There are 808 new COVID-19 cases on Monday according to Greek health authorities.
Traces were also identified after checks at the entrance gates of Greece.
Now, the total number of COVID-19 cases amounts to 410,166 (daily change + 0.2%), of which 51.2% are men.
At the same time, there were 24 new deaths.
Since the beginning of the pandemic, there has been a total of 12,301 COVID-19 cases recorded.
95.2% had an underlying disease and/or age 70 years and over.
The intubated amount to 392 (63.4% men), while their median age is 67 years and 86.5% have underlying disease and/or age 70 years and over.
Finally, there was an admission of 129 (daily change -22.29%) new patients with COVID-19 in hospital.
The average seven-day admissions are 159 patients.
The median age of the cases is 43 years, while the median age of the dead is 78 years.
Demosthenes Sarigiannis, Professor of Environmental Engineering at the Aristotle University of Thessaloniki (AUTH), rang the alarm bell to not end vigilance.
In particular, speaking to SKAI about the course of vaccinations, but also the phenomena of relaxation, he noted that the burden will be immediate and expressed concerns, especially in the summer, if people do not adhere to current measures.
As he said, with the phenomena of people hosting major parties, "we make the summer difficult."
The professor noted that the fourth wave of pandemic is expected to appear in November.
He also noted that the estimate for less than 1,000 cases by June 15 will be realised, given that the effects of the illegally held parties will not become apparent immediately.
Finally, he pointed out that there is a case of not noticing the desired drop, stressing that it is "very likely", as the percentage of vaccinations is not so high.
At least 21.5% of the Greek population is fully vaccinated.
This number is expected to reach 25% by the end of the weekend.
READ MORE: Travel entry requirements for Greece updated.