Sneezing, scratchy throat, runny nose -- everyone knows the first signs of a cold, probably the most common illness known. Although the common cold is usually mild, with symptoms lasting 1 to 2 weeks, it is a leading cause of doctor visits and missed days from school and work. According to the Centers for Disease Control and Prevention, 22 million school days are lost annually in the United States because of the common cold.
In the course of a year, people in the U.S. suffer 1 billion colds, according to some estimates.
Wow. I am almost disappointed that I'm perfectly fine. No skin reactions. No
soreness. No muscle aches. No drama.
And no flu, although a single dose of the H1N1 swine flu vaccine probably
offers no protection. NIH Director Tony Fauci says that my experience is
typical -- those of us who got the swine flu shot haven't had any unusual
Earlier this week, I went to a two-day swine-flu symposium for journalists
featuring all of CDC's top researchers (and HHS Secretary Kathleen Sebelius,
Children have about 6 to 10 colds a year. One important reason why colds are so common in children is because they are often in close contact with each other in daycare centers and schools. In families with children in school, the number of colds per child can be as high as 12 a year. Adults average about 2 to 4 colds a year, although the range varies widely. Women, especially those aged 20 to 30 years, have more colds than men, possibly because of their closer contact with children. On average, people older than age 60 have fewer than one cold a year.
In the U.S., most colds occur during the fall and winter. Beginning in late August or early September, the rate of colds increases slowly for a few weeks and remains high until March or April, when it declines. The seasonal variation may relate to the opening of schools and to cold weather, which prompt people to spend more time indoors and increase the chances that viruses will spread to you from someone else.
Seasonal changes in relative humidity also may affect the prevalence of colds. The most common cold-causing viruses survive better when humidity is low—the colder months of the year. Cold weather also may make the inside lining of your nose drier and more vulnerable to viral infection.