Table 2.
Importation and Vaccination Status of Measles Cases and Crude Measles Incidence Rate (IR) by Year in the United States, 2001–2015
| Year | No. of Measles Casesa | No. Imported Measles Casesa,b | Imported Cases, % (95% CI)a,b | No. of US-Resident Casesc | No. of Vaccinated Casesc,d | Vaccinated Patients, % (95% CI)c,d | Annual IR per Million Population (95% CI)c |
|---|---|---|---|---|---|---|---|
| 2001 | 116 | 54 | 46.6 (37.2–56.1) | 81 | 24 | 29.6 (20.0–40.8) | 0.28 (0.22–0.35) |
| 2002 | 44 | 18 | 40.9 (26.3–56.8) | 36 | 5 | 13.9 (4.7–29.5) | 0.13 (0.09–0.17) |
| 2003 | 56 | 24 | 42.9 (29.7–56.8) | 38 | 9 | 23.7 (11.4–40.2) | 0.13 (0.10–0.18) |
| 2004 | 37 | 27 | 73.0 (55.9–86.2) | 24 | 4 | 16.7 (4.7–37.4) | 0.08 (0.05–0.12) |
| 2005 | 66 | 24 | 36.4 (24.9–49.1) | 59 | 7 | 11.9 (4.9–22.9) | 0.20 (0.15–0.26) |
| 2006 | 55 | 31 | 56.4 (42.3–69.7) | 42 | 11 | 26.2 (13.9–42.0) | 0.14 (0.10–0.19) |
| 2007 | 43 | 29 | 67.4 (51.5–80.9) | 31 | 7 | 22.6 (9.6–41.1) | 0.10 (0.07–0.15) |
| 2008 | 140 | 25 | 17.9 (11.9–25.2) | 127 | 7 | 5.5 (2.2–11.0) | 0.42 (0.35–0.50) |
| 2009 | 72 | 21 | 29.2 (19.1–41.1) | 65 | 8 | 12.3 (5.5–22.8) | 0.21 (0.17–0.27) |
| 2010 | 63 | 39 | 61.9 (48.8–73.9) | 47 | 6 | 12.8 (4.8–25.7) | 0.15 (0.11–0.20) |
| 2011 | 220 | 80 | 36.4 (30.0–43.1) | 196 | 29 | 14.8 (10.1–20.6) | 0.63 (0.55–0.72) |
| 2012 | 55 | 21 | 38.2 (25.4–52.3) | 43 | 11 | 25.6 (13.5–41.2) | 0.14 (0.10–0.18) |
| 2013 | 187 | 51 | 27.3 (21.0–34.3) | 164 | 13 | 7.9 (4.3–13.2) | 0.52 (0.44–0.60) |
| 2014 | 667 | 63 | 9.5 (7.3–11.9) | 658 | 53 | 8.1 (6.1–10.4) | 2.06 (1.91–2.22) |
| 2015 | 191 | 28 | 14.7 (10.0–20.5) | 178 | 36 | 20.2 (14.6–26.9) | 0.56 (0.48–0.65) |
| Overall | 2012 | 535 | 26.6 (24.7–28.6) | 1789 | 230 | 12.8 (11.4–14.5) | 0.39 (0.37–0.41) |
a
All measles cases and imported measles cases reported in the United States are included (ie, US residents, foreign visitors, and patients with unknown residency status).
b
Internationally imported cases had an exposure period outside the United States (7–21 d before rash onset) and rash onset within 21 d of entry into the United States.
c
Foreign visitors (n = 220) and patients with unknown residency status (n = 3) were excluded, allowing for the use of US census data and to assess US-based vaccine recommendations.
d
One or more doses of a measles-containing vaccine.