Only relevant to SARS-CoV-2 PCR positive patient.
Timing of positive test compared to admission:
This relies on knowing dates and hence only works on the identifiable data
sets,
     
    
    Usage
    derive_nosocomial_covid_status(df, v, ...)
 
     
    
    Arguments
- df
 
the dataframe.
 
- v
 
the value set. usually precomputed by the augment framework the value
set can be explicitly supplied with v = get_value_sets(df)
 
- ...
 
ignored
 
 
    
    
    Details
    Logic is:
Community if PCR result predates admission
 
Probably commuinity if PCR result within 7 days of admission
 
Probably nosocomial if 7-28 days after admission
 
Otherwise is it undefined.