A 17-year-old student at Petaluma High School was hospitalized over the weekend with a highly contagious blood infection caused by a bacteria that can develop into meningitis.
School officials sent a warning to parents late Monday with automated phone calls that those who may have had close contact with Christopher Pozzi-Swain, a senior, should alert health officials.
Pozzi-Swain suddenly became ill Saturday and collapsed with exhaustion, said Dr. Lynn Silver Chalfin, Sonoma County's public health officer. He was hospitalized that night.
The teen's condition had greatly improved Tuesday, although he was still in serious condition at a hospital, Silver Chalfin said.
"Chris is feeling much better," Petaluma High principal David Stirrat said.