Scientists studying the new mpox strain spread out of the Democratic Republic of Congo say the virus is changing faster than expected, often in areas where experts lack the funding and equipment to track it properly.
That means there are numerous unknowns about the virus itself, its severity, and how it is transmitting, complicating the response, half a dozen scientists in Africa, Europe, and the United States told.
A new strain of the virus, known as clade Ib, has the world’s attention again after the WHO declared a new health emergency.
The strain is a mutated version of clade I, a form of mpox spread by contact with infected animals that have been endemic in Congo for decades. Mpox typically causes flu-like symptoms and pus-filled lesions and can kill.
Congo has had more than 18,000 suspected Clade I and Clade Ib mpox cases and 615 deaths this year, according to the WHO.
There have also been 222 confirmed clade Ib cases in four African countries in the last month, plus a case each in Sweden and Thailand in people with a travel history in Africa.
Mpox, formerly known as monkeypox, has been a public health problem in parts of Africa since 1970 but received little global attention until it surged internationally in 2022, prompting the World Health Organization to declare a global health emergency.
