A case of diphtheria has been confirmed in the Dunkerquois area, according to the Regional Health Agency of Hauts-de-France (ARS). The infected individual was hospitalized at the Dunkerque hospital and is receiving treatment from the Lille hospital. The ARS has taken necessary measures to prevent the spread of the disease among those who have had contact with the patient. Healthcare workers who came into contact with the patient have been given preventive antibiotic treatment, and their health is being monitored by occupational health services. These services also assess their health status and may organize additional medical checks if needed. The ARS is currently identifying close contacts of the patient and continues to search for individuals who may have had risky exposure to the infected person. The patient may have been in contact with groups of people who recently arrived in France and are staying in camps along the coast. This is an important step in containing the spread of the disease, as diphtheria is highly contagious and can lead to severe complications if not treated promptly. Diphtheria is an infectious disease caused by a bacterium and is characterized by symptoms such as a sore throat, fever, and swelling in the neck. In some cases, particularly when the patient is not fully vaccinated, the infection can lead to serious complications, including damage to the heart and nervous system. The disease spreads mainly through close contact, especially through the inhalation of respiratory droplets from an infected person. It can also be transmitted through skin wounds or, less commonly, through contact with contaminated objects. Diphtheria is a rare disease in France, largely due to a strong vaccination program. Vaccination is mandatory for infants and includes several booster shots throughout a person's life to maintain immunity. The incubation period—the time between exposure to the bacteria and the appearance of symptoms—is typically between two and five days. Public health authorities remain vigilant to ensure that such rare cases do not lead to outbreaks, especially in communities where vaccination rates may be lower.