P/O viral infection
due to decreased immunity.
Thanks for writing to XXXXXXX
There might be some source of infection that is causing recurrent fever
You need proper clinical examination and investigation so that source of infection can be identified.
You need routine hemogram,RBS,LFT,RFT,Lipid profile
of abdomen,Chest X-ray(PA view),Urine RE/ME.Further investigations can be done if needed.
There are many causes of fever with chill and rigor.It may be due to recurrent urinary tract infection
also,but you don't have history of burning sensation in urine and it doesn't resolve in hours.Other common causes like typhoid,chronic malaria need to be ruled out.
You may have decreased immunity that is causing recurrent viral infection.
Proper treatment can be done after clinical examination and investigation reports.
Get well soon.
Hope i have answered your query.
Further queries are most welcome.