Biology 215 Introductory Microbiology Chapter 15 Microbial Mechanisms of Pathogenicity I. Entry of a microorganismsm into a host A. Portals of entry 1. Mucous membranes which line the respiratory, GI, GU tracts and conjunctiva. Fecal oral route c. Genitourinary tract - STDs 2.
Hookworm can bore through intact skin.
Dermatophytes infect unbroken skin. For example, Salmonella must be swallowed, Streptococci must be inhaled. This varies from microbe to microbe. More commonly use LD 50 and ID 50 . Ligands may be on fimbriae, on the glycocalyx, or on the cell wall.