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What brain defense restricts substances from entering the brain by the vascular system? 

Necrotizing fasciitis is 

Defenses of the GI tract against pathogens include 


Is it correct (True/False) to describe a whole bacterial colony that is present on a petri dish as having a “cocci” morphology?

True or False: Sinusitis, otitis media, and pharyngitis can all be sequelae of the common cold.

A significant causative agent of Lyme disease is 

Yersinia pestis is associated with: 

A blood specimen from a patient has been taken by the doctor, with which she made a blood smear on a microscope slide.  The doctor takes the blood smear down the hall to a lab where after staining it she uses a regular light microscope to survey the blood, Which of these diseases would likely be identified in this way? 

There are some major differences between prion infectious agents and viruses. Which statement describes a major difference? 

What is the name of the medium in the green tube (negative result) and blue tube (positive result) and what is it used for?