Our daily lives during the Covid-19 pandemic have been dominated by hygiene, hygiene and more hygiene. After over two years of battling the novel coronavirus, we’re still wearing a face mask much of the time, bumping fists or elbows instead of shaking hands, and diligently disinfecting surfaces. But infection rates are falling in many places, bringing down compulsory masking in retail shops and raising hope that the pandemic is nearing mere endemic status. So do we drop the hygiene routines we’ve become accustomed to? “Not at all,” says hygiene specialist Dr Klaus-Dieter Zastrow. Dr Clemens We…