http://pissinontheroses.blogspot.com/2014/01/h1n1-swine-flu-predictive-map-of-high.html
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We suspect that the H1N1 Swine Flu honed its virulence at the 2013 Hajj in Saudi Arabia, as such the map in the video is indicative of high density populations which would have primary exposure to Swine Flu returning from the Hajj.

Counties in colored Red and Orange have higher risks. Additionally, high wealth counties and warmer counties have increased risk beyond what is shown on the map. These additional risks correlate to the financial ability to attend the Hajj and the warmer weather the swine flu virus tends to prefer. As always, population density is also a factor. Hence, yellow and green colored counties with those risk modifiers may also have increased risk profiles.