A viral fever is quite possible diagnosis. Your son needs a thorough clinical examination and investigations. I think, your pediatrician
has done it and reached the diagnosis.
Viral fever has symptoms like- runny nose, congestion, coughing, fever, body ache, appetite loss etc.
Here are the common causes of fever in children
Infections in Respiratory tract
, Urinary tract, Otitis media (ear infection), Gastrointestinal infection
, Influenza, Malaria, Typhoid, Dengue, Mumps, measles, Chicken pox etc.
Common viral fever (Influenza or FLU) are usually self limiting viral infection and symptomatic management is needed. Fever subsides by 4-7 days.
Only striking thing is that the fever is continuing for long duration !
The following tests may be necessary for diagnosis (according to clinical features )
Tests like - Blood count (CBC), C-reactive Protein
(CRP), Blood C/S, WIDAL (for typhoid) Malaria parasite(MP) slide microscopy & antigen, Dengue Antigen and antibody, Urine RE, ME & CS, Stool examinations.
Please visit your doctor and get the investigations (as he/she suggest) done.