IF YOUR FLU SYMPTOMS GET BETTER AND THEN GET WORSE, CALL YOUR DOCTOR IMMEDIATELY !!! Of the information that I had not known about flu, I think this is much the most important:
“Other signs of complications include symptoms that improve and then get worse, more shortness of breath, or a fever that goes away and then comes back. These can be signs of secondary infections, and you should call a doctor right away.”
Not to be melodramatic, but whenever I read about some exotic or rare disease which can be lethal, it seems as though the symptoms are always initially described as “flu-like.”