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Rates were slightly higher at 42 days for those receiving the Pfizer versus Moderna vaccine.
Those who are partially vaccinated and unvaccinated face the same increased risk, whereas boosted and fully vaccinated adults fare best.
Risks for new-onset psychiatric diagnoses and anxiety disorders, but not mood disorders, increased in the early postacute phase.
However, for all ages, vaccine effectiveness against severe COVID-19 was high overall, at 90% five months or longer after two doses.
The authors say that the review findings are limited by heterogenous definitions of long COVID in published studies.
Compared with placebo, normalization of C-reactive protein and oxygen saturation was faster, with improvements seen on day 3 of treatment.
SARS-CoV-2 vaccination appears to have no positive or negative impact on cognitive function or fatigue.
Individuals with breakthrough infection have an increased risk for death and postacute sequelae compared with contemporary controls.
Persisting evidence of cardio-renal involvement and hemostasis pathway activation was reported at 28 to 60 days after discharge.
Most SARS-CoV-2 infections are not asymptomatic; those with asymptomatic infections are less infectious.