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For anyone who is walking outdoors from spring to through fall, particularly in areas where there is high grass, weeds and shrubs or wooded areas, or that are known to be tick-problem areas, taking measures to protect yourself from a bite from one of these creatures is part of outdoor safety. Although insect repellents are used, ticks are actually a member of the arachnid family, along with spiders and scorpions. They attach onto a host as the human or animal brushes against higher grasses or shrubs. They may spend several days feeding, completely unnoticed by the host.
Why is it so important to use a tick repellent and to take other precautionary measures? What is so dangerous about these creatures? Ticks are a threat because they can easily carry and transfer disease. The deer tick, as well as other types of these creatures, can infect both humans and animals with the pathogens that can lead to Lyme disease. Not every tick is a carrier. Lyme disease is more common in certain geographic regions, including the northeastern United States and parts of the midwest.
In about half of cases a bite from an infected tick will cause a characteristic rash that looks like a bull's eye. It may also simply be red or blotchy. Flu-like symptoms will start appearing whether the rash does or not. If unattended (Lyme disease is easily treated with antibiotics if addressed early on) Lyme disease can lead to very serious and sometimes chronic health problems including joint pain, neurological 
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problems, heart, eye, respiratory and gastrointestinal problems.
Animals such as the family dog can also contract Lyme disease from a tick bite. The infection will at first cause symptoms such as a loss of appetite, swelling and listlessness. Serious problems with the heart, kidney, liver, eye and nervous systems can also develop in animals if left untreated.