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I don't agree that people shouldn't quarantine if they lose their sense of smell/taste.
In the absence of widespread testing any decision to self-isolate is made with the knowledge that it may well not be COVID-19, but it could be.
OK, this study is based on self-reporting. But as 59% who said they were COVID-19 positive reported loss of smell and taste, and these results were much stronger in predicting a positive COVID-19 diagnosis than self-reported fever, the only sensible thing to do if you do have anosmia/hyposmia is to self-isolate, surely?
They were sent out yesterday under embargo which is why I couldn't post them:
https://www.bbc.co.uk/news/health-52111606