But is it safe to go abroad? The introduction of a traffic light system and easing of travel restrictions could be read as a big thumbs up to pack that suitcase of yours, but experts in viral transmission are a little more cautious. “I don’t consider mass international travel to be desirable at the current time,” Professor Eleanor Riley, an immunologist and expert in infectious disease at the University of Edinburgh, tells HuffPost UK. If you’re fully vaccinated by summer, overseas travel should not be a particular health risk, she acknowledges, but there are still some unknowns. For example, until we know more about how likely vaccinated people are to be a source of infection for others and to contribute to the spread of the virus and its variants of concern, those who have been jabbed could still pose a risk to others.