This is because the tick is small and can fall off without the person realizing they have been bitten or because the tick bite occurred in an area of the body that is not readily visible. Just as everyone who is bitten does not come down with Lyme disease, not everyone who has Lyme disease recalls being bitten by a tick. The University of Rhode Island "TickEncounter" website has extensive information about tick identification as well as about labs that test ticks. Testing ticks to see if they are infected is not routinely done but if you live in a Lyme endemic area, check with your local or state health departments to see if they conducted PCR testing on submitted ticks. Because the risk of infection transmission also depends on the infection rate in ticks in the area where the bite occurred, not all tick bites place a person at risk of getting Lyme or other tick-borne diseases. It is possible that if you are bitten by a tick that had a partial blood meal prior to biting you, transmission of the Lyme disease microbe may occur even if the duration of attachment is less than 24 hours. However, some microbes can be transmitted in less than an hour (e.g., Powassan Virus). Generally if a tick is removed within 24 hours, it is quite unlikely that a Borrelia burgdorferi spirochete will be transmitted.
It is important to remove the tick as soon as possible after attachment, as rapid removal reduces the likelihood of transmission of a tick-borne microbe. In most cases, it takes from three to 30 days after being bitten by a tick to develop the initial symptoms of Lyme disease.
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