7. Inactivated poliovirus vaccine (IPV). (Minimum age: 6 weeks) Routine vaccination:  Administer a series of IPV at ages 2, 4, 6–18 months, with a booster at age 4–6 years. The final dose in the series should be administered on or after the fourth birthday and at least 6 months after the previous dose. Catch-up vaccination:  In the first 6 months of life, minimum age and minimum intervals are only recommended if the person is at risk for imminent exposure to circulating  poliovirus (i.e., travel to a polio-endemic region or during an outbreak).  If 4 or more doses are administered before age 4 years, an additional dose should be administered at age 4 through 6 years.  A fourth dose is not necessary if the third dose was administered at age 4 years or older and at least 6 months after the previous dose.  If both OPV and IPV were administered as part of a series, a total of 4 doses should be administered, regardless of the child’s current age.  IPV is not routinely recommended for U.S. residents aged 18 years or older.  For other catch-up issues, see Figure 2.
8. Influenza vaccines. (Minimum age: 6 months for inactivated influenza vaccine [IIV]; 2 years for live, attenuated influenza vaccine [LAIV])
Routine vaccination:  Administer influenza vaccine annually to all children beginning at age 6 months. For most healthy, nonpregnant persons aged 2 through 49 years, either LAIV or IIV may be used. However, LAIV should NOT be administered to some persons, including 1) those with asthma, 2) children 2 through 4 years who had wheezing in the past 12 months, or 3) those who have any other underlying medical conditions that predispose them to influenza complications. For all other contraindications to use of LAIV see MMWR 2010; 59 (No. RR-8), available at http://www.cdc.gov/mmwr/pdf/rr/rr5908.pdf.
 Administer 1 dose to persons aged 9 years and older.
For children aged 6 months through 8 years:  For the 2012–13 season, administer 2 doses (separated by at least 4 weeks) to children who are receiving influenza vaccine for the first time. For additional guidance, follow dosing guidelines in the 2012 ACIP influenza vaccine recommendations, MMWR 2012; 61: 613–618, available at http://www.cdc.gov/mmwr/pdf/wk/mm6132.pdf.
 For the 2013–14 season, follow dosing guidelines in the 2013 ACIP influenza vaccine recommendations.