The field of Microbiology is a booming sector which offers a lot of career openings for experts in the field. They have enormous openings in the Public sector firms and also in Private sector organizations. There are some jobs in government sector which includes -

1. Development laboratories

2. Hospitals

3. Pharmaceutical Sector

4. Food Industry

5. Beverage Units

6. Chemical Industries

After completing B.Sc microbiology, you can only pursue for central govt jobs via competitive examination which will not be related to the course you studied.

I suggest you not to depend totally on government jobs but you can try it. You can try in private sectors.