PJ.2.1 Covid variant: Highly mutated strain found in US, Europe, Australia, Asia

A new Covid-19 variant, PJ.2.1, has been detected in multiple countries, including the US, Europe, Australia, and Asia, prompting global assessment of its pandemic potential. First identified in Ontario, Canada, in May 2026, it is a highly mutated "saltation variant" descended from the JN.1 lineage. The variant carries a highly mutated spike protein with an increased ability to bind to the ACE2 receptor, making it more efficient at infecting cells. However, scientists say it is not significantly better at evading immune protection, as antibodies from recent vaccines still recognize and neutralize it fairly well. Currently, there is no established symptom profile for PJ.2.1, and evidence is insufficient to determine if it raises hospitalization or death risks. Researchers advise people with common Covid-19 symptoms like fever, sore throat, or fatigue to get tested.