The CDC considers this new virus a public health concern based on current information. However, the immediate health risk to the general US public is considered low at this time. The CDC and the World Health Organization are closely monitoring the situation and providing ongoing guidance.
Symptoms and transmission:

Symptoms may be flu-like, ranging from mild to serious, and include:

Fever
Cough
Difficulty breathing.

Person-to-person spread is occurring, although it’s unclear exactly how it is transmitted and how easily the virus spreads between people.

Treatment:

People infected with 2019-nCoV should receive supportive care to help relieve symptoms. Currently, there is no specific antiviral treatment recommended for 2019-nCoV infection. (source: CDC)

Prevention:

There is no vaccine to prevent this virus, and the CDC advises that the best way to prevent infection is to avoid being exposed to this virus.
Here are everyday actions to help prevent the spread of respiratory viruses:

Wash your hands often with soap and water for at least 20 seconds. If soap and water are not available, use an alcohol-based hand sanitizer that contains at least 60% alcohol.
Avoid touching your eyes, nose, and mouth with unwashed hands.
Avoid close contact with people who are sick.
Practice social distancing (6 feet).
Wear a mask in public settings and when around people outside of your household, especially when social distancing
Stay home when you are sick.
Cover your cough or sneeze with a tissue, then throw the tissue in the trash.
Clean and disinfect frequently touched objects and surfaces.