South Korea's health authorities on Tuesday reported that COVID-19 variants may account for more than 12-hundred of the country's over 115-thousand coronavirus infections confirmed, so far.
Health authorities regard 914 of these cases to be of the three major coronavirus variants, namely the UK, South Africa, and the Brazil variants.
The rest includes 294 cases of a Californian strain, and nine cases of the Indian strain, with many of these cases detected in people arriving from overseas.
Although investigations are underway to discover the full impact of this double mutant virus from India, it is causing concern, as scientists have identified the Indian variant to have mutations like the ones that evade the best neutralizing antibodies.
It was also reported on Monday that this variant played a part in the death of a 50-year-old South Korean living in India.
Meanwhile, South Korea on Tuesday reported 549 new COVID cases.
The number of infections has dropped a bit from last week, when cases reached over 600 daily.
But concerns over the fourth nationwide spike continue as the nation has yet to see a notable decrease in infections.
529 of Tuesday's cases were local transmissions.
Contact tracing has revealed indoor sports facilities as a hotbed for viral infections.
"From January to April 19, a total of 40 group infections related to indoor sports facilities were reported, with a total of 1,163 confirmed cases."
A computer simulation conducted by health authorities found out that visitors were much more vulnerable to transmission within an indoor sports facility, and could be infected even when standing 2 meters apart.
Kim Yeon-seung, Arirang News