Officials say they are concerned that cases of Lyme disease have in fact doubled since 1991 and they believe many cases go unreported.
The CDC says more than 21 thousand cases of the disease are reported in the U.S. each year, and it is the most common mosquito born virus in the country, more so than even West Nile virus.
From 2003 to 2005, the CDC received 64,382 reports of people with Lyme disease in 46 states and Washington, D.C.
There were fewer than 10,000 reported cases of Lyme disease in 1991, when the CDC began tracking Lyme disease nationally.
In a weekly report the CDC says in 2005, the most common place for Lyme disease was anywhere in the north-eastern, mid-Atlantic, and north-central states.
The CDC believes the increase can be attributed to several factors, including a true increase in disease incidence and better detection and laboratory-based surveillance.