Croup usually starts with a mild, cold-like illness, characterised by a runny nose, mild fever (around 38.5 °C), and, ...

Head colds are very contagious. When a person with a head cold sneezes or coughs, droplets that contain the virus can travel through the air and reach other people who could contract the virus.

Influenza virus is an infectious agent belonging to the virus family Orthomyxoviridae that causes a respiratory tract infection (influenza or 'flu') in vertebrates. There are three main species ...