The illness, California's first, prompted stepped-up surveillance and efforts to raise awareness.
Europe had the biggest mpox rise in September, though the Western Pacific region continues to report the highest levels.
Favorable conditions for mosquitos and humanitarian challenges contribute to the high transmission risk in Chad.
Kids younger than 5 are at risk for severe dengue symptoms, including dehydration and shock.
The group urged countries approaching their summer seasons to prepare their health systems for a rise in dengue cases.
As Bangladesh's dengue outbreak spreads outside the capital, Nigeria battles another diphtheria wave and Uruguay reports its first H5 detection in a sea lion.
With a new case in Miami-Dade County, Florida now has 16 dengue infections for the year.
New York City dermatologists have noted severe fungal infections, and Argentina reports H5 avian flu in sea lions.
The WHO guidance replaces temporary recommendations, Florida has 15 dengue cases now, and Connecticut confirms 4 people infected with the tick-borne Powassan virus.
County officials have issued a mosquito-borne illness alert following the detection of 2 local dengue cases.
