Hi

No, it's not possible to get admissions to MSc-PhD medical microbiology integrated course in IIT Kharagpur based on GATE qualification and ranking. As CAT has nothing to do with biology.

For that give JAM

Joint Admission Test for M.Sc. (JAM) is an all-India examination conducted across the country jointly by the Indian Institutes of Technology and the Indian Institute of Science. JAM is an all-India Entrance examination for admission to M.Sc. (Two Year), Joint M.Sc.-Ph.D., M.Sc.-Ph.D. Dual Degree and other Post-Bachelor's Degree programs at the IITs and to the Integrated Ph.D. programs at IISc.

Thanks