As climate change allows ticks to expand their range northward, more people are encountering them—triggering an increase in tick-borne diseases, including some that are difficult to diagnose and treat
. Changing climate facilitates their spread, while expanding suburbs provide ideal habitat for white-footed mice—their main disease reservoir—and deer, a key host. That means ticks are infesting new areas where they can encounter more people, sometimes in “crisis proportions,” says Thomas Mather, who directs the University of Rhode Island’sReported cases of Lyme disease show a steady rise during the last 15 years.
“The general public needs to understand that tickborne diseases in the United States have reached epidemic proportions and are a significant threat to public health,” says Daniel Sonenshine, a tick expert and guest researcher at the National Institute of Allergy and Infectious Diseases.Maria Diuk-Wasser is an epidemiologist and ecology professor at Columbia University who is working on the front lines of tick research.
Peering at her quarry, I can see why nymphs are likened to poppy seeds. This young tick is a miniscule black dot, and it terrified me. It’s so tiny I can’t imagine ever finding it if it latched on to feed.That’s exactly why spring and early summer are the most dangerous times of year, Diuk-Wasser says: When last years’ larvae emerge as nymphs, they start searching for hosts, and they can transmit pathogens to humans.
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