A Study of Hepatitis A Seropositivity in Dallas County, 1998-1999

Fulda, Kimberly G., A Study of Hepatitis A Seropositivity in Dallas County, 1998 – 1999. Master of Public Health (Epidemiology), May 2001, 39 pp., 4 tables, 9 figures, references, 28 titles. The purpose of this study was to determine incidence rates per 100,000 population of hepatits A (HAV) in Dallas County for 1998 and 1999. Individuals who tested seropositive for hepatitis A between January 1, 1998 and December 31, 1999 were included. The variables of interest were sex, race, age, Zone Improvement Plan (ZIP code), and date of occurrence. Rates for 1998 were 1.9 times higher in Dallas County than the United States. In 1999, the Dallas County rate increased over 1.6 times. Rates were significantly higher in males for both years, and rates were highest among Hispanics and lowest among Blacks. Differences in age distribution varied between years by increasing in ages 50 and older in 1999. Several ZIP codes exceeded rates of 20 per 100,000 for both 1998 and 1999. Dallas County met the Advisory Committee on Immunization Practices guidelines for routine vaccination of all children in 1999.