MARSHALLTOWN, Iowa (KCRG) - Another case of Legionella has been confirmed in the Marshall County outbreak, KCCI reports.

The total is now at 70 cases, according to state officials. So far, there’s only been one death.

On Thursday, the AGWSR school district postponed a field trip to Marshalltown due to the ongoing Legionella outbreak.

“Our students were planning on going to visit some larger industrial and manufacturing facilities,” said Superintendent Ben Petty. Around 100 students were expected to go.

The source of Marshall County’s Legionella outbreak remains unknown, although state and local leaders suspect a cooling tower may be responsible. It’s the unknown that led AGWSR to postpone its field trip.

“It’s been increasing pretty rapidly from what we could tell over the past few d

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