On the 18th (KST), the World Health Organization (WHO) predicted that the delta variant virus (India mutation virus), known to be more contagious than the alpha variant virus (UK mutation virus), will become the dominant species among the global COVID-19 variants. With an analysis that the delta variant is about 60% more contagious than the alpha variant, a study claims that if infected with the delta virus, there is a possibility that symptoms different than those of the existing corona patients will appear or there will be fewer asymptomatic patients. Delta variant spreads to more than 80 countries... Although the domestic spread rate is low, concerns are growing On the 18th, WHO announced that "Delta variant is becoming the dominant species worldwide due to their fast transmission and the progress has already progressed considerably." The delta variant is known to be more transmissible not only than the existing COVID-19 virus, but also 60% more transmissible than the alp...