What viral illness causes 103 temp already been checked for the flu and strep throat. has bad dry cough and stomach ache. what is this?

Only an examination and evaluation by a health care professional can determine that. A temperature of 103 in an infant or young child should be evaluated by a physician, a persisting temperature of 103 in older children and adults should also be evaluated to determine if the cause is bacterial, which would need to be treated right away. Contact your health provider for advice.