It is the responsibility of travellers to check which measures apply to their travels. Countries or airlines may impose additional requirements regarding the health of travellers in connection with the outbreak of the Corona virus (COVID-19). This includes wearing face masks, vaccination and testing obligations, providing a health certificate and/or possible restrictions on luggage. Leiden2022 therefore advises all travellers to check prior to the trip what these possible additional requirements are with the relevant airline and/or the relevant (transit/transfer) country. Consult the websites of the airline, the Ministry of Foreign Affairs and local authorities for this. Information can change shortly before departure or during the stay. The traveller is responsible for being aware of the most current information. As a National Organiser, we expect you to take responsibility and leadership for the participants in this. Airlines may refuse travellers on the basis of possible health risks and may require to sign a health certificate or may require them to have an authorized certificate through a medical institution. See https://www.atpi.com/nl/about/atpi-alerts-travel-restrictions-per-country-dueto-coronavirus-covid-19/ for more information.