The number of cases of diseases spread by mosquitoes, ticks and fleas in the United States more than tripled over 12 years, rising from 27,388 in 2004 to 96,075 in 2016. Scientists say higher temperatures due to climate change allow these organisms to spread.

Source: “Vital Signs,” Centers for Disease Control and Prevention, May 2018, https://tinyurl.com/sfzbm7h

Data for the graphic are as follows:

Year Number of Cases of Disease
2004 27,388
2005 33,882
2006 30,501
2007 41,408
2008 43,806
2009 47,663
2010 49,397
2011 45,178
2012 54,114
2013 61,146
2014 56,384
2015 55,660
2016 96,075

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