elbows
Well-Known Member
OK one last attempt for now.
The chart I posted earlier is NOT the same as the charts we looked at in the past, which provided a vaguer sense of what people had been doing prior to infection. They are all part of the same attempts to survey the situation, but there are important differences.
Here are examples of the other sorts of charts from November, behind a spoiler tag to stop this post being too long, which are of the variety we argued about in the past.
In regards the chart I did post earlier, and my complaint about their failure to describe it properly, I have found more useful descriptions of what is shown from an earlier November version, probably the same one that lead to those press reports. Hopefully something in these words will make clearer what this data actually is. But please note that they have tightened the definitions for which cases can be included in this data since then, and that is somewhat explained in the blurb under the most recent version of the graph I posted earlier today. Also note that the number of cases involved in the chart I posted earlier were low, especially compared to the numbers in the November version of that data.
All are from this file from November https://assets.publishing.service.g...-19_and_Influenza_Surveillance_Graphs_w47.pdf
The chart I posted earlier is NOT the same as the charts we looked at in the past, which provided a vaguer sense of what people had been doing prior to infection. They are all part of the same attempts to survey the situation, but there are important differences.
Here are examples of the other sorts of charts from November, behind a spoiler tag to stop this post being too long, which are of the variety we argued about in the past.
In regards the chart I did post earlier, and my complaint about their failure to describe it properly, I have found more useful descriptions of what is shown from an earlier November version, probably the same one that lead to those press reports. Hopefully something in these words will make clearer what this data actually is. But please note that they have tightened the definitions for which cases can be included in this data since then, and that is somewhat explained in the blurb under the most recent version of the graph I posted earlier today. Also note that the number of cases involved in the chart I posted earlier were low, especially compared to the numbers in the November version of that data.
Of the 128808 cases reported for contact tracing between 09 November to 15 November 2020, 34,328 (26.7%) had a common exposure with at least 1 other case. 9789 common locations/settings were reported in total (of which the table calculates % of the most frequent). Supermarkets (visiting and working) were the most frequent common exposure setting followed by attending secondary school.
Common Exposure Reports use NHS Test and Trace enhanced contact tracing data to identify locations or activities reported by 2 or more cases. Once a case enters the NHS Test and Trace system, enhanced contact tracing information is collected on household, workplace, education and activities in the 7-2 day period before symptom onset (or date of test if onset date is not provided). Data collected for this period is primarily used to identify where someone may have caught their infection.
Data presented are for common exposures within the enhanced contact tracing data with a known postcode only. Activities, household and workplace events reported by cases are grouped based on a shared postcode. Any event with >=2 cases associated with it (>=2 persons declaring the same postcode with onsets (or date tested if unavailable) the last 7 days) is defined as a common exposure and is included in this report.
Locations with more visitors are more likely to be identified as common exposures. No adjustment has been made for how commonly a location is visited. The exposure category selected is the most commonly identified among all individuals with an event at that postcode. The exposure category can change retrospectivity therefore, changing the most common exposure as reported here.
Common exposures identified in this way are not always indicative of epidemiological linkage between the cases and require further investigation. Some will be coincidental rather than relating to potential/actual transmission events.
All are from this file from November https://assets.publishing.service.g...-19_and_Influenza_Surveillance_Graphs_w47.pdf