Mycobacterium tuberculosis, a human pathogen with an inhalation route of exposure, a low infectious dose and is capable of causing severe disease, including death, is representative of which Risk Group?

The correct answer is - Risk group 3

Explanation:

The microbes are classified into 4 risk groups according to the threat they pose to human beings. In risk group 1st those organisms are present which normally do not pose a threat to a healthy person.

In risk group 2 those organisms are present which pose a moderate threat to humans but rarely become serious and their therapeutic intervention is easily available.

Organisms that poses a serious threat to humans and whose therapeutic interventions may be available comes under risk group 3. For example, Mycobacterium tuberculosis comes in this group because it can cause serious and lethal disease in humans and is resistant to many antibiotics. So the correct answer is risk group 3.