Based on the article below, Michael J. Fox admitted to David Letterman he was bit by a tick and was treated for 3 weeks:
The 35 year old actor kept up his hectic daily grind, but he did postpone an appearance on David Letterman's Late Show. When he finally did appear on the CBS talkfest, he revealed to Letterman: "I got a dose of the Lyme. You feel like crap."
"l got bit by a tick," he confessed. "They're really tiny."
"Then what happens is you get this little red mark. You think it's a rash or you think it's some bad thing, but it's a tick bite."
"Then you are doomed because it's already too late."
Fox, who married to Tracy Pollan and has three kids, 7 year old Sam and 2 year old twins Aquinnah and Schuyler, was put on antibiotics for three weeks -- the standard treatment for Lyme disease -- but docs warn there could be lingering problems.
"Until patients have been medically cleared, they should be careful not to overexert themselves or overexercise."
Tom Skinner form the Centers For Disease control and Prevention in Atlanta, explains that Lyme disease effects each person differently.
"Some people experience brief bouts of what appears to be arthritis," he explains.
"As the disease progresses into later stages, it can lead to nervous system abnormalities, including numbness in different areas of the body, Bell's Palsy (facial paralysis) and in some cases, meningitis."
"In some instances, people can experience irregular heart rythyms, which could be fatal if not treated."
There were 10,000 cases of Lyme reported in the U.S. last year, mostly in the Northeastern and North Central regions. The early symptoms include fatigue, chills and fever, headache, muscle and joint pain, swollen lymph nodes and a red skin rash, says Skinner.
"Some symptoms of Lyme disease may not appear until weeks, months or years after a tick bite," he adds.
"Some people can expect recurring bouts of the disease, especially if the treatment was unsuccessful, so Michael J. Fox is not out of the woods yet."