The common cold is a viral infectious disease that infects the upper respiratory system. It is also known as acute viral rhinopharyngitis, or acute coryza. Being the most common infectious disease in humans, the cold is mainly caused by coronaviruses or rhinoviruses. Read More click to expand contents
The cold can be caused by more than 200 different viruses. Up to 50% of colds are caused by rhinoviruses, other cold-causing viruses include: Human parainfluenza virus Metapneumovirus Coronavriuses adenovirus Human respiratory syncytial virus Enteroviruses. When a virus manages to overpower the body's immune system, infection occurs. The first line of defense is mucus, which is produced in the nose and throat by the mucus glands. This mucus traps anything inhaled, such as dust, viruses and bacteria. Mucus is a slippery fluid that the membranes of the nose, mouth, throat and vagina produce. When the mucus is penetrated by the virus, which then enters a cell, the virus takes control of the element of the cell which makes protein. It uses this element to manufacture more viruses, these viruses then attack surrounding cells.