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> The dreaded mosquito Part 2
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The dreaded mosquito Part 2 (Teacher: Michael)
The adult is eventually fully formed after going through
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pupal stage, with
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males usually emerging earlier. These stay hovering over
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surface of
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water, mating taking pace soon afterwards as
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females emerge. However, before she can lay viable eggs she will need to take
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blood meal from
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mammal or bird.
Mosquitoes are attracted to
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host by
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number of stimuli, particularly heat and exhaled carbon dioxide.
Having found
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host she will settle and probe with her proboscis (piercing- organ) to locate
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blood vessel, whereupon she will typically inject
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small amount of anticoagulant saliva into
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bite puncture to prevent
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blood from clotting. It is
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reaction of
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host's antibodies to
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attack which causes
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redness, swelling and irritation at
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site of
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bite. In
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tropics
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female mosquito is without doubt
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most important vector of disease, carrying malaria, filariasis, yellow fever, dengue fever and forms of encephalitis.
A number of these virus diseases can also occur in
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cooler, temperate zones like Malta's, but in our case we are less at risk since we live on
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island. It is only through their bloodsucking habits
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disease can be spread by mosquitoes.
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