Table 1.

Prevalence of antibodies to hepatitis A virus (anti-HAV) in 527 travelers screened at a central injection clinic of a health maintenance organization

Group characteristics	No. of subjects tested	No. (%) of subjects positive for anti-HAV
Age, yr
Overall*	527	146 (27.7)
18-50 (ie, born after 1945)	212	54 (25.5)
≥51 (ie, born in 1945 or earlier)	315	92 (29.2)
Born in nonindustrialized country†	75	62 (82.7)
Previously traveled to areas of endemic hepatitis A	420	135 (32.1)
Born in industrialized country
Overall	428	71 (16.6)
Age 18-50 yr (ie, born after 1945)‡	158	10 (6.3)
≥51 yr (ie, born in 1945 or earlier)	270	61 (22.6)

^*Includes patients who did not fit measures of other groups because of indefinite birth history.

^†Includes 1 subject each from Spain, Venezuela, Iran, Tanzania, Rwanda, Zambia, Mexico, and Thailand; 2 from Peru; 3 each from Yugoslavia and unspecified African countries; 6 from Philippines; 12 each from China and Vietnam or Cambodia; and 29 from India.

^‡Includes 1 subject each from Netherlands and Sweden; 2 each from Australia, Canada, Scotland, and Germany; 3 each from England, Japan, and Ireland; and 139 from United States.