(Marshalltown, Iowa) – Another case of Legionella has been confirmed in the Marshall County outbreak. State officials said as of Saturday, the total number of confirmed cases of the disease was up to 70. One death was associated with the outbreak.

On Thursday, the AGWSR school district postponed a field trip to Marshalltown due to the ongoing Legionella outbreak. District officials said around 100 students were planning on visiting some of the larger industrial and manufacturing facilities.

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, a new date for which has not yet been set.

The Legionella bacteria occur naturally and can be spread through water droplets. Health professionals advise that there’s a low risk of catching Legionella, but to seek medical help if you have pneumonia-like symptoms.