Why is there a canine Lyme disease immunization but nothing for humans?—JUANITA A. CARNES, FNP-BC, Westfield, Mass.

A Lyme disease vaccine (LYMErix) was developed in the early 1990s and received FDA approval in 1998. The vaccine was recommended for anyone who lived, worked, or recreated in high-risk areas. Three doses were administered over one year for 80% efficacy; however, immunity diminished over time. In December 1999, a class-action lawsuit was filed against the manufacturer claiming that LYMErix could cause an incurable form of autoimmune arthritis. The manufacturer voluntarily stopped producing the vaccine in 2002, citing “insufficient consumer demand.”—JoAnn Deasy, PA-C, MPH (148-10)