In forests or gardens, on the ground or on tree branches, certain caterpillars may be seen following each other in single file. These "processionary" caterpillars are insects with stinging hairs. The inflammatory reactions they can cause in humans and animals are sometimes serious.

The pinewood nematode (Bursaphelenchus xylophilus) is a microscopic worm that develops in conifers, particularly those of the genus Pinus, which can lead to the decline of the affected trees. In several regions of the world (Asia, Europe), this particularly destructive parasite has had serious consequences for forests and related industries. The pinewood nematode is therefore closely monitored, especially in the European Union, where it is classified as a priority quarantine organism. In France, an annual monitoring programme for the pinewood nematode has been in place for around 20 years. An outbreak was detected for the first time in November 2025 in the Landes département. ANSES has conducted several expert appraisals to assess the risks of introduction and establishment of the organism in France and to recommend management measures for pine wood and bark.

Listeriosis is a foodborne infection caused by the bacterium Listeria monocytogenes. Cases of listeriosis are rare in France but when they occur, they are severe. What foods are involved? What are the health impacts? Are certain population groups at greater risk? You will find the answers to these questions in this article.