Five Modesto residents were treated at a hospital Tuesday morning after they were exposed to high levels of carbon monoxide inside the Tokay Avenue home where they were sleeping. "Headache and stomachache were the main symptoms," said Johnny Hutson, one of the five who was hospitalized. "And that's exactly what I had when I woke up." The first to become sick was a young woman. The four other occupants of the home were unaware carbon monoxide was the cause of her symptoms. They called 911 and she was taken to a nearby hospital by ambulance. Hospital staff members diagnosed the woman with carbon monoxide poisoning and alertly contacted a Modesto Fire Department dispatcher within the first hour of her hospitalization, according to Modesto Fire Division Chief Tim Tietjen.