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Honing in on a subset of data from around 1,600 users infected with COVID-19 in the United Kingdom and United States, the team identified the six groups of symptoms outlined below:

1. Flu-like with no fever: Headache, loss of smell, muscle pains, cough, sore throat, chest pain, no fever.

2. Flu-like with fever: Headache, loss of smell, cough, sore throat, hoarseness, fever, loss of appetite.

3. Gastrointestinal: Headache, loss of smell, loss of appetite, diarrhea, sore throat, chest pain, no cough.

4. Severe level 1, fatigue: Headache, loss of smell, cough, fever, hoarseness, chest pain, fatigue.

5. Severe level 2, confusion: Headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain.

6. Severe level 3, abdominal and respiratory: Headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain, shortness of breath, diarrhea, abdominal pain.

Researchers then conducted further analysis to determine whether people in particular symptom clusters experienced more severe illness and were more likely to require breathing support.
They found 1.5% of patients in the first cluster, 4.4% in the second and 3.3% in the third required breathing support. These figures were 8.6%, 9.9% and 19.8% for the third, fourth and sixth clusters respectively. What's more, nearly half of the patients in cluster 6 ended up in hospital, compared with just 16% of those in the first.

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They found 1.5% of patients in the first cluster, 4.4% in the second and 3.3% in the third required breathing support

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1. Flu-like with no fever: Headache, loss of smell, muscle pains, cough, sore throat, chest pain, no fever

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