Dear applicant The three combinations that you have in B.Sc in way too strong to build a healthy career for you, but yes there is no restriction to knowledge. As your subject combinations are Chemistry, Microbiology and Zoology, you can try some certified courses offered by Coursera on Health Care Management, Human Physiology, Common Health care measures etc.which you can add up to your CV to get the best selection during job interviews.

Good luck !!!