Modeling study shows potential growth of outbreak ![]() The authors also said the 50 SNPs that diverge from the original strain are far more (roughly sixfold to 12-fold more) than one would expect considering previous estimates of the substitution rate for orthopoxviruses, which typically have 1 to 2 substitutions per site per year. Instead, "Current data points for a scenario of more than one introduction from a single origin, with superspreader event(s) (e.g., saunas used for sexual encounters) and travel abroad likely triggering the rapid worldwide dissemination." The authors said the outbreak was likely not caused by undetected silent spread, or from an animal-to-human crossover event. Monkeypox outbreaks from clade 3 are typically reported from western Cameroon to Sierra Leone and usually carry a less than 1% case-fatality rate. The strain belongs to clade 3 of the West African strain of the virus, which is less fatal than the Congo Basin clade. Researchers found the current strain diverges from the original strain by 50 single nucleotide polymorphisms (SNPs), and several mutations made the virus more transmissible. The study comes from Portugal's National Institute of Health in Lisbon, which was the first institution to genetically sequence the current strain behind more than 3,000 cases of monkeypox in Europe, North America, and other regions that had never seen the virus until this year. ![]() The strain of the virus in the current monkeypox outbreak in nonendemic countries likely diverged from the monkeypox virus that caused a 2018-19 Nigerian outbreak and has far more mutations than would be expected, several that increase transmission, according to a study today in Nature Medicine.
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