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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)

Main Article

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.

Main Article

Page created: December 09, 2010
Page updated: December 09, 2010
Page reviewed: December 09, 2010
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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