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Homechevron_rightSciencechevron_rightStudy shows long Covid...

Study shows long Covid symptoms can appear months after infection

Study shows long Covid symptoms can appear months after infection

New York: According to the most thorough examination of how symptoms develop over a year, Long Covid can linger for at least a year or manifest months after the acute disease has subsided.

Long Covid is characterised by a variety of symptoms that last or appear around a month after the original infection. These symptoms are linked to severe morbidity or a lower quality of life.

For about 16 per cent of the Covid-positive people, symptoms lasted for at least a year, but for others, they came and went.

The study appears in the US Centers for Disease Control and Prevention's (CDC) latest Morbidity and Mortality Weekly Report (MMWR).

"It was common for symptoms to resolve then re-emerge months later," said lead author Juan Carlos Montoy, Associate Professor at University of California’s Department of Emergency Medicine.

"A lot of prior research has focused on symptoms at one or two points in time, but we were able to describe symptom trajectory with greater clarity and nuance. It suggests that measurements at a single point in time could underestimate or mischaracterised the true burden of disease," Montoy said.

The study assessed symptoms every three months, enabling researchers to differentiate between symptoms that improve and those that emerge months after the initial infection.

It involved 1,741 participants -- two-thirds of them female.

Three-quarters tested positive for Covid, but those who tested negative may also have had an infection of some type since they were experiencing symptoms. These included fatigue, runny nose, headache, sore throat, shortness of breath, chest pain, diarrhoea, forgetfulness and difficulty thinking or concentrating.

Covid positive participants were more likely to have symptoms in each of the symptom categories at baseline, but by the end of the year, there was no difference between those who were Covid-positive and negative.

"We were surprised to see how similar the patterns were between the Covid positive and Covid negative groups," said Montoy.

"It shows that the burden after Covid may be high, but it might also be high for other non-Covid illnesses. We have a lot to learn about post-illness processes for Covid and other conditions."

With inputs from IANS

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