Acute Babesiosis Caused by Babesia divergens in a Resident of Kentucky

Abstract

response is of long duration. It is striking that the loss of reactivity over a period of more than 35 years was very low-by a factor of less than two in persons with a remote history of vaccination (4 percent of CD8+ T lymphocytes), as compared with recently vaccinated persons (6.5 percent of CD8+ T lymphocytes). The durability of vaccinia-specific CD8+ T-lymphocyte responses is very good, suggesting that those previously vaccinated still have a significant measure of protection. 1. Cohen J. Bioterrorism: smallpox vaccinations: how much protection re-mains? Science 2001;294:985. 2. Garba ML, Pilcher CD, Bingham AL, Eron J, Frelinger JA. HIV anti-gens can induce TGF-beta(1)-producing immunoregulatory CD8+ T cells.