Update README.md

CSSEGISandData · Apr 28, 2020 · a35c72f · a35c72f
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@@ -23,11 +23,14 @@ MM-DD-YYYY.csv in UTC.
 * <b>Country_Region</b>: Country, region or sovereignty name. The names of locations included on the Website correspond with the official designations used by the U.S. Department of State.
 * <b>Last Update</b>: MM/DD/YYYY HH:mm:ss  (24 hour format, in UTC).
 * <b>Lat</b> and <b>Long_</b>: Dot locations on the dashboard. All points (except for Australia) shown on the map are based on geographic centroids, and are not representative of a specific address, building or any location at a spatial scale finer than a province/state. Australian dots are located at the centroid of the largest city in each state.
-* <b>Confirmed</b>: Confirmed cases include presumptive positive cases.
+* <b>Confirmed</b>: Confirmed cases include presumptive positive cases  and probable cases, in accordance with CDC guidelines as of April 14.
 * <b>Deaths</b>: Death totals in the US include confirmed and probable, in accordance with [CDC](https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/cases-in-us.html) guidelines as of April 14.
 * <b>Recovered</b>: Recovered cases outside China are estimates based on local media reports, and state and local reporting when available, and therefore may be substantially lower than the true number.
 * <b>Active:</b> Active cases = total confirmed - total recovered - total deaths.
-* <b>Combined_Key</b>: Admin2 + Province_State + Country_Region.
+* <b>Incidence_Rate</b>: Admin2 + Province_State + Country_Region.
+* <b>Case-Fatality Ratio (%)</b>: = confirmed cases per 100,000 persons.
+* <b>US Testing Rate</b>: = total test conducted per 100,000 persons. 
+* <b>US Hospitalization Rate (%)</b>: = Total number hospitalized / Number confirmed cases. The "Total number hospitalized" is the "Hospitalized – Cumulative" variable from Covid Tracking Project. The "hospitalization rate" and "hospitalized - Cumulative" data is only presented for those states which provide cumulative hospital data.
 
 ### Update frequency
 * Files on and after April 23, once per day between 03:30 and 04:00 UTC.