Greek Prime Minister Kyriakos Mitsotakis has visited earthquake-struck Santorini, as the Aegean island imposed more precautionary measures amid intense seismic activity.
Santorini, and other Greek islands in the region, are in the middle of an "unprecedented" seismic swarm or crisis - the name for an abrupt increase in earthquakes in a particular area.
Experts said it raises new questions about wider spread and the difficulty of controlling infections in animals and the people who work closely with them.