New study finds COVID vaccines linked to increases in heart, brain, blood disorders | 19 Feb 2024 | The largest COVID vaccine study to date has identified some risks associated with the shot. Researchers from the Global Vaccine Data Network (GVDN) in New Zealand analyzed 99 million people who received COVID vaccinations across eight countries. They monitored for increases in 13 different medical conditions in the period after people received a COVID vaccine. The study, which was published in the journal Vaccine last week, found that the vaccine was linked to a slight [!?!] increase in neurological, blood and heart-related medical conditions, according to a press release from GVDN. People who received certain types of mRNA vaccines were found to have a higher risk of myocarditis, which is inflammation of the heart muscle. Some viral-vector vaccines were linked to a higher risk of blood clots in the brain, as well as an increased likelihood of Guillain-Barre syndrome, a neurological disorder in which the immune system attacks the nerves.