Hi, my father us suffering from pleural effusion In Feb

Patient: Hi, my father us suffering from pleural effusion. In Feb 2014, he got viral fever and he was not able to recover properly from it till October. Doctors were also taking it easy and were giving him meds. In October after CT scan, doctors realized that he had fluid filled in lungs. They inserted a tube inside his chest and removed the water for more than a week. They discharged him after 2 weeks. They checked after one week and found that fluid was still there. They admitted him again and removed the water using injections. Then they discharged him in mid if December, 2014. After that they are taking regular blood tests and uhmy father is vaccated. But he is not recovered yet. Can you please give an advice?in

Doctor: