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Sore arm, fatigue, muscle pain and fever are some of the side effects being reported in those receiving COVID-19 vaccines, and experts say that's mostly a good thing. Vaccines are supposed to trigger an immune response, they say. That's how you know they're working. "If you have a vaccine that doesn't produce a reaction in people, the resulting immune response is weaker," said Earl Brown, a microbiologist with the University of Ottawa. Brown says vaccines work by stimulating our immune cells to grow and communicate with each other, giving directions on where to set up for an impending attack by the virus. That results in inflammation, with some of those cells traveling to lymph nodes and causing swelling. The mRNA vaccines from Pfizer-BioNTech and Moderna give immune cells instructions to make the COVID spike protein and produce antibodies. Viral vector vaccines like Oxford-AstraZeneca and Johnson & Johnson, meanwhile, force an immune response from th

Earl brownSide effectsImmune responseImmune cellsMrna vaccinesLynora saxingerCovid vaccinesAdverse effectsThe vaccinesஏர்ல் பழுப்புபக்க விளைவுகள்நோய் எதிர்ப்பு சக்தி பதில்நோய் எதிர்ப்பு சக்தி செல்கள்தடுப்பு மருந்துகள்தி தடுப்பு மருந்துகள்