Klebsiella liver abscess: a coast-to-coast phenomenon.

!30 years of age are at higher risk of developing acute hepatitis A than are those aged 140 years (OR, 5.5; 95% CI, 1.2– 23.3). Patients who acquired HIV infection during sex had higher rates of natural hepatitis A immunity than did those who acquired HIV infection parenterally (61% vs. 38%; ). P p .13 These data support the recommendation of hepatitis A vaccination for patients with HIV infection in developed countries, particularly white patients aged !30 years, because most are not naturally immune. On the other hand, for recent immigrants from Africa and Latin America with HIV infection, prescreening for hepatitis A virus IgG antibody is recommended before routine hepatitis A vaccination, because a large proportion of such patients are naturally immune.