Le système Rhésus comprend plusieurs antigènes présents à la surface des globules rouges, dont le plus connu est l'antigène D responsable du statut Rh positif ou Rh négatif. Chez les individus porteurs du phénotype Rh-null, aucun antigène du système Rh n'est exprimé à la surface des hématies. Cette anomalie extrêmement rare résulte de mutations affectant les protéines impliquées dans l'expression du complexe Rh. Au-delà de sa rareté, le Rh-null présente un intérêt majeur en immunohématologie. Ces patients peuvent développer des anticorps dirigés contre pratiquement tous les antigènes Rh, rendant les transfusions particulièrement complexes. Dans la plupart des cas, un patient Rh-null ne peut recevoir du sang que d'un autre donneur Rh-null. L'étude de ce phénotype a également permis de mieux comprendre le rôle structural des protéines Rh dans la membrane érythrocytaire et leurs implications dans certaines anémies hémolytiques. Le Rh-null reste aujourd'hui l'un des phénotypes sanguins les plus rares et les plus fascinants de la médecine transfusionnelle. #medecine #Rhnull

💊 LE MÉDICAMENT DU JOUR : FUROSÉMIDE Connu pour son puissant effet diurétique, le furosémide est un médicament incontournable de la pharmacologie cardiovasculaire et rénale. Dans ce carrousel, découvrez son mécanisme d'action. #medecine #pharma #furosemide

Aujourd'hui, c'est la Journée mondiale de lutte contre la drépanocytose. Cette maladie génétique est particulièrement fréquente en Afrique, mais elle reste souvent mal comprise. Comprendre la drépanocytose, c'est comprendre comment une simple mutation de l'hémoglobine peut modifier toute la circulation sanguine. #medecine #Drepanocytose

❤️ 14 June is World Blood Donor Day 2026 🩸 One Drop of Humanity. Give Blood. Save Lives. 🙏🏼 Every day, blood donations help save lives during emergencies, childbirth, surgeries, cancer treatment and many other medical conditions. Yet blood cannot be manufactured. It can only come from generous donors. Did you know? 🩸 A single blood donation can help more than one patient. 🏥 Hospitals rely on a steady supply of safe blood every day. ❤️ Donating blood is one of the simplest ways to make a life-saving difference. Thinking about becoming a donor? ✅ Stay hydrated before donating ✅ Eat a healthy meal beforehand ✅ Bring identification if required ✅ Follow advice from your local blood service 🌍🤝 This World Blood Donor Day, let's celebrate the millions of voluntary donors whose kindness keeps health systems running and gives hope to patients and families around the world. Every donation matters. Every donor matters. Every drop counts. Learn more ➡️ https://www.who.int/campaigns/world-blood-donor-day/2026

WHO’s top news roundup 🚨 Health recommendations for travelers and attendees of the 2026 FIFA World Cup, read more ➡️ https://www.paho.org/en/news/8-6-2026-paho-issues-health-recommendations-travelers-and-attendees-2026-fifa-world-cup Heat Action Day: New WHO guidance helps authorities better protect people from the effects of heat, read more ➡️ https://www.who.int/europe/news/item/11-06-2026-heat-action-day--new-who-guidance-helps-authorities-better-protect-people-from-the-effects-of-heat WHO urges targeted action to strengthen emergency workforce capacities for shared health risks across the Asia-Pacific region, read more ➡️ https://www.who.int/westernpacific/news/item/11-06-2026-who-urges-targeted-action-to-strengthen-emergency-workforce-capacities-for-shared-health-risks-across-the-asia-pacific-region Vaccination: A thread of protection across generations, read more ➡️ https://www.afro.who.int/countries/congo/news/vaccination-thread-protection-across-generations

🌍🦟 One World Against Dengue 😮 Did you know that more than half of the world’s population is now at risk of dengue? Dengue is one of the fastest-growing infectious diseases globally, with an estimated 390 million infections every year. 💪 The good news? Dengue is preventable. ✅ Empty and clean containers that collect water ✅ Cover water storage tanks and buckets ✅ Dispose of waste properly ✅ Protect yourself from mosquito bites 🏡 Small actions at home can make a big difference for your family and community. 🌱✈️🏙️ Climate change, urbanisation, and global travel are helping dengue spread to new places, making prevention everyone’s responsibility. This *World Dengue Day (15 June)*, let’s work together to protect our communities and raise awareness about dengue prevention. 🤝 Every action counts. 🌍 Every outbreak prevented is a community protected. Learn more ➡️ https://www.who.int/news-room/events/detail/2026/06/15/default-calendar/world-dengue-day-2026

🌍🦟 One World Against Dengue 😮 Did you know that more than half of the world’s population is now at risk of dengue? Dengue is one of the fastest-growing infectious diseases globally, with an estimated 390 million infections every year. 💪 The good news? Dengue is preventable. ✅ Empty and clean containers that collect water ✅ Cover water storage tanks and buckets ✅ Dispose of waste properly ✅ Protect yourself from mosquito bites 🏡 Small actions at home can make a big difference for your family and community. 🌱✈️🏙️ Climate change, urbanisation, and global travel are helping dengue spread to new places, making prevention everyone’s responsibility. This World Dengue Day (15 June), let’s work together to protect our communities and raise awareness about dengue prevention. 🤝 Every action counts. 🌍 Every outbreak prevented is a community protected. Learn more ➡️ https://www.who.int/news-room/events/detail/2026/06/15/default-calendar/world-dengue-day-2026

🦠 Ebola: Early care saves lives 👩🏽‍⚕️ As the Democratic Republic of the Congo 🇨🇩 responds to an Ebola outbreak caused by the Bundibugyo virus, WHO has released its *first-ever guidelines covering all Ebola and Marburg viruses* to help health workers provide the best possible care. ⚠️ Ebola is a serious disease, but there is hope. Early supportive care, such as treating dehydration, managing symptoms and providing close medical monitoring, can significantly improve survival. Did you know? 🩺 There have been 72 Ebola and Marburg outbreaks in Africa since 1967. 💧 Early treatment with fluids and supportive care can make a life-saving difference. 🤝 People who recover also need follow-up care to support their long-term health. *How can you help?* ✅ Follow advice from health authorities ✅ Seek care early if symptoms appear ✅ Share facts, not rumours ✅ Support affected communities with compassion 🌍 Science, solidarity and early action save lives. Learn more ➡️ https://www.who.int/news/item/17-06-2026-who-issues-comprehensive-guidelines-on-filovirus-disease--including-ebola-and-marburg-disease