Final answer:
Three mechanisms of disease transmission are direct contact, indirect contact, and airborne transmission. Three variations of contact transmission are physical touch, shared objects, and sexual contact.
Step-by-step explanation:
Three Mechanisms of Disease Transmission:
- Direct Contact: Pathogens can be transmitted through direct contact between an infected person and a new host. This can happen through skin-to-skin contact or touching the same surfaces.
- Indirect Contact: Pathogens can spread through indirect contact with contaminated objects or surfaces known as fomites. For example, if someone touches a contaminated doorknob and then touches their face, they can transfer the pathogen.
- Airborne Transmission: Some pathogens can be transmitted through the air. When an infected person coughs, sneezes, or talks, respiratory droplets containing the pathogens can be inhaled by others.
Three Variations of Contact Transmission:
- Physical Touch: This involves direct skin-to-skin contact between an infected person and a new host, such as shaking hands or hugging.
- Shared Objects: Pathogens can be transmitted through indirect contact with contaminated objects that multiple people touch, such as doorknobs, utensils, or toys.
- Sexual Contact: Certain pathogens can be transmitted through sexual activity when there is direct contact between mucous membranes or their secretions.