This article will be updated as I come across more news.
The following about the death rate in Monkeypox is from an article of 20 May 2022 in the journal Nature, that is mentioned in an article in Quartz about the development of vaccines for Monkeypox.
What researchers can tell from this preliminary genetic data is that the strain of the monkeypox virus found in Portugal is related to a viral strain predominantly found in West Africa. This strain causes milder disease and has a lower death rate about 1% in poor rural populations compared with the one that circulates in Central Africa. But exactly how much the strain causing the current outbreaks differs from the one in West Africa and whether the cases popping up in various countries are linked to one another remains unknown.