APHA Vaccine Schedules & Recommendations 3

Question 1

What is the minimum interval between the first and second doses of the hepatitis A vaccine series?

Accepted Answer

6 months

Answer

The two-dose hepatitis A series requires a minimum interval of 6 months between doses for full seroconversion.

Question 2

Under the US immunization schedule, the rotavirus vaccine series must be completed by what maximum age?

Accepted Answer

8 months 0 days

Answer

Due to intussusception risk, no rotavirus vaccine doses should be initiated or given after 8 months 0 days of age.

Question 3

A 65-year-old adult who has never received pneumococcal vaccine should receive which vaccination sequence according to ACIP?

Accepted Answer

PCV15 followed by PPSV23 at least 1 year later, or PCV20 alone

Answer

ACIP recommends either PCV15 followed by PPSV23 (≥1 year later) or PCV20 alone for immunocompetent adults aged 65+.

Question 4

Which vaccine is contraindicated in pregnancy due to being a live attenuated virus vaccine?

Accepted Answer

Varicella

Answer

Varicella vaccine is a live attenuated vaccine and is contraindicated during pregnancy; it should be given postpartum if needed.

Question 5

The Hib (Haemophilus influenzae type b) vaccine series typically concludes with a booster dose at which age?

Accepted Answer

12–15 months

Answer

Depending on the brand used, the Hib booster dose is given at 12–15 months to complete the primary series.

(APHA) American Public Health Association Immunization Certification Practice Test