Unusual Reaction: COVID Vaccine and Lymph Node Inflammation

This: a man in Brazil received his third Pfizer COVID-19 shot and soon after, his intestinal lymph nodes started to inflame. This isn't the typical reaction to the vaccine. Usually, lymph nodes near the injection site swell up a bit. But in this case, it was the mesenteric lymph nodes, located deep in the belly. Doctors were puzzled. The patient had no health issues that could explain this. Doctors ran tests and looked at tissue samples under a microscope. They couldn't find any signs of infection. This raised a question: could the vaccine have triggered this rare reaction? It's important to note that reactions like this are very rare. Most people who get vaccinated don't experience anything like this. But it's a reminder that even the best-studied vaccines can have unexpected side effects.