Long COVID: Low levels of circulating serotonin found in Long COVID patients

Responsible for almost 7 million deaths worldwide¹, COVID-19 is the deadliest communicable healthcare outbreak of the 21st century.² Among the hundreds of millions of confirmed cases¹, it is estimated that approximately 10-20% go on to develop long COVID.³ Post COVID-19 condition, or long COVID, is a complex, multi-system illness characterised by either new or ongoing symptoms which last beyond 12 weeks of initially contracting COVID-19.³