Case Count Reporting in Cambridge

Case Count

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Cambridge Public Health Department (CPHD) data regarding case counts come directly from MDPH and their surveillance system (MAVEN).  We use the language and terminology per the Centers for Disease Control and Prevention (CDC) guidance, and recent guidance categorizes all confirmed or presumptive positive cases as positive.

CPHD understands that case counts may be higher, due to a number of factors:

  1. Testing capabilities have been increased by other area lab organizations and hospitals and not all of the test results are reported to MDPH or CPHD; and
  2. People may be asymptomatic (or have very mild symptoms) and do not realize that they may have COVID-19 and need to be tested; and
  3. Providers may be offering diagnoses based on symptoms and history (rather than testing) and telling patients that they are likely positive and should stay home and self-quarantine for 14 days. (e.g, Someone might call their provider with a few symptoms and indicate that they were with someone from Biogen. In this case, the doctor may assume  positive for COVID-19 and ask the patient to self-isolate at home for two weeks).

This is the process that the CPHD, and all local health departments, is following.

Confirmed COVID-19 Cases in Cambridge

Notes: Total positive cases include total deaths.
*Any count <5 will be suppressed for privacy reasons.

 

Cumulative COVID-19 Cases by Date

The data represented in the below graph (COVID-19 Cases by Date) are dynamic and may change over time.

Since March 20, 2020, 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).

Since March 31, 2020, CPHD has provided 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.

 

New COVID-19 Cases by Date

The data represented in the below graph (COVID-19 New Cases by Date) are dynamic and may change over time.

Since March 20, 2020, the Cambridge Public Health Department (CPHD) has provided data regarding COVID-19 cases based on the date that the Massachusetts Public Health Department (MDPH) reported the case to CPHD (known as report date).

Since March 31, 2020, CPHD has provided 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.

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