More evidence is emerging that the Omicron coronavirus variant is affecting the upper respiratory tract, causing milder symptoms than previous variants and resulting in a "decoupling" in some places between soaring case numbers and low death rates, a World Health Organization official said on Tuesday.

"We are seeing more and more studies pointing out that Omicron is infecting the upper part of the body. Unlike other ones, the lungs that would be causing severe pneumonia," WHO incident manager Abdi Mahamud told Geneva-based journalists...