West Nile Virus Case Study

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The environmental factors which may have influenced the emergence of West Nile Virus include hydrogeography, urbanization, precipitation, temperature, and vector species feeding habits. These factors seem to have increased the abundance of mosquitoes as well as infection rates in humans. The increase in temperatures increases the abundance of vector mosquito species since they can reproduce and survive for longer periods, which, in turn, increases the rate of transmission of the disease.
During low levels of precipitation, the level of West Nile Encephalitis infections in humans, increases stagnant water aggravates the breeding of mosquitoes. Similarly, increases in hydrogeographic areas, which includes the density of surface water present
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The control measures are based on eliminating the disease vector, which starts with identifying and mapping the immature habitats by season. Controlling the breeding of mosquitoes, the West Nile Virus vector involves the use of pesticides to eradicate both immature and adult mosquito populations. The pesticides used include both larvicides and adulticides, which should be used according to the pesticide laws and regulations of a particular location.
Other control measures include using insect repellents when outdoors. The repellents contain IR3535, picaridin, DEET, para-menthane-diol products, and oil of lemon eucalyptus. One might also use protective clothing from dusk to dawn or avoid going outdoors during mosquito peak hours. It is also important to install or repair window panes and doors to keep mosquitoes outside. Another control measure includes emptying stagnant water around the home compound, for example, water in pet water dishes, pol covers, buckets, gutters, and flower
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Since spraying is one of the most effective control measures, people are concerned with contamination of resources, such as water and air, which poses health threats. There is also a likelihood of pesticide runoff to surface waters in addition to the potential for poisoning to fish and useful non-target

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