COVID-19 Case Count by Date

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COVID-19 Case Count by Date

The data represented in this graph are dynamic and may change over time.

Since March 20, the Cambridge Public Health Department (CPHD) has provided data regarding COVID-19 case counts based on the date that the Massachusetts Public Health Department (MDPH) reported the case to CPHD (known as report date).

Beginning March 31, 2020, CPHD began providing COVID-19 case counts based on the onset time -- the date of a positive diagnosis -- which is preferable for studying disease patterns over time. Both sets of data provide the same number of total cases. CPHD often receives onset time (positive COVID-19 diagnosis) after the report date. Thus, the graph displaying onset time is recommended as a representation of the case counts per day.

Daily case counts reflect the total number of cases to date, including active and recovered individuals.


NameSocrata field nameColumn name in sgr mountData typeDescription
New Suspect Casesnew_suspect_casesnew_suspect_casesNumberCases indicated by a positive antibody test. This test is also known as a serology test.
Cumulative Total Casescumulative_totalcumulative_totalNumberCumulative total by date, including confirmed, positive, and suspect case types.
New Total Casesnew_total_casesnew_total_casesNumberSum of positive, probable, and suspect cases.
DatedatedateCalendar date
New Probable Casesnew_probable_casesnew_probable_casesNumberCases indicated by a positive antigen test. This test is also known as a rapid test. This category also includes cases diagnosed because of a known contact with a confirmed case and a subsequent clinical diagnosis based on their symptoms.
New Positive Casesnew_positive_casesnew_positive_casesNumberCases diagnosed via positive viral (PCR) test for COVID-19. This test is also known as a molecular test.
Cumulative Confirmed Casescumulative_casescumulative_casesNumberCumulative total cases over time.

Upstream Metadata