There does not seem to be a close association of head colds and rainy weather, but many sufferers associate the two.
The wettest part of the year approaches, and at the same time colds and upper respiratory infections proliferate.
Those who are sick can bet that what they have is a simple cold caused by a virus. Influenza is the cause in probably less than 10 percent of the illnesses, according to Costa Rican health statistics.
That cold probably is the product of a sneeze by someone else or a bug picked up from an infected surface. Health authorities universally recommend hand washing as a protection.
Since children generally have more head colds a year than adults, school time is also infection time, and the youngsters bring home the bug.
The University of Pennsylvania estimated that there are a billion head colds in the United States each year, and travelers seem to be more vulnerable, perhaps due to association with foreign viruses. There are about 200 viruses associated with the common cold, with rhinoviruses the most common.1