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If majority of your symptoms have abated then this is unlikely anything serious in nature. Sometimes one or more symptoms lag behind other symptoms while resolving so it is quite possible the chills are just lagging behind the other symptoms and in the next few days they are too expected to resolve. However you may ask your doctor to find out whether a course of antibiotic would be necessary – just to hasten the recovery process. If this is a viral infection then antibiotic is not necessary however if there is also some concomitant bacterial infection then an antibiotic course can hasten the recovery process so this is something to be considered.
One or other way this does not appear to be any serious issue and we are certainly not dealing with any complications from the recent infection.
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