In South Korea, over 96 percent of those who tested positive with COVID-19 in May and June were unvaccinated.
The country is in the process of administering vaccines but the deals to buy more doses next year could be affected as drugmakers Pfizer and Moderna have decided to raise their prices.
Although, this will not affect the price of this year's supply.
According to the UK's Financial Times, both Pfizer and Moderna have upped the prices 25 and 13 percent respectively of their mRNA coronavirus vaccines in the latest supply contracts submitted to the European Union.
In the meantime, scientists from the UK have advised that the vaccines' protection rate is likely to decline and that the vaccination campaign will continue for years.
The document submitted to British government's advisory group adds that at the moment, they don't know when would be the right time for re-vaccination.
Israel on Sunday began giving a third shot of the Pfizer vaccine to people over 60 to curb the spread of the Delta variant.
Israel is the first country to offer a booster shot and comes following a rise in the cases in the past month, despite over half of the population being fully vaccinated.
"We're adding the third vaccination due to the decline in the level of vaccination we've seen with 60-year-olds and above."
And other countries like the UK are planning on giving booster shots to the over-50s.
The U.S. is also considering a third shot.
Jang Tae-hyun, Arirang News.