Why Some People Never Get Sick — And It's Not Luck

You know someone who never gets sick. Your coworker. Your sibling. Everyone around them is coughing and sneezing — and they walk through winter untouched. You've called it luck. But the real answer is far stranger. This video explores the actual science behind immune resistance — from the infamous Common Cold Unit in Salisbury where scientists deliberately infected volunteers, to the discovery of trained immunity by immunologist Mihai Netea, to the role of HLA genetics, NK cell memory (Catherine Blish), and sex hormones in immune response (Sabra Klein). Sources: Common Cold Unit (Salisbury, 1946–1989) — human challenge studies Netea, M. et al. — trained immunity, BCG vaccine research HLA genetics — variation in viral recognition Blish, C. — NK cell memory Klein, S. (Johns Hopkins) — sex hormones and immune response If this changed how you see your immune system, like and subscribe for more science in doodle form. #immunesystem #health #science #nevergetsick #coldandflu #humanbody #biology #scienceexplained #trainedimmunity #immunity #whydontigetsick #education #doodle #2danimation #stickman #healthscience #viralfacts #learn #anatomy #humanbiology