The number of patients continues to grow after a Waterloo monster truck show over the weekend.

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On the evening of Saturday, February 12th, the National Cattle Congress hosted a monster truck event called Waterloo IA Monster Truck Chaos. Doors opened at the Waterloo venue at 4:00 PM that afternoon and several hours later Waterloo Fire Rescue crews were arriving at the Hippodrome, according to initial reports from KWWL. Crews showed up at approximately 9:20 PM that evening, just as the show was wrapping up.
Black Hawk County Emergency Management Office officials posted on their Facebook page the next day, a warning to those who had attended the event.

"Anyone that was in attendance to the monster truck show on Saturday, Feb. 12th at the Hippodrome, please monitor yourself & others you attended with; family, friends, & children for signs and symptoms of Carbon Monixide poisoning."

The most recent reports have found that exactly 77 individuals who had attended the Saturday evening monster truck rally were confirmed to have Carbon Monoxide poisoning, according to KWWL.

Hospitals all across the Cedar Valley admitted patients over the course of the next few days who had been to the event.

MercyOne Northeast Iowa saw 23 patients...

UnityPoint Allen Hospital in Waterloo had 31 patients...

Grundy County Memorial Hospital reported 23 patients...

Photo By: Elwin Huffman - Townsquare Media
Photo By: Elwin Huffman - Townsquare Media
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Towards the end of the show, reports claimed that attendees were showing signs of Carbon Monoxide poisoning such as vomiting and lightheadedness.

According to the Mayo Clinic, the most common symptoms of Carbon Monoxide poisoning are dull headaches, weakness, dizziness, nausea or vomiting, shortness of breath, confusion, blurred vision, and loss of consciousness.

If you or someone you know is exhibiting these symptoms after attending the event, you are encouraged to call 9-1-1 or go to your local hospital.

We will continue to keep you updated as the story continues to develop.

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