El Niño is a naturally occurring weather cycle that has significant impacts on human health. La Niña is the opposite of El Niño, and while El Niño is currently in effect, forecasters predict that El Niño's opposite, El Niño, will take over sometime this summer. El Niño is projected to bring unusual warmth to the Pacific Northwest and the northern Great Plains, and may increase mosquito-borne illnesses.

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