Following a series of consultations with global experts, WHO will begin using a new preferred term “mpox” as a synonym for monkeypox. Both names will be used simultaneously for one year while “monkeypox” is phased out.
When the outbreak of monkeypox expanded earlier this year, racist and stigmatizing language online, in other settings and in some communities was observed and reported to WHO. In several meetings, public and private, a number of individuals and countries
raised concerns and asked WHO to propose a way forward to change the name.
Assigning names to new and, very exceptionally, to existing diseases is the responsibility of WHO under the International Classification of Diseases (ICD) and the WHO Family of International Health Related Classifications through a consultative process
which includes WHO Member States.
WHO, in accordance with the ICD update process, held consultations to gather views from a range of experts, as well as countries and the general public, who were invited to submit suggestions for new names. Based on these consultations, and further discussions
with WHO’s Director-General Dr Tedros Adhanom Ghebreyesus, WHO recommends the following:
- Adoption of the new synonym mpox in English for the disease.
- Mpox will become a preferred term, replacing monkeypox, after a transition period of one year. This serves to mitigate the concerns raised by experts about confusion caused by a name change in the midst of a global outbreak. It also gives time to
complete the ICD update process and to update WHO publications.
- The synonym mpox will be included in the ICD-10 online in the coming days. It will be a part of the official 2023 release of ICD-11, which is the current global standard for health data, clinical documentation and statistical aggregation.
- The term “monkeypox” will remain a searchable term in ICD, to match historic information.
Considerations for the recommendations included rationale, scientific appropriateness, extent of current usage, pronounceability, usability in different languages, absence of geographical or zoological references, and the ease of retrieval of historical
Usually, the ICD updating process can take up to several years. In this case, the process was accelerated, though following the standard steps.
Various advisory bodies were heard during the consultation process, including experts from the medical and scientific and classification and statistics advisory committees which constituted of representatives from government authorities of 45 different
The issue of the use of the new name in different languages was extensively discussed. The preferred term mpox can be used in other languages. If additional naming issues arise, these will be addressed via the same mechanism. Translations are usually
discussed in formal collaboration with relevant government authorities and the related scientific societies.
WHO will adopt the term mpox in its communications, and encourages others to follow these recommendations, to minimize any ongoing negative impact of the current name and from adoption of the new name.
Note to editors
Background information on naming of the disease, the virus that causes the disease, and the virus variants or clades:
Naming the disease:
- Human monkeypox was given its name in 1970 (after the virus that causes the disease was discovered in captive monkeys in 1958), before the publication of WHO best practices in naming diseases, published in 2015. According to these best practices, new disease names should be given with the aim to minimize unnecessary negative impact of names on trade, travel, tourism
or animal welfare, and avoid causing offence to any cultural, social, national, regional, professional or ethnic groups.
- Assigning new names to new and, very exceptionally, to existing diseases is the responsibility of WHO under the International Classification of Diseases and the WHO Family of International Health Related Classifications (WHO-FIC) through a consultative process which includes WHO Member States. ICD is part of the WHO Family of
International Health Related Classifications (WHO-FIC).
Naming of viruses:
The naming of viruses is the responsibility of the International Committee on the Taxonomy of Viruses (ICTV). Prior to the 2022 global
monkeypox outbreak, there was already a process underway to reconsider the naming of all orthopoxvirus species, including monkeypox virus. This will continue under ICTV leadership.
Naming monkeypox virus variants or clades:
In August, a group of global experts convened by WHO agreed on new names for monkeypox virus variants, as part of ongoing efforts to align the names of the monkeypox disease, virus and variants
– or clades – with current best practices. Consensus was reached to refer to the former Congo Basin (Central African) clade as Clade one (I) and the former West African clade as Clade two (II). Additionally, it was agreed that the Clade
II consists of two subclades, IIa and IIb. See WHO press release on naming of monkeypox clades.