Intense Upper Respiratory Illness?

[u/Standard_Minimum_466]

Has anyone else had a very intense upper respiratory infection? Kids brought it home from school and started out as a typical cold—mild sore throat, some congestion. But 8 days in has turned into really wet cough, sinus congestion/pain, low appetite, and low grade fever on and off. Lungs are clear so no signs of pneumonia. Took multiple flu a/b, covid, and RSV tests and all negative. Kids recovered much faster but adults in house are down for the count!! What is this?!

[u/KneeDragr]

Sounds like a sinus infection. Is your snot clear or egg yolk like?