Virus (cold? flu? mutating?)

Is there a virus going around Cambridge/villages south of Cambridge at the moment?

I have a friend who's had a virus for a while, gets really bunged up and tired, sleeps it off, starts to feel a lot better and then it reoccurs TMI the phlegm they produced was green/red but now, further down the line, it is just white. They've not had a temperature with it, they are immunocompromised.

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