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anth 319 midterm review quizlet

Terms in this set (56)

Deforestation, changes in land use, and patterns of water use may alter ecosystems and bring humans into contact with new and re-emerging diseases It was first identified in the United States in 1975 It is cause by the deer tick. Deer tick have 3 feeding stages: larvae, nymph, adult. Larvae:Tick eggs are laid in the spring and hatch as larvae in the summer. Larvae feed on mice, birds, and other small animals in the summer/fall. When a young tick feeds on an infected animal, the tick takes bacteria into its body along with the blood meal, and it remains infected for the rest of its life.
Nymphs: After 1st feeding, the larvae become inactive as they grow into nymphs. In spring, nymphs seek blood meals to grow into adults. When nymph feeds, it can transmit bacterium to a new host (animal or a human). Most human illness occurs in late spring and summer when nymphs are most active and human outdoor activity is greatest. Adult Tick: Adult ticks feed on large animals or humans.
In spring, adult female ticks lay eggs on the ground. Deer do not become infected by adult ticks, but deer are important in transporting ticks and maintaining tick populations.
Symptoms - Affects multiple body systems and produces a range of symptoms. Incubation is from several days to years
First stage includes fever, headache, muscle ache and rash (80% of cases) Large red flat circles.
Second stage includes cardiac and neurological symptoms
Untreated symptoms can worsen causing arthritis and neurological damage.
Prevalence in U.S.~20,000 new cases reported each year & most common vector-borne disease in the United States