Most infections are endemic, but sharp small epidemics occasionally occur with types 1 and 2. Parainfluenza virus infections are primarily childhood diseases, the highest age-specific attack rates for croup occur in children below the age of 3 years.
Olinger is an ancient Norman name that arrived in England after the Norman Conquest of 1066. The name Olinger comes from the name of the famous St. Leger.
The Old High German name parallels the Middle Latin name Marchia Orientalis (eastern borderland ), alternatively called Marchia austriaca. The shorter latinized name Austria is first recorded in the 12th century. It has occasionally led to confusion, because, while it renders the Germanic word for east it is reminiscent of the native Latin term for south, auster.