Headaches, a sore throat and a runny nose are the most common symptoms associated with the UK's most widely established Covid variant, researchers have said. The data, collected as part of the app-based Zoe Covid symptom study, suggests that the Delta variant first detected in India feels like a "bad cold", according to Tim Spector, a professor of genetic epidemiology at King's College London, who is leading the work. "Covid is … acting differently now, it's more like a bad cold," he said. "People might think they've just got some sort of seasonal cold, and they still go out to parties … we think this is fuelling a lot of the problem. So, what's really important to realise is that since the start of May, we've been looking at the top symptoms in all the app users, and they're not the same as they were. So, the number one symptom is headache … followed by sore throat, runny nose and fever." According to the NHS, the cla...