The infection spreads when enough uninfected mosquitoes are feeding on infected birds, song birds to be specific. At that point, there are so many infected organisms in one area that it spreads to other populations. The type of mosquito that spreads Triple E also spread West Nile. It is called the Culiseta melanura and feeds exclusively on birds. Once it becomes cold and frost occurs, the virus dies down until it becomes warmer and feeding cycles continue. Climate change plays a factor in this cycle as the weather is not as constant. Due to the cold and warm fluctuations in weather, a virus that should have died at a certain time of year continues to pass through organisms. Controlling such virus becomes more and more difficult as the understood life cycle of these virsus’s changes and adapts per year.
HelenBranswell, Helen Branswell, et al. “What to Know about EEE, a Mosquito-Borne Virus on the Rise.” STAT, 25 Sept. 2019, www.statnews.com/2019/09/23/what-to-know-about-eee/.
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