Northern temperate regions of the world.
In general, the risk for developing Lyme disease after a tick bite is only 1 - 3%. The risk varies depending on different factors: 1  The longer the tick has fed, the greater the risk. 2  Nymph ticks carry a greater risk than adult ticks, probably because they are often too small to be detected (about the size of a pinhead). The exact time of year for risk depends on a geographic region's seasons and how they affect the tick's breeding cycle. In general, the highest risk for Lyme disease onset is from June through August, and the lowest risk is from December through March. View & Print In-Depth Report ». Anyone exposed to ticks is at risk for Lyme disease and other tick-borne diseases. Pets are also at risk. Naturally, anyone who is regularly outside in areas where tick rates are high has a greater than average risk for becoming infected. Age. The highest reported incidence of Lyme disease occurs among children 5 - 14 years old and adults 45 - 54 years old. The exact time of year for risk depends on a geographic region's seasons and how they affect the tick's breeding cycle. In general, the highest risk for Lyme disease onset is from June through August, and the lowest risk is from December through March. View & Print In-Depth Report ». Recommend on Facebook Tweet ShareCompartir. Of the many different tick species found throughout the world, only a select few bite and transmit disease to humans. These maps provide general insight into the expected distribution these human-biting ticks in the contiguous United States. Populations of ticks may be found outside noted areas. Naturally occurring populations of the ticks described below do not occur in Alaska; however, the brown dog tick is endemic in Hawaii. Note that adult ticks are the easiest to identify and male and female ticks of the same species may look different.  1 Lyme disease is an infection caused by the corkscrew-shaped bacterium Borrelia burgdorferi, a member of the family of spirochetes. Lyme Disease Lyme disease is caused by bacteria called Borrelia burgdorferi and is transmitted to humans through the bite of infected blacklegged ticks. Typical symptoms include fever, headache, fatigue, and a characteristic skin rash called erythema migrans. Some people never develop a bull’s-eye rash. Some people only develop arthritis, and for others nervous system problems are the only symptom of Lyme disease. Many of the symptoms of Lyme disease are similar to those of other diseases. The number of US counties experiencing high incidence of Lyme disease has grown considerably from 1993 through 2012, according to a study published online July 15 and in the August issue of Emerging Infectious Diseases.  Lyme disease is the most common disease spread by ticks in the Northern Hemisphere. It is estimated to affect 300,000 people a year in the United States and 65,000 people a year in Europe. Infections are most common in the spring and early summer. Lyme disease, also known as Lyme borreliosis, is an infectious disease caused by bacteria of the Borrelia type. The most common sign of infection is an expanding area of redness, known as erythema migrans, that begins at the site of a tick bite about a week after it has occurred Lyme disease has a wide distribution in northern temperate regions of the world. In the United States, the highest incidence occurs in the. Knowing the complex life cycle of the ticks that transmit Lyme disease is important in understanding the risk of acquiring the disease and in finding ways to prevent it. Joint pain can be mistaken for other types of arthritis, such as rheumatoid arthritis, and neurologic signs can mimic those caused by other conditions, such as multiple sclerosis. At the same time, other types of arthritis or neurologic diseases can be misdiagnosed as Lyme disease. Research in the eastern United States has indicated that, for the most part, ticks transmit Lyme disease to humans during the nymph stage, probably because nymphs are more likely to feed on a person and are rarely noticed because of their small size (less than 2 mm). Joint pain can be mistaken for other types of arthritis, such as rheumatoid arthritis, and neurologic signs can mimic those caused by other conditions, such as multiple sclerosis. At the same time, other types of arthritis or neurologic diseases can be misdiagnosed as Lyme disease. Early Lyme Disease: The early stage of Lyme disease is usually marked by one or more of the following symptoms and signs: In rare cases, Lyme disease acquired during pregnancy may lead to infection of the fetus and possibly to stillbirth, but adverse effects to the fetus have not been conclusively documented. Joint pain can be mistaken for other types of arthritis, such as rheumatoid arthritis, and neurologic signs can mimic those caused by other conditions, such as multiple sclerosis. At the same time, other types of arthritis or neurologic diseases can be misdiagnosed as Lyme disease.
http://www.nytimes.com/health/guides/disease/lyme-disease/risk-factors.html http://www.nytimes.com/health/guides/disease/lyme-disease/risk-factors.html http://www.cdc.gov/ticks/geographic_distribution.html http://www.cdc.gov/lyme/resources/brochure/lymediseasebrochure.pdf http://www.medscape.com/viewarticle/848110 https://en.wikipedia.org/wiki/Lyme%27s_Disease http://wonder.cdc.gov/wonder/prevguid/p0000380/p0000380.asp http://wonder.cdc.gov/wonder/prevguid/p0000380/p0000380.asp http://wonder.cdc.gov/wonder/prevguid/p0000380/p0000380.asp
lyme disease what determines geographical region