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

Vicki Stambos

, 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.

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