The caseload of such infections reached 8,125 here, with the
number of delta cases first reported in India tallied at 4,912, according to
the Korea Disease Control and Prevention Agency (KDCA).
Health authorities said the country will witness more cases
of the variants down the road.
The rate of variant cases detected through gene analysis
came to 67.6 percent over the past week, sharply up from 54.8 percent a week
earlier, the KDCA said.
Earlier in the day, the KDCA said the country confirmed two
cases of the highly transmissible delta plus variant of the novel coronavirus.
It marks the first time the country has reported cases of
the delta plus version, considered a sublineage of the delta variant, the KDCA
said.
The KDCA said one of the delta plus cases is a man in his
40s who has never been overseas.
The delta variant of the novel coronavirus was first
detected in India last October. The "subvariant" strain is considered
to be even more contagious, possibly capable of infecting people even after
inoculation.
The only known difference with the delta variant is an
additional mutation called K417N -- a spike protein that allows infection of
healthy cells.
The "subvariant" strain has been identified in
over 20 countries, indicating that more study is needed to understand the
extent of the transmission, the authorities said.
The steady rise in variant cases poses a threat to the
country's virus battle currently dogged by a spike in new cases and the
slowdown of its inoculation campaign.
On Tuesday, the country reported 1,202 new COVID-19 cases,
staying in the 1,200s for the second day in a row, due to fewer tests.
Slightly over 20 million people have been inoculated as of
Tuesday since the country started its nationwide vaccination program in late
February.
To block the inflow of the new emerging strain from India,
entrants from the country are mandatorily quarantined at state facilities for
seven days before being put under self-quarantine, depending on the results of
virus tests.