When T cell recognizes a cell with an odd MHC I, it will release perforins that:

After the first exposure to a novel antigen, we may develop symptoms (e.g., fever, congestion, malaise) to fight off the infection while we create antibodies for it. Do symptoms typically appear with a second exposure?

Which of the following statements is correct about the polio and the polio vaccine? Mark all that apply.

In 1985, a vaccine for Hemophilus influenzae type B (HIB) was created. In the decades since, the incidence of HIB meningitis among the infants, toddlers, and small children has almost disappeared in rich countries.

The discoverer of the pathogenic bacterium Hemophilus influenzae wrongly assumed that the microbe was the cause of the flu. 

Which of the following statements are correct about smallpox? Mark all that apply.  

What disease caused the scars in the photo below?

In a typical Y-shaped antibody, how many antigens can the antibody bind to?  

The surface of what immune cell is coated in membrane bound antibodies?  

A gamma globulin shot contains _________ that will bind to a toxin (e.g. tetanus toxin) prevent it binding to host cells.