Negative samples were all nasopharyngeal swabs, but some of the positive samples were taken from tracheobronchial secretions (from intubated patients, far deeper in the airways than a normal swab and absolutely not something you would perform on a non-critically ill patient). It’s possible the dogs aren’t detecting the presence of COVID, but the presence of tracheobronchial secretions. You might quote the article when it says, “There was no notable difference in detection ability between saliva and tracheal secretion.” But it doesn’t give us the raw numbers to decide if there’s a statistically significant difference or not, this is a Nice Blood Inside Me Chrysler Covid-19 2020 I Can’t Stay At Home Halloween Shirt conclusion the authors give without providing the data to support it.
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The COVID positive samples were inactivated with beta propiolactone (BPL) (to protect the dogs from getting sick). We are told that “dogs were provided both negative control samples with and without previous BPL treatment” but we have no idea how this was included in the study. How many negative samples had BPL? Were they presented with the same negative sample that didn’t have BPL? Were they presented at the same time in one of the seven sniffing holes? How many of each sample were there? Does this mean there were additional options for the dog to select from regarding the same negative sample? All things that would bias this Nice Blood Inside Me Chrysler Covid-19 2020 I Can’t Stay At Home Halloween Shirt study quite a bit and we aren’t told the numbers methods on any of it.
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Since ALL the positive samples had BPL and only SOME of the negative samples did, then perhaps the dogs aren’t detecting the presence of COVID, but the presence of BPL. The inactivation process for positive samples with BPL (to keep the dogs safe) involves a number of procedures that the negative samples do not undergo. Rather than detecting the presence of COVID, perhaps the dogs are detecting the presence of samples kept at 4C (in positive samples) vs the negative samples that were not, or perhaps they are detecting the sodium bicarbonate added to the positive samples that were not added to the negative samples. Perhaps the Nice Blood Inside Me Chrysler Covid-19 2020 I Can’t Stay At Home Halloween Shirt dogs are detecting the positive samples for having then been heated to 37C when the negative samples were not.