Jung Eun-kyeong, the director of South Korea’s Centers for Disease Control and Prevention, believes that it is likely the country will see a second wave of the novel coronavirus pandemic.

“Unless herd immunity is achieved through natural spread or through vaccines, come autumn or winter season, because most of the people do not have immunity, there is a likely possibility,” Jung said.

South Korea’s response to the pandemic has been hailed as one of the world’s best, in large part due to a massive push by health officials to conduct widespread testing.

At least 10,694 people have contracted the virus in the country, killing 238, according to a tally by Johns Hopkins University.

Jung also revealed the preliminary results of a study on retesting positive cases. In the six tests completed so far, the virus did not separate during the cultivation study.

“We understand that the contagiousness is either zero or very low,” Jung said.