The common cold (also known as nasopharyngitis, acute viral rhinopharyngitis, acute coryza, or a cold)) is a viral infectious disease of the upper respiratory system.
Primarily by rhinoviruses and coronaviruses. More than 200 different types of viruses are known to cause the common cold, with rhinovirus causing approximately 30%-35% of all adult colds. Other commonly implicated viruses include coronavirus, adenovirus, respiratory syncytial virus, and parainfluenza virus. Immunological factors: Low immunity leads to frequent infections Infections: Bacterial, viral Allergens: Food, pollen, dust, mites, others Environment: Extreme cold, heat Poor health Stress Fatigue Nutritional deficiency
Most infectious during the first two to three days of symptoms however is also infectious for a couple of days before the onset of symptoms and may still be somewhat infectious until symptoms have completely resolved.