WHO has developed a clinical case definition of post COVID-19
condition by Delphi methodology
that includes 12 domains, available for use in all settings. This first version
was developed by patients, researchers and others, representing all WHO regions,
with the understanding that the definition may change as new evidence emerges
and our understanding of the consequences of COVID-19 continues to evolve.
Post COVID-19 condition occurs in individuals with a history of
probable or confirmed SARS CoV-2 infection, usually 3 months from the onset of
COVID-19 with symptoms and that last for at least 2 months and cannot be
explained by an alternative diagnosis. Common symptoms include fatigue,
shortness of breath, cognitive dysfunction but also others and generally have
an impact on everyday functioning. Symptoms may be new onset following initial
recovery from an acute COVID-19 episode or persist from the initial illness.
Symptoms may also fluctuate or relapse over time.