The number of people who have become “acutely ill” after eating at a San Jose restaurant has grown to more than 40 as of Tuesday, and Santa Clara County health officials are searching for others who may be ill with Shigella, a severe stomach ailment that was probably spread by an infected food handler. More than 40 people who ate at the Mariscos San Juan restaurant at 205 North 4th Street in San Jose on Friday or Saturday have become acutely ill with fever, abdominal pain, and diarrhea, including 12 who are being treated in intensive care units, according to a release issued Tuesday morning by the Santa Clara County Public Health Department.