2 yr old son, 103.9f fever 1 day, runny nose, occasional cough, red throat. Flu test negative. Dr said viral but gave antibiotic. What's his sickness?

Not sure......... With a history of one day of fever runny nose and cough, this sounds very viral. I am not sure why your son was given an antibiotic--a throat swab was not done to consider strep throat, the only throat infection for which an antibiotic would be given,
Unclear. Need to ask doctor why he/she prescribed antibiotic if viral infection was suspected. Child has upper respiratory infection but unclear what organism doctor wanted antibiotics to cover.

Related Questions

My 9 year old has had an unbreakable fever above 39 for 3 days, just getting worse instead of better. Red throat with pustules, runny nose and cough?

Recommend evaluation. Runny nose and cough are suggestive of influenza or other viral illness, but with the red throat, it is important to evaluate for strep throat or other infection that may require intervention. Best wishes. Read more...
Time for visit. The mouth/throat is the main entry point in people for germs that cause illness. The throat findings you cite are not specific to a particular illness, but could be a simple strep throat , flu, mono or something else. There could also be any number of other things causing the fever. By 3 days in to a sustained fever it is likely to be something that requires prescribed medication.Time for a visit. Read more...

6 yr old had runny nose for a week now has fever, runny nose, earache, and red throat. Doctor said probably virus then next da said to take augmentin (amoxicillin and clavulanate).

That's correct. The viral infection in the upper respiratory airways, which is running for a week, seems like had a complication such as an acute otitis (ear infection), that's why your doctor prescribed the course of antibiotics. Read more...
Passage of time. Your doctor probably felt that what started off as viral became bacterial because of the passage of time and the finding of a possible ear infection. Read more...
See below. As you may be aware, ear or throat infection resolves by itself, not too infrequently. Acute otitis media in children over 2 years old may be handled in different way, so called watch & see approach instead of treating with antibiotics when seen. Read more...