The WHO’s definition of a confirmed case of covid-19 is a person shown by laboratory testing to be infected with the virus, irrespective of clinical signs and symptoms. However, some reported case numbers from China have included people with symptoms of (covid-19) but without laboratory confirmation.
The most commonly reported symptoms include a fever, dry cough and tiredness, and in mild cases people may get just a runny nose or a sore throat. In the most severe cases, people with the virus can develop difficulty breathing, and may ultimately experience organ failure. Some cases are fatal.
The virus can also be asymptomatic, causing no noticeable illness in some people – but these people are still contagious and can spread the virus.
On 11 March, the WHO announced that the outbreak should be considered a pandemic – a term that has no universally agreed definition, but means that multiple countries are seeing sustained transmission between people of an outbreak causing disease or death.
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