Where does a cold live?

A cold is caused by viruses, primarily rhinoviruses, which thrive in the upper respiratory tract of humans. These viruses are typically spread through respiratory droplets or by touching contaminated surfaces. Colds are more common in colder months when people are indoors and in closer proximity to one another, allowing for easier transmission. Ultimately, colds "live" in the human body, specifically in the nasal passages and throat, where they reproduce and cause symptoms.