The European Union’s drug regulator listed a rare nerve disorder known as Guillain-Barré syndrome (GBS) as a possible AstraZeneca COVID-19 vaccine side effect, according to the watchdog in a Wednesday update. The European Medicines Agency (EMA) said the AstraZeneca shot, known as Vaxzevria, was associated with 833 GBS cases as of July 31. That’s out of 592 million doses administered, the EMA said (pdf). Reported cases of GBS concern “suspected side effects” such as “medical events that have been observed after vaccination, but which are not necessarily related to or caused by the vaccine,” said the agency. “Pain in legs and arms or stomach and influenza-like symptoms have also been included in the product information as side effects,” it added. In another update this week (pdf), the EMA said that potential side-effects to Johnson & Johnson’s single-dose shot include “swollen lymph nodes, unusual or decreased feeling in the skin, tinnitus, diarrhea, and vomiting.” …