Joni Kamiya, Here is information from your factsheet.

"What are some signs and symptoms from a brief exposure to chlorpyrifos?
Chlorpyrifos affects the nervous system of people, pets, and other animals the same way it affects the target pest. Signs and symptoms can appear within minutes to hours after exposure. These effects can last for days or even weeks. During this time, the body is replacing the depleted enzymes in the nervous system so it can function normally again.
Exposure to small amounts of chlorpyrifos can cause runny nose, tears, and increased saliva or drooling. People may sweat, and develop headache, nausea, and dizziness. More serious exposures can cause vomiting, abdominal muscle cramps, muscle twitching, tremors and weakness, and loss of coordination. Sometimes people develop diarrhea or blurred or darkened vision. In severe poisoning cases, exposure can lead to unconsciousness, loss of bladder and bowel control, convulsions, difficulty in breathing, and paralysis."