More than a quarter of people with Lyme disease continue to have long-term symptoms that lead to limitations in daily life even after treatment.

Every year about 1.5 million ticks bite someone in the Netherlands, especially between March and October. Most people will not get sick of that.

Research by RIVM shows that the participants in the so-called tROM project, their supervisors and other people involved may have been exposed to chromium-6.