Norovirus is the buzz killer that can bring a cruise ship home. And now, it looks like the little bug is postponing the fun at Spring Arbor University in Spring Arbor, MI. The university has postponed its graduation ceremony for one week while it tries to contain a norovirus outbreak. Instead of being held this Saturday, the commencement will be held Saturday, May 21. The university says more than 170 students are reporting an illness. University officials are working to contain the outbreak and are consulting with the Jackson County Health Department and the State Health Department. From Spring Arbor University : All non-academic related activities have been cancelled from Wednesday, May 11, through Sunday, May 15, 2011. These activities include alumni events, National Christian College Athletic Association baseball regional tournament, and other public-related events. The fitness room, pool and other facilities are closed to the public through Sunday, May 15. These decisions are preventative and consistent with the medical advice received. Of utmost concern for all of us is the safety and health of our campus community and the families and friends planning on participating in the various academic year-end activities. Spring Arbor University has a responsibility of doing what is in the best interest of our students, faculty, staff and visitors to campus, says University President Charles Webb. According to the Centers for Disease Control , people become infected with the virus by: Eating food or drinking liquids that are contaminated with norovirus, Touching surfaces or objects contaminated with norovirus, and then placing their hand in their mouth, and Having direct contact with another person who is infected and showing symptoms (for example, when caring for someone with illness, or sharing foods or eating utensils with someone who is ill). Food and drinks can easily become contaminated with norovirus because the virus is very small and because it takes a very small amount (fewer than 100 norovirus particles) to make a person sick. Although the virus cannot multiply outside a human body, billions of norovirus particles are shed by infected people. These shed particles can cause illness if they get into food or water.