My father (age 65 years) has fever for last 10-12 days. Corona test is negative. Fever goes up (100-101) in the morning but after taking medicine it goes down to 98. Oxygen level is 96. He is not having any infection, only fever and he is feeling very weak. He does have underlying heart condition. Doctor said this is viral and fever will be there for 15-20 days and then weakness for another one month. We don't want to take risks by taking him to different doctors especially because of corona. We need advise on what tests can be done so we can further identify the reason of fever. Also if we can get help from online/video consultation, that will be helpful. Please suggest.