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The tornado is on the upper end of the lowest rating of the EF scale, according to Cohen.

It was classified as a weak E-F1, which the National Weather Service considers a moderate tornado on its scale from EF-0 to EF-5.

"And both infections are made more severe when there is a co-infection with EF. Previous studies have shown that part of the reason for this is that EF helps E. coli survive in low-iron environments such as the urinary tract or the bloodstream. We wanted to see what else might be happening."

With the EF-5, it’s on grass; we obviously all know what grass looks like so we had a little more license to go, “OK. What is the coolest, scariest-looking tornado that we can find?”

Tornadoes are rated on the five-point Enhanced Fujita scale not by wind speed but by damage, and EF-5 tornadoes are exceedingly rare, making up only roughly 1% of all tornadoes.