Understanding viruses.

Which of the following statements about viruses is not true: They are parasitic They are autotrophs They contain either DNA or RNA They use living cells of other organisms for reproduction The enzyme is enclosed in a peote shell

Immunity & Infectious Diseases

Why are the symptoms of a cold similar every time? What is the role of the mass cells? How is it that a person becomes immune to a particular infection once she or he has recovered?

Infection & Immunity

The interactions and origins of the different types of T cells and B cells and the role of "recognition." Description of their connection in a specific immune response.

What is a prion?

This answer introduces prions, their multiple forms and their role in infectious and non-infectious diseases of humans, cows, sheep and deer.

West Nile Virus

Why does IgM increase by four fold with west nile virus between acute and four weeks later? Please explain the pathophysiology ie. complement system.