Mosquitoes
The greatest threat to humans comes from mosquitoes. Carrying various pathogens, mosquitoes cause 750,000 casualties annually. How can such a tiny creature harbor such a immense threat? The most well-known pathogen carried by mosquitoes is malaria. Malaria alone claims 400,000 lives worldwide. Of course, they also carry other pathogens.
All of them are serious diseases for humans. For example, dengue fever, yellow fever, encephalitis (West Nile virus), and more. Perhaps you think Japanese mosquitoes are safe? In fact, Japan also experiences no small number of cases of dengue fever and encephalitis caused by mosquitoes. Although not prominent, outbreaks of dengue fever and others are due to mosquitoes.
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