Which of the following groups of infants should receive passive immunization for RSV? 1. Chronic lung disease 2. Infants born less than 32 weeks' gestational age 3. Infants with congenital heart disease 4. Infants with retinopathy of prematurity

a. 1 only
b. 1, 2, and 3 only
c. 1 and 3 only
d. 1, 3, and 4 only

ANS: B
Passive immunization is now recommended for infants younger than 2 years of age who are re-quiring medical therapy for chronic lung disease, infants born less than 32 weeks' gestational age, and infants with congenital heart disease who have cardiovascular compromise.