Final answer:
Airborne precautions should be implemented for varicella (chickenpox), smallpox, and tuberculosis (TB) because they are spread through aerosols, particles, or respiratory droplets from infected individuals.
Step-by-step explanation:
The isolation precautions for different infectious diseases vary based on the transmission methods of the pathogens. For varicella (chickenpox) and smallpox, which are highly contagious through contact with aerosols, particles, or droplets from infected individual's blisters or respiratory secretions, airborne precautions should be implemented. These precautions are designed to prevent transmission via air currents and require specialized air handling and ventilation. Meanwhile, for tuberculosis (TB), which is spread through the inhalation of respiratory droplets from an infected person, airborne precautions are also necessary. In these cases, healthcare providers and others in close proximity to the affected patient should use personal protective equipment, such as N95 respirators or higher-level respirators, to reduce the risk of airborne transmission.