RIVM and Wageningen University researchers expect the tick bite season to reach its peak in the next few weeks. The peak will coincide with the start of the summer holidays.

Ticks are active again, as shown by the increase in tick bite reports on Tekenradar.nl. Quick action is important: the faster you remove a tick after it bites you, the lower your risk of contracting Lyme disease.

People who live in areas with poor air quality are more likely to become infected with SARS-CoV-2. Moreover, the symptoms of COVID-19 are more severe, leading to more hospitalisations and deaths. This is the outcome of a study conducted by RIVM, Utrecht University, Wageningen University & Research and the Netherlands Municipal Public Health Services and Medical Assistance in Accidents and Disasters.

Each year, approximately 27,000 people are diagnosed with Lyme disease. For most, the symptoms disappear after treatment with antibiotics. Unfortunately, 25% of those treated have chronic symptoms, such as fatigue, concentration disorders or pain.

In 2021, the number of Lyme disease diagnoses with a red ring or rash– known as an erythema migrans, or EM – remained as high as in the previous survey in 2017. GPs diagnosed 25,600 patients with a red ring or rash caused by the Lyme bacteria.

The overall air quality in 2022 was slightly worse than in 2021. Weather conditions such as temperature and drought played an important role in this difference. This is according to the large-scale concentration maps published by RIVM each year.

In 2023, RIVM will take systematic measurements of ultrafine particles in the outside air for the first time. This is necessary because little is known at present about ultrafine particles and their potential health effects. Ultrafine particles must be measured with different equipment than that usually used for particulate matter.

In 2022, the reported number of tick bites in the Netherlands fell by a third compared to previous years. In order to find a satisfactory explanation for such differences, researchers at WUR and RIVM have initiated a large-scale study via Tekenradar.nl. This will give them more insights into the 1.5 million tick bites in the Netherlands every year.

In 2022, the European Commission introduced a proposal for stricter air quality standards. With existing policy measures, the air quality in most of the Netherlands will meet these requirements by 2030.

RIVM expects the air quality to be poor or very poor for a brief period over Easter, particularly in areas where Easter fires are lit. This is because the burning of wood leads to high local concentrations of particulate matter in the air. These high concentrations may cause health problems. People affected by these problems are advised to avoid strenuous physical activity.