hello aspirant

ofcoarse you can read microbiology if u fail in physics .the subject is all about study of microbes and microorganisams,.

Why can't you read Microbiology if you failed at Physics. There is no harm in it. Read to learn and earn.
Microbiology is a study of microbes.
Microbiologists have an option to work in clinics and hospitals. There are several types of specialisations in it. You can go for any one of them.