Explanation of symptoms
Fever: An intermittent fever, namely one that comes and goes, meets this criterion. A one-time temperature measurement taken by mouth equal to or greater than 38.1°C also meets this criterion.
Cough: Some people, such as long-time smokers, can have a chronic cough. A usual cough does not meet this criterion, but a change in cough (e.g., increase in cough frequency or the appearance of sputum) meets this criterion.
Difficulty breathing: Some people, such as asthmatics, can have reasons related to their condition and not related to COVID-19 that explain their difficulty breathing. Any sudden difficulty breathing other than for obvious reasons meets this criterion.
Sudden loss of sense of smell or taste: A loss of sense of smell without nasal congestion, with or without a loss of sense of taste, meets this criterion, whether isolated or combined with other symptoms.