“From the moment the patient has a test, even negative, they must wear a mask on flights. Avoid removing it, and do not serve food or drink, so that there is no possibility for these patients who are moderately positive to contaminate their neighbours,” recommended Jean-Claude Azoulay, vice-president of the National Union of Biological Physicians, on Europe 1. “I think we should continue to do PCR tests and only use antigen tests when travellers really have not been able to get tested, or when there is a stopover.”