California Reports First Known Case of More Severe Mpox Strain in U.S.

The United States has confirmed its first known case of a more severe strain of mpox (formerly known as monkeypox), specifically the clade I variant, according to the Centers for Disease Control and Prevention (CDC). This case, diagnosed in California, involved an individual who had recently traveled to Eastern Africa, where an mpox outbreak is ongoing. Although clade I is typically associated with more severe disease, the CDC noted that the risk to the public remains low.

The patient was treated at a local medical facility and has since been released, continuing to recover in isolation at home. The CDC and state health officials are working to track and follow up with potential contacts. The mpox clade I strain is responsible for the recent rise in cases in Africa, with the clade Ib subtype causing a significant portion of the ongoing outbreaks.

While clade I has historically been linked to more severe illness and higher death rates (ranging from 3%-11%), recent data shows that, with proper medical care, the death rate in current outbreaks has significantly decreased, with mortality rates as low as 1% in well-resourced healthcare settings like those in the United States. The CDC emphasized that the mpox risk to the general public in the U.S. remains low, and no deaths have been reported in the current international cases of clade I mpox.

Globally, mpox cases have been rising, particularly in Africa, with significant outbreaks in countries like Democratic Republic of Congo, Uganda, and Burundi. The World Health Organization (WHO) is planning to hold an emergency committee meeting on November 22 to discuss whether the outbreak still constitutes a public health emergency of international concern.

The CDC recommends that individuals protect themselves by avoiding contact with people showing symptoms of mpox and contaminated materials, and by getting vaccinated if eligible. The initial symptoms of mpox are flu-like, followed by a rash with raised lesions that scab over. Vaccination involves a two-dose regimen.

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