Increasing Length of the Babesia Season in New England in the Climate Change Era - Takeaways - MDSpire
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Expansion of Babesia Season Duration in New England Amid Climate Change

  • By

  • John J Ross

  • Narath Carlile

  • Kevin L Ard

  • August 1, 2025

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  • 1

    The Babesia season in New England has expanded significantly, increasing by 0.33 months per year over the past 31 years.

  • 2

    The mean duration of symptomatic babesiosis cases rose from 2.2 months before 2000 to 9.2 months after 2015.

  • 3

    Incidence rates of babesiosis surged dramatically in New England, with increases of up to 1602% in states like Vermont between 2011 and 2019.

  • 4

    Climate change has contributed to longer tick seasons, enhancing the survival and activity of the blacklegged tick, the primary vector for Babesia.

  • 5

    Babesiosis should be considered in differential diagnoses for fever and anemia year-round, not just during peak summer months.

Original Source(s)

Increasing Length of the Babesia Season in New England in the Climate Change Era

  • by John J Ross, Narath Carlile, Kevin L Ard

  • August 1, 2025

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