This is a new ‘novel’ form of coronavirus. I have read it possibly originated in swine… or possibly snakes… in the Wuhan area. This coronavirus attacks lung cells, resulting in a viral pneumonia. The ‘pneumonia shots’ we get as seniors (13-valent and 23-valent) are for known bacterial strains of pneumonia and are not effective against coronavirus.
At this point there is no vaccine, and nothing but support care for infected individuals. The immune system has to handle this one. Immune compromised patients will be the worst hit.
Isolation, boosting your immune system, and antiviral remedies to prevent infection are your best bet. I have used MMS (Chlorine Dioxide) to successfully treat the onset of influenza virus, and would do the same if I suspected coronavirus infection. I don’t know that colloidal silver would be effective against a viral infection, but it would help prevent secondary bacterial infections if mist inhaled to the lungs.