The relationship between eyelash mites and humans is an example of 

A term that means bacteria are circulating in the blood is 

Which of the following invades host tissues and avoids body defenses?

Carriers can be thought of as individuals that harbor and spread the pathogen in absence of signs and symptoms.

Lymph fluid

The type of cell that stops the immune system from overreacting and responding to harmless substances is the 

Once a B cell is activated and proliferates into a clone, some differentiate into 

Inflammation is a body defense that can cause tissue damage.

Central tolerance indicates that as lymphocytes mature, the ones that do not recognize self molecules 

An microorganism that causes disease only if there is a weaking of the body defenses, such as immunocompromised patients, is called a