|Molecular surface of a human rhinovirus, showing protein spikes|
Group IV ((+)ssRNA)
Rhinovirus is the most common virus in humans, and the main cause of the common cold. It is called 'rhinovirus' because it infects the nose. The symptoms are very well known, and affect the whole of the upper respiratory tract, that is, the nose down to the throat. Children may get six to twelve colds a year.
The temperature most suitable for its survival is between 33 ℃ to 35 ℃. This may explain why it is found in the nose, because the nasal cavity is be open to the outside air.