In addition to the integrity of the integumentary system, what other component of the skin protects against bacterial infection?

Oil Glands/Sebaceous glands

Explanation:

Sebaceous glands are microscopic small exocrine oil producing glands in the skin of mammals. These glands are connected to hairs follicles and secrete an oily substance called sebum  on the surface of skin. These glands are present throughout the skin except the palm of hands and sole of feet.

Sebaceous glands are part of skin and help in immune system by providing protection against microorganism such as bacteria. The glands form the acid film on the skin that help in protection against bacteria. The pH of skin is between 4.5-6.2 that protects against alkaline contaminants.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.