The presence of certain bacteria or chemicals can modulate the intestinal microbiota of pigs and chickens. Studying these factors could help at the farm level to tackle micro-organisms that are pathogenic to humans, such as Campylobacter and Salmonella .

Neonicotinoids have long been used to combat aphids in crops Repeated use of these active substances has led to the selection of insects capable of resisting them. A study on the green peach aphid carried out by ANSES in collaboration with a research scientist from the University of Exeter (UK), revealed that resistance was based on two distinct mechanisms in this species. One is specific to the product's mode of action and the other is based on its degradation. The scientists' findings show that interactions between resistance mechanisms are possible, which is vital knowledge for adapting and adjusting control strategies.

The small hive beetle is a parasite of honey bees. It was first detected on Reunion Island in July 2022. Genetic analyses conducted by ANSES's Sophia Antipolis Laboratory have revealed that the specimens that arrived on the island are similar to those found in China and the Philippines.

Scientists from ANSES, the Dynamicure joint research unit (Inserm/Universities of Caen and Rouen) and Caen University Hospital recently joined forces to study Klebsiella pneumoniae , a bacterium that is pathogenic to humans and horses. By analysing strains of K. pneumoniae collected from horses over a period of almost 30 years, they found a wide diversity of strains, some with increased antibiotic resistance

ANSES has developed a method for culturing Campylobacter hepaticus. Cases of poultry becoming infected with this bacterium have increased in France since 2019. Culturing it should provide an opportunity to track its spread on farms through genetic characterisation.

A study carried out in eight European countries confirms that pathogens can be transmitted from one species of pollinating insect to another. The health of wild pollinators can therefore be affected when a contaminated colony of honeybees is established nearby. Unlike in previous studies, the results did not show any significant effect of the type of crop grown in bee foraging areas.

For the first time in France, a single farm has been found infested with digestive parasites known as cyathostomins, or small strongyles, resistant to all three classes of antiparasitic drugs authorised for equines. They were discovered as part of a study carried out by an ANSES team on a racehorse stud farm.

Bacterial resistance to antibiotics is a major health problem for both humans and animals. In France, the use of antibiotics and the distribution of resistant bacteria are covered by several surveillance schemes that do not consistently or sufficiently collaborate with one another. The Surv1Health project, which has just been completed, aimed to identify ways of breaking down silos in the surveillance of antimicrobial resistance and making it more useful as part of the ‘One Health’ approach.

The common factor linking bluetongue, epizootic haemorrhagic disease, besnoitiosis, etc. is that they are all caused by pathogens transmitted to ruminants by arthropods such as ticks, midges or mosquitoes. ANSES has funded a review of studies carried out in metropolitan France, which highlighted the many gaps in current knowledge about the vectors found on cattle farms and the pathogens they can transmit. Such knowledge is nevertheless essential given current global changes, which are having an impact on vector distribution and therefore on the epidemiology of vector-borne diseases in livestock.