Colds are contagious during the first two to three days, so stay home and rest up. Because this is a viral infection, antibiotics are not effective in treating a cold.
Influenza — or the flu, as it’s better known is another upper respiratory illness. Unlike the common cold, the flu can develop into a more serious condition such as pneumonia. This is especially true for young children, older adults, pregnant women, and people with immunocompromising health conditions such as asthma, heart disease or diabetes.