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Table 1 Reports some definitions of long COVID by the most important healthcare organizations

From: Long COVID headache

International society, year Definition of long COVID
Centers for Disease Control and Prevention (CDC, 2021) “Wide range of new, returning, or ongoing health problems people can experience four or more weeks after first being infected with the virus that causes COVID-19”
World Health Organization (WHO, 2021) “Illness that occurs in people who have a history of probable or confirmed SARS-CoV-2 infection, usually within three months from the onset of COVID-19, with symptoms and effect that last for at least two months, that cannot be explained by an alternative diagnosis”
National Health Service (NHS, 2021) “Symptoms lasting weeks or months after the infection has gone”
National Institute for Health and Care Excellence (NICE, 2021) “Two definitions of postacute COVID-19 are given: (1) ongoing symptomatic COVID-19 for people who still have symptoms between 4 and 12 weeks after the start of acute symptoms; and (2) post-COVID-19 syndrome for people who still have symptoms for more than 12 weeks after the start of acute symptoms.”