When the Broncos run a lot of plays, they have a propensity to cough up the football, a flaw that lost them their last three regular season games.

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"Just in general, when we look at cough and respiratory symptoms, there's a lot of overlap, " said Dr. Susan Gerber, an epidemiologist at the Centers for Disease Control and Prevention (CDC).

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The word is going out that a lot of people need to get a pertussis booster shot Pertussis, more commonly known as whooping cough, is a bacterial infection that is very dangerous and sometimes fatal in young infants, whose immune systems are too immature to protect them.

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