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COVID-19 positivity metrics not updated

Due to a data processing issue, COVID-19 positivity metrics have not been updated this week, and will be updated in upcoming refreshes.

BackEntry title:

COVID-19 headline cases 7 day change

Last updated on Wednesday, 20 December 2023 at 04:15pm

Summary

Topic
COVID-19
Category
headline
API name
COVID-19_headline_cases_7DayChange

Rationale

The timely identification of cases is important to controlling the spread of COVID-19 and reducing the burden on healthcare systems.

Definition

This metric shows the difference in the number of reported new cases in the last 7 days compared to the previous 7 days.

New cases are reported by specimen date - the date the first sample that identified the infection was taken from an individual.

Methodology

COVID-19 cases are identified by taking specimens from people and testing them for the SARS-CoV-2 virus. If the test is positive, this is a case. Some positive rapid lateral flow test results are confirmed with lab-based polymerase chain reaction (PCR) tests taken within 72 hours. If the PCR test results are negative, these are not reported as confirmed cases.

People who test positive again after a given time period are counted as new cases. In England people are counted as new cases if they test positive again more than 90 days after their last positive test.

Data for the last 5 days by specimen date are considered incomplete as it takes time to get test results and record them on relevant lab systems. Cases data for England includes all positive lab-confirmed PCR test results plus, positive rapid lateral flow tests unless followed by a negative PCR test taken within 72 hours.

The change in reported new cases is calculated as the difference between the total of the daily cases counts in the 7 days up to and including the most recent date with "complete" data (i.e. 5 days before the current date) and the total of the daily cases counts in the previous 7 days.

Caveats

This figure will underestimate the actual number of COVID-19 infections due to people not testing or not being able to report LFD results.

The change includes newly-reported cases, and adjustments to previously-reported cases – these may go up or down.

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