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Hypersensitivity Reactions Although, the immune system is primarily programmed to protect our body against microbes such as bacteria, viruses, and fungi, unexpected excesses of the immune response may lead to disease states. The excessive immune responses are usually referred to as hypersensitivity reactions. The term hypersensitivity (HS) should be used to describe objectively reproducible symptoms Read More

A 19 month old infant presents with marked leg swelling, pain and inability to walk within 6 hours of receiving booster vaccinations. The child had been ambulatory for the prior 6 months and was now no longer able to walk