Breath samples from two patients were positive for coronavirus RNA, but surface swabs of their cell phones, hands, and toilets were negative. Viral RNA was also detected on an air ventilation duct below another patient's bed."

Protection:
How to Protect Yourself | CDC:
Cloth Face Coverings,
How NOT to Wear a Mask - The New York Times

• Cleaning:
  

  • Clean frequently used items whenever you go out to public places (Grocery store, pharmacy):
    Cell phone, handles and knobs in your car, keys, door knobs.
  • Wear gloves whenever possible
  • A few times per week: wipe down all railings, doorknobs, remote controls, desk, computer mouse and keyboard, light switches, microwave, refrigerator door handle, toaster oven, coffee pot controls, etc.
  Coronavirus: Sanitizing, According To Science Mar 13, 2020
  

  Viral Dose is important:
  viruses are usually more dangerous in larger amounts. Small initial exposures tend to lead to mild or asymptomatic infections, while larger doses can be lethal.

  In-person interactions are more dangerous in enclosed spaces and at short distances, with dose escalating with exposure time. Touching our faces after getting substantial amounts of virus on our hands. | These Coronavirus Exposures Might Be the Most Dangerous | NY Times

  Symptoms:
  Coronavirus Symptoms Examples - Worldometer

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  Recovery:
  How 'smell training' could help overcome post-viral smell distortions -- ScienceDaily

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  More Links:
  Transmission of SARS-CoV-2: implications for infection prevention precautions WHO July
  Novel coronavirus mistakes and myths | UC Davis Health Sept 2
  Personal protective equipment
  What We Need to Understand About Asymptomatic Carriers if We’re Going to Beat Coronavirus