[Source: Reuters]

Global health officials on Thursday confirmed an infection with a new strain of the mpox virus in Sweden and linked it to a growing outbreak in Africa, the first sign of its spread outside the continent a day after the World Health Organization declared the disease a global public health emergency.

Swedish health officials said at a press conference that the person was infected while in Africa with the clade Ib type of mpox involved in the recent outbreak. The person is receiving treatment.

Dr. Brian Ferguson of the University of Cambridge said the case in a Swedish traveller was concerning but not surprising, given the severity and spread of the outbreak in Africa.

The WHO on Wednesday declared the outbreak in Africa a public health emergency of international concern or PHEIC after cases in the Democratic Republic of Congo spread to nearby countries. A PHEIC is WHO’s highest level of alert.

There have been 27,000 cases and more than 1,100 deaths, mainly among children, in Congo since the current outbreak began in January 2023.

The global vaccine group Gavi told Reuters it has up to $500 million to spend on getting shots to countries affected by the escalating mpox outbreak in Africa.

Both U.S. and Canadian officials have said they have not identified any cases so far.

The CDC recently issued a Health Alert Network update and updated Travel Health Notice to inform U.S. clinicians, travellers, and public health partners about the spread of clade I mpox into countries that have historically not reported cases of mpox

Clade Ib, the strain of the virus behind the current outbreak, is a new variant of clade I that is endemic in the Congo. Clade Ib appears to spread more easily though routine close contact, including sexual contact.

Clade I mpox tends to cause a higher number of severe infections and have a higher mortality rate than clade II mpox, according to U.S. health officials.

In 2022, WHO declared a public health emergency over an outbreak of mpox caused by clade II, which led to more than 95,000 cases across 115 non-endemic countries.