Norovirus By: Kyle Curtis Noroviruses are very contagious. You can get it by contaminated food or water. The norovirus is a very contagious virus. It can cause the stomach and intestines to swell and cause very severe stomach pain. This man looks like he has severe stomach pain One way to get the Norovirus is by drinking contaminated water. These two videos show what the norovirus is and what it does and how fast it can be contracted.