June 26, 2021 Director-General of the World Health Organization (WHO) Tedros Adhanom Ghebreyesus expressed concern on Friday over the COVID-19’s Delta variant, calling it “the most transmissible of the variants identified so far.” — Courtesy file photo GENEVA — Director-General of the World Health Organization (WHO) Tedros Adhanom Ghebreyesus expressed concern on Friday over the COVID-19’s Delta variant, calling it “the most transmissible of the variants identified so far.” “As some countries ease public health and social measures, we are starting to see increases in transmission around the world,” the head of the UN health agency told journalists at a regular briefing.