Greece's top scientific adviser has warned against complacency over risks lurking from the coronavirus after the country reported its highest single-day increase in infections in weeks, according to Reuters.

Authorities reported 121 new coronavirus cases after a steady rise over the past 10 days. Tuesday's tally was the highest since April 22, bringing the total number of infections in the country to 4,855. There have been 209 deaths recorded in total.

Professor Sotiris Tsiodras, who gave his first public briefing after a more than two-month hiatus, said there had been no pressure on the public health system, but cautioned that the situation without vigilance could get out of hand.

“There must be great vigilance to a possible increase. The situation could quickly get out of hand. It needs vigilance and attention by all,” he said.