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Volume 15, Number 11—November 2009

Letter

Low Immunity to Measles and Rubella among Female Guest Workers, Northern Mariana Islands

Vicki StambosComments to Author , Jean-Paul Chaine, Heath Kelly, Mariana Sablan, and Michaela Riddell
Author affiliations: Victorian Infectious Diseases Reference Laboratory, Melbourne, Victoria, Australia (V. Stambos, H. Kelly, M. Riddell); Department of Public Health, Saipan, Commonwealth of the Northern Mariana Islands (J.-P. Chaine, M. Sablan)

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Table

Proportion of guest workers immune to measles and rubella by ethnicity and age group, Northern Mariana Islands, September–October 2006*

Age group, y Proportion immune
Guest workers from China
Guest workers from other countries†
Total no. tested No. (%) measles, 
95% CI No. (%) rubella, 
95% CI Total no. tested No. (%) measles, 
95% CI No. (%) rubella, 
95% CI
15–19 18 17 (94.4), 72.7–99.9 14 (77.8), 52.4–93.6 0
20–24 56 41 (73.2),59.7–84.2‡ 49 (87.5), 75.9–94.8 1 1 (100), 2.5–100§ 1 (100), 2.5–100§
25–29 40 25 (62.5), 45.8–77.3‡ 36 (90.0), 76.3–97.2 10 10 (100), 69.2–100§ 10 (100), 69.2–100§
30–34 18 13 (72.2), 46.5–90.3‡ 15 (83.3), 58.6–96.4 9 9 (100), 66.4–100§ 8 (88.9), 51.8–99.7
35–39 17 14 (82.4), 56.6–96.2 13 (76.5), 50.1–93.2 16 16 (100), 79.4–100§ 15 (93.8), 69.8–99.8
40–44 2 2 (100), 15.8–100§ 2 (100), 15.8–100§ 14 14 (100), 76.8–100§ 11 (78.6), 49.2–95.3
>45
2
2 (100), 15.8–100§
1 (50.0), 1.3– 98.7

6
6 (100), 54.1–100§
5 (83.3), 35.9–99.6
Total 153¶ 114 (74.5), 66.8–81.2# 130 (85.1), 78.3–90.2 56 56 (100), 93.6–100§ 50 (89.3), 78.1–96.0

*CI, confidence interval.
†Philippines (n = 48), Japan (n = 6), South Korea (n = 1), Thailand (n = 1).
‡Significant difference in measles immunity of Chinese workers 20–34 years of age compared with that of Chinese workers of other age groups; p = 0.01.
§1-sided confidence interval.
¶The age of 1 guest worker was not provided by the referring laboratory.
#Significant difference in measles immunity between workers from China and other countries; p<0.001.

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