Are they serious?!
Surge in Leicester cases due to a massive uptake of people there enthusiastically gagging over home tests?
Ah well, never mind then.
Well, I dont think I can judge. It depends on how 'partly' they think it may be a factor.
And I am still missing important bits of info that would help me judge. Such as the number of tests in each of these locations, not just the number of positives. Because looking at the percentage positive can help compensate for changes over time that are caused by changes to the testing regime rather than the viral reality.
And ideally both us and the authorities should always be combining positive test data with other data such as a variety of indicators from hospitals, so that number of positive tests alone is not the only indicator that can trigger draconian measures. Hancock has mentioned a couple of hospital-related numbers in relation to Leicester so that is one sign of this happening, but I dont know how sophisticated their analysis has been. And I've gone on in the past about local sewage analysis being another very useful sounding indicator, because that avoids the lag that comes with hospital data and wont be skewed by variations in who is getting tested and in what numbers. But I cannot claim to know whether such sewage analysis systems are actually up and running in this country, how local the data is, how timely it is and who is looking at it.
Other questions raised by these uncertainties over the reality in Leicester vs elsewhere are to do with the perils of attempting a bunch of different kinds of contact and local outbreak contact tracing and epidemiological investigations at 'the wrong time/stage of the pandemic' or with too much uncertainty about how to interpret the results. I think I might need to explain this point better anotehr time, but it includes the possibility that so far the authorities have still been mostly used to only spotting the tip of the iceberg, and wont be sure how strongly to react when something approaching the full iceberg starts being spotted from time to time in places where they actually end up looking.
As well as learning how many tests have actually been carried out within the recent time period in all the locations around the country, it would also be helpful to understand what different factors have driven the levels of testing in different places, how much variation in attention different locations have received by the authorities etc. Because its not hard to imagine a scenario where a particular local incident at a specific location receives the attention of the authorities, and in the course of this work they end up spotting a whole level of transmission that is actually going on in plenty of other places too, but hasnt received the attention or been formally measured.
My own observations using data have been limited mostly to hospital & death data until just the last few days, and from that angle Leicester actually stuck out more for a prolonged period earlier on in this pandemic, eg when it came to deaths in hospital and the way the numbers were declining slowly in Leicester, May was more notable than June. I wonder if thats what drew attention and then test capacity/accessible popup test sites to Leicester in the first place, and then because they were actually looking they found plenty of milder cases in this younger cohort that keeps getting mentioned in connection with Leicester. I know I went on about 'seek and you shall find' at the earlier phase of the pandemic where we 'didnt have any deaths because we werent looking for any, and then we looked and soon found some', but I suspect there are other versions of 'seek and you shall find' too. Ones that can happen in these later phases and offer a repeat performance of demonstrating things to the authorities that they should already have known. And in many cases probably did already know/assume/suspect to be the case, but then managed to overlook these assumptions when it came to other aspects of their response/surveillance/triggers.
Anyway I cannot make a solid claim either way, I cannot say that Leceister does not deserve the attention and measures that have been directed at it. Maybe it does and maybe it doesnt. I can say that I feel the picture is too patchy for me to be confident either way.
I suppose there is another simple thing we could do to put the positive tests per 100,000 figure theyve got for Leicester into context. I'm too tired to go looking right now, but I believe there are at least one or two weekly or semi-regular uk numbers published where they estimate/model how many cases they think there were in the uk per week. That number would be expected to be higher than the typical figures they have directly obtained from testing, because its always acknowledged that testing does not come anywhere close to detecting every case, not even vaguely close. So maybe we should compare those modelled numbers to the Leicester number. Then ask ourselves whether authorities should react the way they have with Leicester if the Leicester number is higher than testing has shown elsewhere, but not alarmingly higher than the estimated/modelled sense of where the country is at with its levels of infection right now. Depending on what that number is this paragraph may be making a useless point though, I dont have the number in mind right this second, maybe I will go and look now.
The bit about PHE not having tracked things down to a single massively contributing outbreak setting is not really surprising, this was expected. Because if they were confident that what had been found was loads of cases mostly clustered around a single setting with just a bit of broader leakage, they would have used the very narrow whack-a-mole technique they've used elsewhere before now, rather than feeling the need to take the response to this much broader level. But again whether this has actually been a sensible approach depends really on whether Leiester is the exception or just the first place they've actually looked hard enough to get a truer sense of the picture. And questions on this front can interact with questions about whether we've moved to the right phase of unlocking for the phase of infection levels we actually have in this country right now.