direct to your inboxInternational travel had the biggest impact on death rates for countries worst hit during the first wave of coronavirus, a study suggests.Researchers from the University of Aberdeen examined a range of factors including border arrivals, population density, the percentage of people living in urban areas, age, average body mass index and smoking prevalence.They found an increase of a million international arrivals was associated with a 3.4 per cent rise in the mean daily increase in Covid-19 deaths during the first wave of the pandemic across the 37 worst-hit countries.Tiberiu Pana, medical student and author of the study, said: “We found that international travel was the strongest predictor of mortality increase.“Our.