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Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic ________, or alternatively antigenic __________ , which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain. 

A diagnosis of tuberculosis can involve 

What are prion diseases? Why is medicine worried about diseases caused by prions? Are prion diseases curable or treatable?

If a person who has never been infected with the varicella-zoster virus comes in contact with a person who has shingles, they may soon come down with 

Agricultural workers and field archaeologists can be exposed to this fungal “valley fever” organism which, although entering via the respiratory tract, can cause meningitis: 

Which of the following provides the eyes with their best defense against microorganisms? 

Erythema migrans, a bull’s-eye rash (see image above) at the portal of entry, is often associated with 

Which is INCORRECT about warts? 

The four classes of grafts are autograft, isograft, allograft and xenograft. Briefly describe/define each.

What is the function of normal microbiota of the respiratory tract?