Final answer:
Phlebotomists must follow standard, airborne, droplet, and contact precautions when collecting a blood specimen from a patient infected with diphtheria.
Step-by-step explanation:
When collecting a blood specimen from a patient infected with diphtheria, the phlebotomist must follow standard, airborne, droplet, and contact precautions. Diphtheria is a contagious respiratory disease that spreads through respiratory droplets, so airborne and droplet precautions are necessary to prevent transmission. Additionally, contact precautions are important to prevent the spread of the infection through direct contact with the patient or contaminated surfaces.