Final answer:
The three categories of transmission-based health precautions are contact precautions, droplet precautions, and airborne precautions.
Step-by-step explanation:
The three categories of transmission-based health precautions are contact precautions, droplet precautions, and airborne precautions.
Contact precautions are required when there is a risk of direct contact with bodily fluids or surfaces contaminated with infectious agents. Droplet precautions are needed when an infection can be spread through respiratory droplets, such as coughing or sneezing. Airborne precautions are necessary when tiny particles containing infectious agents can remain suspended in the air for long periods and be inhaled by others.