Third-country nationals subjected to the screening should be subject to a preliminary health check by qualified medical personnel with a view to identifying any needs for health care or isolation on public health grounds. Qualified medical personnel should be able to decide, based on the medical circumstances concerning the general state of each individual third-country national, that no further health check during the screening is necessary. That preliminary health check should be carried out by qualified medical personnel belonging to one of the following categories of the ISCO-08 classification of the International Standard Classification of Occupations under the responsibility of the International Labour Organization: 221 Medical Doctors, 2221 Nursing Professionals, or 2240 Paramedical Practitioners.