Thanks for posting your query.
Your child is having upper respiratory tract
infection which is mostly of viral origin so antibiotics do not give bright results as per expectation.
Your child should include lukewarm Saline gargles thrice a day and besides should continue the same drugs for further three days.
You have not mentioned whether Widal
A 1:40 dilution of Widal is insignificant even when positive.
You should continue as I have advised.
I hope the child would recover soon.
I will be available for your follow up queries.