The USDA<span> Center for Nutrition Policy and Promotion.</span>
B. because entry points are vital to the spread of infection
They include injectables (such as Depo-Provera), oral contraceptive pills, patch, ring and the diaphragm. The least effective<span> methods result in 18 or more pregnancies per 100 women in a year, with typical use. They include male and female condoms, withdrawal, sponge, fertility-awareness-based methods, and spermicide.</span>
Skin immunity is a property of skin that allows it to resist infections from pathogens. In addition to providing a passive physical barrier against infection, the skin also contains elements of the innate and adaptive immune systems which allows it to actively fight infections. I hope that this helps.
