a string indicating the category of the data, possible values are:
"aggregated" : latest number of cases *aggregated* by country,
"ts-confirmed" : time data of confirmed cases,
"ts-deaths" : time series data of fatal cases,
"ts-recovered" : time series data of recovered cases,
"ts-ALL" : all time series data combined,
"ts-confirmed-US" : time series data of confirmed cases for the United States,
"ts-deaths-US" : time series data of fatal cases for the United States,
"ts-dep-confirmed" : time series data of confirmed cases as originally reported (depricated),
"ts-dep-deaths" : time series data of deaths as originally reported (depricated),
"ts-dep-recovered" : time series data of recovered cases as originally reported (depricated),
"ALL": all of the above
"Toronto" : data for the City of Toronto, ON - Canada