Which client should be placed on droplet precautions?

Droplet precautions are essential for preventing the spread of infections that are transmitted through respiratory droplets when an infected person coughs, sneezes, or talks. The condition that warrants droplet precautions among the options provided is rubella, which is also known as German measles. This viral infection can be spread through respiratory droplets, making droplet precautions necessary for clients with this condition to protect others in the healthcare setting.

In contrast, measles is spread through airborne transmission rather than droplet transmission, necessitating airborne precautions. Hepatitis A, primarily a viral infection affecting the liver, is transmitted through the fecal-oral route, and therefore does not require droplet precautions but rather good hand hygiene and sanitation practices. Rocky Mountain spotted fever, a tick-borne disease, is not transmitted from person to person and does not require droplet precautions either. Thus, the most appropriate choice for droplet precautions is the client with rubella.