Disease transmission can be prevented by breaking one or

more of the links in this chain of transmission

Most pathogens have a preferred portal of entry, one that

gives ready access to an immediate environment suitable

for the establishment of growth, or one that allows the

pathogens to reach their target tissues or organs.

Common portals of entry include the respiratory tract, gi

tract, mucosa (e.g., conjunctiva, nose, mouth),

genitourinary tract, breach of skin integrity, or mosquito bite