With the multitude of scientific breakthroughs and achievements that we have realized as a society, we have yet to find a cure for the pesky common cold or flu, a fact which may seem slightly alarming in light of the highly publicized bird flu scare. Influenza, also called seasonal flu or simply the flu, is a contagious respiratory illness caused by a variety of flu viruses which often results in fever, headaches, and extreme exhaustion. The common cold is also caused by viruses, although it usually has milder signs and symptoms than the flu. Bird flu (avian influenza) is an infection caused by viruses which occur naturally among birds worldwide. Wild birds carry the viruses in their intestines, but usually do not get sick from them. However, bird flu is very contagious and in domesticated animals (chickens, ducks, turkeys) can cause serious illness or death.
This concept emphasizes the importance of dressing warmly to reduce exposure during cold, windy, or rainy weather. Further, since a pathogenic influence enters through the pores of the skin, an individual is more susceptible to get sick when the pores are open, or when perspiring. So on a cold, windy day, if exercising outdoors or going outdoors immediately after exercising indoors, it is extremely important to dress properly to protect against climatic factors. While sweating or shortly after sweating there is an increased likelihood that pathogenic factors such as wind and cold can enter through the pores, which are wide open.
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