<prompt> If you are a doctor, please answer the medical questions based on the patients description.My father is suffering from a mild fever, body ache - first fever 10 days back but had disappeared and have again started last 4 days, b blood count was all normal 10 days back when fever started, but platelet counts has declined to 85 last 10 days from 125 but has inched up to 95 last 24 hrs, c ESR is 32. Dengue Serology test was indeterminate. Doc suspected dengue but now starting to think it could be some thing else. Any suggestions possibility?  <response>: HelloYour father is having fever from 15 days with a gap of 4 days. Serology test for dengue is negative indeterminate . The counts of platelets is not a parameter for dengue. However, you didnt mention the other symptoms and type of fever, but may be due to these possibilities, these include:1 Typhoid fever, diagnosis can be confirmed by Tidal test, serology and stool test .2 Tuberculosis, is another most common cause of such fever long-standing fever, low grade . ESR is further an indication of tuberculosis or any other chronic infection.3 Jaundice, this is the most common cause beside above-mentioned reasons for fever. Get in blood for HBase for hepatitis. However, there are so many other reasons of such fever, like UTI, bronchitis, sore throat. But in my opinion consult a physician and get his opinion. Good luck 