Across the Boston University campus, students are experiencing various symptoms of a new virus spreading from dorm to dorm, prompting several changes in dining halls across campus.

“We have had a number of people in [to Student Health Services],” BU spokesman Colin Riley said. “It’s trickling now, it’s down to the number of people who normally come in with upset stomachs, diarrhea and vomiting.”

For Claflin Hall resident Eric Silver, the illness required more than a trip to Student Health Services.

“From Wednesday night until Thursday morning, I was puking my guts out all night,” the College of Arts and Sciences sophomore said.

Silver said since he got sick last week, he has noticed several changes in the West Campus dining hall.

“There is no self-service now,” he said. “Everything … they have to have someone serve it to you.”

In a letter emailed to BU students, Dean of Students Kenneth Elmore addressed the issue and said the virus, believed to be a Norovirus, can travel from student to student through ingestion.

“Dining Services has increased employee training (reinforcing procedures already in place),” he said in the email. “Additionally, in order to reduce the likelihood of foods becoming contaminated by students, Dining Services has eliminated unsupervised self-service food stations, where possible, and will be installing alcohol-based hand sanitizers at the entrances of all residence hall dining rooms.”

Elmore said the reason for sending the email was precautionary.

Although the virus is generally classified as a Norovirus, which includes many virus types, Elmore said the Massachusetts Department of Health believes it to be a Norwalk-type virus.

“Wash your hands, wash your hands, wash your hands,” he warned.