APPLICATIONS Horn antennas are widely used as satellite dishes and radio telescopes. Antennas 6 2. PARABOLIC ANTENNAS A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves.
Flu (influenza). Flu is usually infectious a day before symptoms start and remains infectious for about five to six days. Children and people with lowered immune systems may be infectious for a few days longer.
1 Influenza (Flu). 2  Pneumonia is a major complication of the flu (including H1N1, or swine flu) and can be very serious. 3  Influenza-associated pneumonia is particularly risky for the elderly and people with heart disease.4  It can develop about 5 days after flu symptoms start.reatment. If the pneumonia is severe enough for hospitalization, the standard treatment is intravenous antibiotics for 5 - 8 days. In cases of uncomplicated pneumonia, many patients may need only 2 or 3 days of intravenous antibiotics followed by oral therapy.