Global Statistics

All countries
240,188,856
Confirmed
Updated on October 14, 2021 1:43 pm
All countries
215,765,598
Recovered
Updated on October 14, 2021 1:43 pm
All countries
4,893,161
Deaths
Updated on October 14, 2021 1:43 pm
Saturday, October 16, 2021

Global Statistics

All countries
240,188,856
Confirmed
Updated on October 14, 2021 1:43 pm
All countries
215,765,598
Recovered
Updated on October 14, 2021 1:43 pm
All countries
4,893,161
Deaths
Updated on October 14, 2021 1:43 pm
Molderizer and Safe Shield

Explainer: What researchers say about the long-term effects of COVID-19

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Medical workers treat patients suffering from the coronavirus disease (COVID-19) at Batajnica COVID-19 hospital in Belgrade, Serbia, October 4, 2021. REUTERS/Marko Djurica/File Photo

NEW YORK, Oct 7 (Reuters) – The World Health Organization (WHO) this week issued a definition for “long COVID,” a term used to describe the persistent health problems that affect some survivors of COVID-19. Scientists are still working to understand the syndrome. Here is what they know so far.

HOW DOES THE WHO DEFINE LONG COVID?

The WHO defines long COVID as a condition with at least one symptom that usually begins within three months from the onset of confirmed or probable infection with the coronavirus, persists for at least two months, and cannot be explained by another diagnosis. Symptoms may start during the infection or appear for the first time after the patient has recovered from acute illness.

Among the most common persistent symptoms are fatigue, shortness of breath, and cognitive problems. Others include chest pain, problems with smell or taste, muscle weakness and heart palpitations. Long COVID generally has an impact on everyday functioning.

The WHO’s definition may change as new evidence emerges and as understanding of the consequences of COVID-19 continues to evolve. A separate definition may be applicable for children, the agency said.

HOW COMMON IS LONG COVID?

The exact number of affected people is not known. A study from Oxford University of more than 270,000 COVID-19 survivors found at least one long-term symptom in 37%, with symptoms more frequent among people who had required hospitalization.

A separate study from Harvard University involving more than 52,000 COVID-19 survivors whose infections had been only mild or asymptomatic suggests that long COVID conditions may more often affect patients under age 65.

More than 236 million infections caused by the coronavirus have been reported so far, according to a Reuters tally.

WHAT ELSE DO STUDIES SHOW ON LONG COVID SYMPTOMS?

In a study published in the Lancet, Chinese researchers reported that 12 months after leaving the hospital, 20% to 30% of patients who had been moderately ill and up to 54% of those who were critically ill were still having lung problems.

The Harvard study also found that new diagnoses of diabetes and neurological disorders are more common among those with a history of COVID-19 than in those without the infection.

DO PEOPLE RECOVER FROM LONG COVID?

Many symptoms of long COVID resolve over time, regardless of the severity of initial COVID-19 disease. The proportion of patients still experiencing at least one symptom fell from 68% at six months to 49% at 12 months, according to the study published in the Lancet.

The WHO said long COVID symptoms can change with time and return after showing initial improvement.

DO COVID-19 VACCINES HELP WITH LONG COVID?

Small studies have suggested that some people with long COVID experienced improvement in their symptoms after being vaccinated. The U.S. Centers for Disease Control and Prevention said more research is needed to determine the effects of vaccination on post-COVID conditions.

Reporting by Manojna Maddipatla; Editing by Nancy Lapid, Caroline Humer and Bill Berkrot

Our Standards: The Thomson Reuters Trust Principles.



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