South Korea reported six-hundred 72 new cases on Saturday, the fourth day in a row it's been in the six hundreds.
The figure is still high, considering that fewer tests are conducted on weekends.
Over 60 percent of the cases were in the greater Seoul area, but new infections were reported across the country, including the southern port city of Busan and the central city of Daejeon.
In recent weeks, there's been a growing number of cases in which the route of infection is unknown.
In fact, over the past two weeks, the routes have been unclear for three out of every ten new infections.
Health experts are concerned that the virus is spreading as people go about their daily lives, and warn this could mean that daily case numbers will rise, especially through unknown routes.
Warning that the fourth wave of the pandemic could come at any time, the country's acting prime minister stressed the importance of a swift and speedy vaccination rollout.
"Vaccines are the essential method for us to achieve herd immunity by November. And with that in mind, it's crucial that we speed up our vaccination drive."
To do that, South Korea will start giving the AstraZeneca vaccine to healthcare workers and airline crews starting Monday.
Those eligible will get their shots at designated local clinics, but they will not be given to people under age 30 because of concerns over rare blood clots.
Around 29-thousand people were vaccinated on Saturday, raising the total number of people who've gotten at least one dose to over one-and-a-half million.
There were also 78 new cases of side effects, including one case of anaphylaxis.
The others had mild symptoms like headaches and muscle aches.
Kim Dami, Arirang News.