Mapping to predict the distribution of ticks in Switzerland

(Image: Pixabay CC0) - A comprehensive study by EPFL and Lausanne University Hospital (CHUV) has enabled researchers to map the geographical distribution of ticks in Switzerland for the first time, as well as to determine whether they are carriers of chlamydia. Little is known about these bacteria, but ticks can potentially pass them to humans. The team found that zones conducive to tick proliferation have expanded by 10% over the last decade. Hikers setting out on one of Switzerland's many walking trails often bring back beautiful photos, the occasional cramp and - quite unintentionally - ticks. These tiny acarids, which are present in dense undergrowth and at the edges of forests, are particularly active in hot weather and attach themselves to human and animal hosts passing nearby. Despite their small size, they can transmit potentially serious diseases such as Lyme disease and tick-borne encephalitis. Recent research by the Institute of Microbiology at CHUV has shown that ticks are often carriers of large amounts of chlamydia, a still poorly-understood bacteria that can be passed to humans and cause secondary disease.