A call for registration to the inter-laboratory test for tetracycline determination will be send in September 2022 to NRLs from European Union and bordering countries implicated in oral vaccination programmes. The Panel will have to be tested in October 2022. Tetracycline is widely used as biomarker for rabies vaccine bait uptake evaluation. After its consumption, the antibiotic is incorporated into bones and teeth in vaccinated fox population. The goal of the ILT is to evaluate the laboratories capacities to detect the tetracycline in red fox teeth’s as well as the age category of foxes. A report on this trial should be issued in the end of 2022