An immune reaction refers to the body's response to pathogens, allergens, or foreign substances.

प्रतिरक्षा प्रतिक्रिया

English Usage: The patient experienced a severe immune reaction after receiving the vaccine.

Hindi Usage: रोगी ने वैक्सीन लगवाने के बाद गंभीर प्रतिरक्षा प्रतिक्रिया का अनुभव किया।