Haemophilus influenzae is a common causative agent of the neonatal conjunctivitis known as “sticky eye.”

Stem cells have the potential to develop into different specialized cell types with specific functions.

Interleukins are numbered according to when they were discovered and function as mediators between the white blood cells.

Trichomoniasis is an infection of the reproductive system that can affect both the male and female reproductive systems.

All hypersensitivities involve antibody-antigen reactions.

The most likely primary site of replication during mononucleosis is the T lymphocyte.

Escherichia coli is the leading cause of bacterial diarrhea in the United States.

The complement proteins are synthesized by hepatocytes but are also produced by monocytes, macrophages, and epithelial cells of the gastrointestinal and genitourinary tracts. These proteins circulate in the blood and extracellular fluid, primarily in an inactivated state. 

An epitope is the smallest part of an antibody to which an antigen molecule binds itself to. 

Apoptosis is one of the changes in the morphology of a host cell caused by viral infections referred to as cytopathic effects.