Ticks in the northern U.S. states, mosquitoes in the south. They’ve been invited by climate change, and are accompanied by Lyme disease, West Nile Virus, Zika, and other party crashers. Workers in construction, utilities, agriculture, and other outdoor settings are especially at risk—but so are their employers if these diseases result in disability (or WC) leaves. Luckily, protective clothing, repellents and frequent checks can help avoid the worst outcomes. Making workers aware of the risks, setting preventive policies, and providing employees with the time, resources and encouragement to develop good work habits should become a focus for employers in the most at-risk industries.