By Roland Larrabee, M.D.
Bronchiolitis is a lung infection caused by a virus. The average age of children who get bronchiolitis is 6 months. They are seldom older than 2 years.
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Influenza, or flu, is a virus infection of the air passages. Outbreaks of flu occur almost every year, usually in winter. Each season a different strain of flu virus may be responsible for the outbreak. In some years, the flu strain may be particularly severe and cause many deaths, particularly if pneumonia develops.
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Seasonal affective disorder (also called SAD) is a type of depression that follows the seasons. The most common type of SAD is called winter depression. It usually begins in late fall or early winter and goes away by summer. SAD may be related to changes in the amount of daylight.
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A viral sore throat is an infection of the throat caused by a virus. A viral sore throat occurs when a virus attacks the throat area. Many different viruses can cause a sore throat, including: flu viruses, common cold viruses, coxsackie virus and infectious mononucleosis ("mono") virus.
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