Summer in the U.S. is now in full swing. That means plenty of outdoor fun, Sun, and, unfortunately, for many of us, tiny eight-legged ticks to avoid.
Ticks and the many illnesses they carry, like Lyme disease, are a growing public health threat. Just this week, for instance, the latest data from the Centers for Disease Control and Prevention showed that 2025 so far has seen the highest number of tick-related emergency room visits recorded since 2019. And though the worst tick species are especially common in the Northeast, disease-carrying populations are steadily spreading further across the U.S. What’s more, scientists are still continuing to discover new viruses and bacteria spread by ticks that can potentially sicken people.
“Overall, tickborne diseases are absolutely becoming more common.”
With Americans firmly in the middle of hot tick summer, Gizmodo reached out to Dennis Bente, a professor of microbiology and immunology at the University of Texas Medical Branch. We spoke to Bente about why ticks are becoming a bigger problem, the best ways right now to protect ourselves against them, and the potential innovations that could eventually help us beat back the tick menace. The following conversation has been lightly edited for grammar and clarity.
Ed Cara, Gizmodo: I live in the northeastern U.S., and my friends and family, especially dog owners, often complain about needing to look out for ticks sooner than they used to. Is the tick season really getting longer and larger? And what seem to be the major reasons why?
Bente: Yes, your friends and family are absolutely correct in their observations. The tick season in the Northeastern United States has indeed become longer and more intense, with multiple scientific studies confirming both the expansion of tick activity periods and the growth of tick populations.
What was once a relatively predictable seasonal threat has evolved into a year-round concern in many areas. The evidence shows that ticks are now active in winter due to climate change, with adult deer ticks active at temperatures as low as 14 degrees Fahrenheit [-10 degrees Celsius]. This has led to a year-round need for vigilance, as ticks now emerge whenever the ground is unfrozen and temperatures exceed freezing, extending their season beyond traditional months. Climate warming accelerates tick development, increases survival, and enables northward expansion at about 28 miles [45 kilometers] per year, especially in the Northeast. Factors like recovering deer populations, reforestation, landscape fragmentation, and fire suppression have also promoted tick populations by providing ideal habitats and microclimate regimes that favor tick survival.
Gizmodo: When it comes to tick germs, people are probably most familiar with Lyme disease. But there are plenty more out there. What are some of the lesser-known tickborne diseases that keep you up at night? And are these diseases, like Lyme, becoming more common?
Bente: While Lyme disease dominates public awareness of tickborne illnesses, it represents just the tip of a much larger iceberg.
Powassan virus (POWV) stands out as perhaps the most frightening tickborne pathogen in North America. This flavivirus can cause severe encephalitis with mortality rates approaching 18.8% and devastating neurological consequences in 72.7% of survivors. Unlike other tickborne diseases, POWV can be transmitted within just 15 minutes of tick attachment, giving victims almost no opportunity for preventive tick removal.
... continue reading