The number of University of Southern California students sickened by a contagious gastrointestinal virus has risen to about 275, school officials announced. The news comes just days after 200 students at Georgetown University were infected with a similar virus.

However, the outbreak may have peaked, Dr. Lawrence Neinstein announced, as the number of students in search for medical help appeared to be declining Sunday and Monday after the initial reports of illness on Friday and Saturday.

Ten students needed hospitalization because other medical conditions put their lives in danger. They were experiencing vomiting, diarrhea and abdominal cramps. Student suffering serious dehydration were given intravenous fluids.

The school officials have already taken measures to prevent other infections. They ordered 3,000 bottles of hand sanitizers and 2,000 containers of sanitizing wipes to distribute to students attending classes. Students were strongly recommended hand washing in order to prevent the spread of the virus. Also, they should not share foods and beverages these days.

Those affected by the infection are recommended staying at home, take plenty of liquids and not socialize until they are feeling better, Dr. Neinstein said. He added that the virus can be contagious for more than a few days after an individual gets well.

USC spokesman James Grant said it is difficult to trace where the virus came from, but it appears to be human-to-human contact. An inspection by Los Angeles County health inspectors at the campus dining facility called “Everybody’s Kitchen” found no evidence of any contamination. Therefore, the facility was reopened.