One of the most visible effects of the COVID-19 pandemic this year is the growing number of empty supermarket shelves. And unlike the shortages back in 2020 - which involved items like toilet paper - its not simply the result of panic buying. This time its a symptom of a growing crisis in the countrys supply chains. Governments are responding by easing COVID isolation rules - but working out the details is complicated, as Peter McCutcheon reports.
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