more, a lot of times it occurs within college campuses and specifically within dormitories. as the weather gets colder people are inside more so you see these spikes in the fall and winter and again in the early spring when it's cooler outside and even among people who are vaccinated, brooke, the vaccine tends to wear off about 10 to 15 years so most people get the vaccine for mumps between four and six years old, right around the time they're starting college and being in these dormitories is coinciding with the time the vaccine starts to lose its effectiveness so it's a combination of all these things. >> how would you know if you had mumps? >> well, the symptoms of mumps can be somewhat vague but also characteristic because people tend to get swelling. that's what people tend to think of, the perrot tid glands, those get swollen. that can be characteristic.