Lyme disease is transmitted by tiny ticks of the Ixodidae family and afflicts about 10,000
people yearly. Initially identified in a group of children in Lyme, Conn.,
the disease has now been found in nearly all states and 18 other countries. About 90 percent
of cases are reported in three areas: the northeast and mid-Atlantic states (Massachusetts to
Maryland), the upper Midwest (Minnesota and Wisconsin), and the Far West (California and Oregon).
The first sign is usually a bull's-eye rash that expands to several inches in diameter before disappearing after a few weeks. In some cases, the rash may take a different form or may be absent altogether. Other early symptoms,
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