In some cases, however, doctors will want a more precise diagnosis, which helps inform public health officials about outbreaks. A flu test is also sometimes given to people at risk of becoming very sick, such as hospitalized patients, infants and those with underlying health conditions. Health care workers may also receive a flu test.

In general, it’s not necessary for you to know whether your flu is H1N1 or a seasonal strain. They are treated similarly and have similar effects, although this H1N1 strain seems to be transmitted especially easily among children and young adults.

Q&A sample from: http://www.inforum.com

Answer
from James M. Steckelberg, M.D.

The length of time that cold or flu germs can survive outside the body on an environmental surface, such as a doorknob, varies greatly. But the suspected range is from a few seconds to 48 hours — depending on the specific virus and the type of surface.

Flu viruses tend to live longer on surfaces than cold viruses do. Also, it’s generally believed that cold and flu viruses live longer on nonporous surfaces — such as plastic, metal or wood — than they do on porous surfaces — such as fabrics, skin or paper.

Although cold and flu viruses primarily spread from person-to-person contact, you can also become infected from contact with contaminated surfaces. The best way to avoid becoming infected with a cold or flu is to wash your hands frequently with soap and water or with an alcohol-based sanitizer.