It may be because data were originally coming mainly from patients presenting to hospital who were therefore likely to be sicker. There are a few reasons we could be seeing the symptoms evolving in this way. Meanwhile, loss of smell, which was originally quite common, now ranks ninth. While fever and cough have always been common COVID symptoms, and headache and sore throat have traditionally presented for some people, a runny nose was rarely reported in earlier data. But given Delta is predominating in the UK at present, it’s a safe bet the symptoms we see here reflect the Delta variant. The reports don’t take into account which COVID variant participants are infected with. Using a self-reporting system through a mobile app, data from the United Kingdom suggest the most common COVID symptoms may have changed from those we traditionally associated with the virus. So what are the common signs and symptoms of the Delta variant? For example, older people may have different symptoms to younger people, and collecting data from patients in a hospital may be different to patients at a GP clinic. It’s important to note this data is not always easy to collect or analyse to ensure there’s no bias. To ascertain this, we have to collect information from individual cases. So when we talk about the signs and symptoms of a virus, we’re referring to what is most common. Age, gender, medications, diet, exercise, health and stress can all affect host factors. Host factors are specific to the individual. Viral factors change as the virus evolves. Viral factors include things like speed of replication, modes of transmission, and so on. The way a virus causes illness is dependent on two key factors: A symptom is something that’s felt, like a sore throat. This means the same virus can produce different signs and symptoms in different ways.Ī sign is something that’s seen, such as a rash. With our differences come different immune systems.
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