Vaccine Schedules & Recommendations Flashcards

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

Answer: 6 months

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

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

Answer: 8 months 0 days

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

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

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

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

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

Answer: Varicella

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

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

Answer: 12–15 months

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

An unvaccinated 14-year-old initiating HPV vaccination today should receive how many doses?

Answer: 3 doses

Individuals who initiate HPV vaccine at age 15 or older require 3 doses (0, 1–2, and 6 months); at 14 they are still in the 2-dose window if starting before age 15.

Which influenza vaccine formulation is specifically approved only for adults aged 65 and older?

Answer: High-dose inactivated IIV4 or adjuvanted IIV4 (aIIV4)

High-dose (HD-IIV4) and adjuvanted (aIIV4) influenza vaccines are preferentially recommended for adults ≥65 years due to enhanced immunogenicity.