19. Innate Immunity

Which is the most abundant class of antibodies found in human serum?

The complement cascade and its by-products contribute to which of the following immune responses?

In the context of infectious diseases, what is meant by a disease's immunity threshold?

Which of the following is a common strategy used by bacterial pathogens to evade the host immune response?

Which of the following is NOT a factor that weakens host defenses against infections?

Which of the following best describes the action of an antigen-presenting cell (APC) after it engulfs a microbe?

Which of the following is NOT an antiphagocytic factor?

Which of the following best distinguishes vaccines from antitoxins in the context of immunity?

Which cells of the second line of defense recognize and kill virus-infected cells?

It is inappropriate to prescribe antibacterial agents to treat colds or flu because:

Which of the following is the most prevalent cause of immunodeficiency worldwide?

Which host cell type is primarily responsible for phagocytosis during the innate immune response?

Which medication prevents viral infections by priming the immune system against a specific virus?

Which of the following is NOT an effect of complement activation?

In the structure of an antibody, which regions are responsible for binding to antigens?