Sore throat, cough, body ache with negative dengue/malaria/typhoid and
CRP 26.8 points to a viral upper respiratory infection, most likely influenza this season. Fever of 100 F on day 3 of azithromycin is not treatment failure - viral fevers routinely run 4-5 days and antibiotics do nothing for them. Do not add another antibiotic. Testing for H1N1 is worth it only if the fever is high grade with severe body ache or you are breathless; otherwise focus on paracetamol as needed, steam, warm fluids and rest. Come to casualty or call me urgently if you get breathlessness, chest pain, fever crossing day 5-6, or drowsiness. Take a Practo consult with me with your CBC and I will tell you whether to escalate or simply ride it out.