Long COVID Analysis Shows High Prevalence
Long COVID, a condition that can involve a range of symptoms following a COVID-19 infection, has been found to be quite common according to a recent global analysis featured in Open Forum Infectious Diseases.
Another investigation published in The Journal of Infectious Diseases looked into long COVID in adolescents during the summer of 2022. The findings indicated that while many teenagers reported ongoing symptoms, most were no longer present three months after infection.
In the initial analysis, covering 144 studies, researchers found that the overall prevalence of long COVID globally, as of May 2024, was 36% (95% confidence interval [CI], 33% to 40%). This condition remained consistent among individuals followed for 1 or 2 years, although the estimated prevalence varied significantly across different studies, ranging from as low as 3% to as high as 80% in those published last year.
For studies conducted in North America, the pooled prevalence was recorded at around 30% (95% CI, 24% to 38%).
Key Factors Linked to Long COVID
The analysis identified three primary factors associated with long COVID: being unvaccinated (odds ratio [OR], 2.09; 95% CI, 1.55 to 2.81, from 7 studies), infections caused by pre-Omicron variants (OR, 1.74; 95% CI, 1.40 to 2.17, from 6 studies), and being female (OR, 1.56; 95% CI, 1.32 to 1.84, from 33 studies).
Interestingly, studies that included only hospitalized patients reported higher rates of long COVID compared to those focused on individuals with milder cases.
The two symptoms most commonly reported as part of long COVID were memory issues and muscle weakness, each affecting about 11% of respondents.
“We emphasize that our pooled prevalence estimates indicate the percentage of individuals who have ever experienced long COVID symptoms during the study period, rather than those currently having symptoms,” the researchers noted. “Thus, our estimates might exaggerate the clinical implications of long COVID.”
Reduced Prevalence in Teens After Three Months
A survey involving US teenagers during the summer of 2022 revealed that symptoms, which were reported at four weeks post-infection, generally improved by three months, according to the second study.
The survey included responses from 784 participants aged 12 to 17. Among them, 264 (34%) reported a positive COVID-19 test, 291 (37%) had never tested positive, and 229 (29%) had not been tested at all for SARS-CoV-2.
For those who tested positive, 41% reported at least one symptom lasting four weeks or more, compared to 12% of negative respondents and 11% of those never tested. No correlation was found between COVID variant type and the likelihood of enduring symptoms.
“Most symptoms resolved within three months, with less than 30% of adolescents experiencing prolonged symptoms for three months or longer after testing positive,” the researchers concluded.
