Reovirus is a type of virus that can cause a wide range of illnesses, including respiratory infections, gastroenteritis, and meningitis. There are a few different synonyms for the term reovirus that can be useful to know. For example, the virus is sometimes referred to as a respiratory enteric orphan virus, or REO virus for short. It may also be referred to as a rotavirus, which is a related type of virus that primarily causes diarrhea in young children. In some cases, the term coltivirus is also used to describe reoviruses, as this name reflects their ability to infect horses and other animals.