People more often are origin of infectious diseases in animals than vice versa, data suggest

New national data in France reveals that, by the World Health Organization (WHO) definition, the prevalence of long COVID is 4.0% in the French population overall and 8.0% among people who had COVID-19.

Among the 8.0%, the prevalence varied from 5.3% in men who had COVID-19, to 14.9% among the unemployed, and 18.6% of those with a history of hospitalization for COVID-19. The study is published in Clinical Microbiology and Infection.

The study is based on a cross-sectional survey of 10,615 participants conducted in August through November 2022. The WHO defines long COVID as "continuation or development of new symptoms 3 months after the initial SARS-CoV-2 infection, with these symptoms lasting for at least 2 months with no other explanation."

A total of 5,781 (54.5%) of study participants reported ever having a SARS-CoV-2 infection. Among those with lasting symptoms, fatigue was the most common, followed by sleep disorders, anxiety, and joint pain. According to the WHO definition, long COVID prevalence was 4.0% (95% confidence interval [CI], 3.6% to 4.5%) in the overall population.

Prevalence twice as high in women

"Prevalence was more than twice as high in women than in men and 68% higher in unemployed people; it was two to three times lower among elderly participants and lower among participants living alone," the authors wrote.

Prevalence was more than twice as high in women than in men and 68% higher in unemployed people.

Prevalence dropped to 2.4% when the WHO definition was strengthened with requiring at least moderate impact on daily activities (95% CI, 2.1% to 2.8%), and dropped further to 1.2% when the definition included only participants reporting strong or very strong impact of symptoms on daily activities.

More than half of those with WHO-defined long COVID were infected during the Delta wave, but the authors said ongoing surveillance of long COVID should take place. "Long COVID and especially the forms with a strong impact on daily activities will continue to represent a significant burden for the societies and healthcare systems of most countries, thus warranting ongoing surveillance," they concluded.