ENTOM 102 Exam 3 Study Guide
ENTOM 102 Exam 3 Study Guide 8404
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This 2 page Study Guide was uploaded by Irene A. on Thursday March 26, 2015. The Study Guide belongs to 8404 at Washington State University taught by Dr. Owen in Winter2015. Since its upload, it has received 131 views. For similar materials see ENTOM 102 in Biology at Washington State University.
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Date Created: 03/26/15
ENTOM 102 Exam 3 Study Guide 1 Explain how 3 world environments contribute to the spread of leishmania in humans Medical care is difficult to access infections go untreated A lack of sanitation means sewage and waste can seep into the ground creating an ideal breeding area for sand ies which transmit Leishmania to humans Little to no animal control service means an increase in the number of stray dogs and other animals which often carry Leishmania and transmit it to sand ies 2 Explain how the economy relates to disease reference either WNV LB or leishmania Economic downturn tends to increase the prevalence of disease ex WNV increases when foreclosed homes are unmaintained and become breeding grounds for mosquitoes 3 Explain how economic conditions and geographic locations can affect the spread and continuation of diseases such as leishmania and the sand y Location Sand ies lay their eggs in mud so they will be found in places with high rainfall or near a water source Since human populations also seek out water sources the two are going to converge Economy Poor areas with less capacity for sanitation will generate breeding grounds for sand ies with sewage and waste Areas with little to no development will see more sand ies compared to areas with more infrastructure paved roads maintenance etc Lack of medical care means that people who are ill are less likely to be treated 4 Explain in 3 ways why a poor person is more likely to get sick than a rich person using WNV Lyme Disease or Leishmania as examples A lack of sanitation and pest control means insects will be drawn to waste as a potential food source ex sand ies lay eggs in mud contaminated w sewage mosquitoes lay eggs in standing water Houses don39t have barriers window screens etc to keep out ying insects like mosquitoes Limited access to medical care and education about disease vectors Animal control is often nonexistent strayferal dogs can carry Leishmania 5 How does food production affect the spread of WNV Mosquitoes are drawn to water sources and irrigation methods used for large scale growing operations provide a breeding ground for mosquitoes and their eggs Flowering crops are also a source of sugar needed by mosquitoes Areas that produce large amounts of crops are more likely to have high numbers of mosquitoes that are capable of spreading WNV 6 Why do we vaccinate horses against WNV but not humans Horses are expensive animals and so their owners are willing to spend extra money to ensure their health Horses also experience a much higher WNV mortality rate than humans who are unlikely to suffer any severe symptoms Testing a vaccine for humans is too expensive to be worth the cost profits can39t be made from a vaccine when very few people will be sick enough to make it worthwhile 7 How have historical economic factors affected the emergence of Lyme Disease Populations of deer decreased as settlers spread across the US and hunted them deer populations later increased tremendously when the industrial revolution led hunting to be replaced with largescale farming Deer are a common food source for adult ticks A baby boom after WWII led many people to leave cities and live in suburbs which were build in areas with fragmented forests These habitats were amenable to animals like deer which provide food for adult ticks and mice which carry the pathogen that causes Lyme Disease An abundance of food sources for all life stages allowed ticks to ourish in close proximity to people and so increase the spread of Lyme Disease Mosquito life cycle eggs laid in standing water gt larvae live in water feed on organic matter gt pupae on water surface gt adults feed on blood from animals amp sugar from owers get from Tick life cycle eggs gt larvae feed on rodentssmall animals get from Etc gt nymph feeds on medium animals gt adults feed on big animals Sandfly life cycle eggs laid in mud gt larvae feed on organic matterfeces gt pupae gt adults feed on blood get from gerbils mid east only rodents amp
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