PORTLAND, Ore. (AP) — At least 30 children and adults are believed to have been affected at a Coos Bay childcare center where they were exposed to pesticide, according to a state investigation.

The Oregon Health Authority released the findings Monday about its investigation of the May outbreak, the Oregonian/OregonLive reported .

Children and employees at the Coos Bay Children's Academy Inc. reportedly suffered respiratory, eye and skin problems, according to the investigation. The harm was considered minimal, state officials said.

Officials would not say how many of the 30 people affected were children.

Improper application of flea spray designated for use in and around animal housing led to the incident, the investigation determined.

A preliminary count in June said 43 children and seven adults had reported health problems after the outbreak. Investigations later found that not all of the initial cases were related to the day care, said Jonathan Modie, a state spokesman.

The owner of the day care, Elizabeth Ewing, and her husband Gerald Ewing were fined more than $2,000 by the Oregon Department of Agriculture and the state's Occupational Safety and Health Administration for various violations regarding the incident.

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Information from: The Oregonian/OregonLive, http://www.oregonlive.com