Rhinoviruses are a group of viruses that primarily cause the common cold. They are small, single-stranded RNA viruses belonging to the Picornaviridae family. Rhinoviruses are highly contagious and spread through respiratory droplets when an infected person coughs or sneezes, as well as by touching contaminated surfaces. These viruses thrive in cooler temperatures, making the upper respiratory tract an ideal environment for infection. Symptoms of a rhinovirus infection typically include a runny nose, sore throat, cough, and sneezing. While rhinoviruses are not usually serious, they can lead to complications in individuals with weakened immune systems or pre-existing respiratory conditions.