent damage to the lungs and heart. Some cases of long covid may really be “post-intensive care syndrome”, which can affect anyone who spends time in an intensive care unit. Sufferers face serious physical weakness, lung damage and problems with memory and attention.
Because so many people have caught covid, if even a tiny percentage suffer continuing health problems a huge public-health crisis could ensue. Some call it the pandemic after the pandemic. Pharmaceutical companies are pursuing trials of drugs
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