<human>:  what are some reasons for not staying home when I have a cold?
<bot>: From a human perspective, cold viruses that affect the upper respiratory system can be spread by human contact, like sharing utensils or other objects with someone who has the flu, or by breathing in droplets from someone coughing. If you have a cold and you share your phone or any other device with another person, it’s a good idea to cover it with a face mask or another layer of material, especially when you cough or sneeze.