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.
The QuickVue Influenza A+B Test is an accurate rapid flu test, that assists the doctor in making an accurate diagnosis. 1 How Long Do Flu Symptoms Last? According to the CDC, the flu typically lasts anywhere from a few days up to 2 weeks after it has been contracted. The length of the flu may be longer than 14 days for those in high risk categories for the illness. This may include: children under five, pregnant women, people over 50 years of age, and those living in assisted care or nursing homes.