APHA Vaccine-Preventable Diseases & Immunology 2

Question 1

Which type of immunity is conferred when a vaccinated individual protects unvaccinated members of a community by reducing pathogen circulation?

Accepted Answer

Herd immunity

Answer

Herd immunity (community immunity) occurs when a sufficient proportion of a population is immune, reducing transmission and protecting those who cannot be vaccinated.

Question 2

A child receives antibodies through breast milk that protect against rotavirus. This is an example of which type of immunity?

Accepted Answer

Passive natural immunity

Answer

Passive natural immunity occurs when antibodies are transferred naturally from mother to child via breast milk or placenta, without the recipient mounting their own immune response.

Question 3

Pertussis (whooping cough) is caused by which organism?

Accepted Answer

Bordetella pertussis

Answer

Bordetella pertussis is the gram-negative bacterium responsible for pertussis, characterized by severe paroxysmal coughing fits followed by an inspiratory whoop.

Question 4

Which vaccine component is responsible for stimulating an immune response without causing disease?

Accepted Answer

Antigen

Answer

The antigen is the component of a vaccine that the immune system recognizes and responds to, generating memory cells and antibodies without causing infection.

Question 5

Mumps primarily targets which organ system, potentially causing a serious complication in post-pubertal males?

Accepted Answer

Salivary glands and potentially testes causing orchitis

Answer

Mumps classically causes parotitis (salivary gland swelling) and can cause orchitis in post-pubertal males, which may rarely lead to infertility.

(APHA) American Public Health Association Immunization Certification Practice Test

(APHA) American Public Health Association Immunization Certification Practice Test

APHA Vaccine-Preventable Diseases & Immunology 2