The biosafety level (BSL) for a clinical microbiology laboratory working with potentially airborne pathogens, such as tuberculosis bacteria, is

a. BSL-1

b. BSL-2

c. BSL-3

d. BSL-4

Answer: BSL-3

Explanation:

This level includes the bacteria that is either indigenous or exotic, and it has the ability to cause severe diseases even through inhalation.

These microbes are so serious that working on them is restricted only upto some government agencies.

These personnel receive immunization against these bacteria as they work on them.

Examples: yellow fever, bacteria that cause tuberculosis, nile virus.