Which of these modes of transmission require a bodily opening either natural or artificial?

Vectors-These are diseases transmission which involves the piercing of the skin-vectors penetration e. g by mosquito. ticks.

Air borne which involves entry through the nasal passages, mouth, eyes to reach the body the respiratory tracts and the blood.

Blood borne diseases are transmitted from e. g piercing of the skin by contaminated objects needles, broken glass. If there is an opening in the skin these transmission is also possible.

Sexual can be transmitted through open sores at the genitals. or use of contaminated needle by infected subject. Sores in the mouth during kissing may be another route

food borne or water borne needs to enter through natural opening of the mouth to reach the body fluids and the blood through the GIT.

Contact diseases does not necessarily need a direct opening for transmission. rather there should be a direct contact between the infected individual and the other. Sometimes a direct contact between the two is not need. e. g common cold, chicken pox, influenza, etc.