Most viral infections of the skin enter the body through hair follicles and ducts of the sweat glands.

A complement-fixation test is an immunological medical test that can be used to identify pathogens like U. urealyticum, one of the smallest bacteria known to be a human pathogen. 

DNA immunization uses a genetically modified plasmid to stimulate immunologic memory.  These vaccines are known as subunit vaccines.

Warts are the result of common viral infections caused by the herpes simplex virus. 

Cytokines are small proteins considered to be chemical messengers that allow for communication between cells of the immune system.

What is one of the major differences between a virus and a bacteria?

A loss of energy, lack of interest and pleasure in usual activities, negative self-concept, and recurrent thoughts of death and suicide are common symptoms of:  

Which group of words is most appropriate for the psychodynamic theory of Freud?

The fear that a person experiences in a phobia is:    

Which factor appears to be important in psychotherapy, regardless of the methods used?