Nymphs feed primarily on smaller animals. These include squirrels, mice, lizards, rabbits, and birds that feed on the ground. Migratory birds help distribute ticks throughout the country. Learn more about the types of ticks.
Support LymeDisease. Ask your questions here. Home Member Login Join. Search LDo. Donate Now. Menu Lyme Basics. Lyme Disease Research. Contact LymeDisease. About Ticks and Lyme Disease. The information on Lyme disease presented on this web site has been reviewed and approved by one or more members of our Medical Leadership Board. Ticks generally live two to three years and have a four-stage life cycle.
The four stages of their life cycle include egg, larva, nymph, and adult. They are almost impossible to find on your body but have not been proven to transmit tick-borne illness. Nymphal ticks cause the majority of Lyme disease infections in people. Because of their very small size and painless bite, these ticks are generally not detected.
Nymphs are most active in the late spring and summer months. Due to their small size and flat shape, they can be difficult to find on your body. Adult ticks that carry Lyme disease feed and mate primarily on deer. You may also find adult ticks on dogs, horses, and domesticated animals. Ticks that carry Lyme disease can be found anywhere their hosts live, in short, anywhere in the world.
They prefer moist shady areas. Although deer are important as reproductive hosts in the lifecycle of these ticks, other vertebrate animals actually infect the ticks with disease organisms — not the deer. These animals include white-footed mice, chipmunks, shrews, several species of ground feeding birds American robin, finches, wrens, bluejays, etc.
If the tick is in a sheltered spot, it can go unnoticed. A blacklegged tick will attach to its host and suck the blood slowly for several days. If the host animal has certain bloodborne infections, such as the bacteria that cause Lyme disease, the tick may ingest the pathogen and become infected. If the tick later feeds on a human, that human can become infected.
After feeding, the blacklegged tick drops off and prepares for the next life stage. At its next feeding, it can then transmit the infection to the new host. Once infected, a tick can transmit infection throughout its life. If you remove a tick quickly within 24 hours , you can greatly reduce your chances of getting Lyme disease. It takes some time for the Lyme disease-causing bacteria to move from the tick to the host.
The longer the tick is attached, the greater the risk of acquiring disease from it. Lifecycle of blacklegged ticks. The ticks need to have a new host at each stage of their life, as shown below: This diagram shows the lifecycle of blacklegged ticks that can transmit Lyme disease. Links with this icon indicate that you are leaving the CDC website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. You will be subject to the destination website's privacy policy when you follow the link. CDC is not responsible for Section compliance accessibility on other federal or private website. However, these signs and symptoms may occur within a month after infection:.
From 3 to 30 days after an infected tick bite, an expanding red area might appear that sometimes clears in the center, forming a bull's-eye pattern. The rash erythema migrans expands slowly over days and can spread to 12 inches 30 centimeters across. It is typically not itchy or painful. If untreated, new signs and symptoms of Lyme infection might appear in the following weeks to months.
These include erytyema mirgrans, joint paint, nausea and vomiting, diffuse rash and neurological problems. Several weeks after infection, some people develop heart problems, eye inflammation, liver inflammation hepatitis and severe fatigue. Scholarship Sani Marc Scholarship.
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