Anaphylaxis is a severe and sudden allergic reaction that typically occurs within seconds to minutes of an exposure such as the COVID-19 vaccine. It is reasonable to conclude that Aaron’s death was not attributable to an allergic or anaphylactic reaction to the vaccine since it had been 17 days since it was administered. However, this does not preclude the possibility of a vaccine causing or contributing to adverse events or deaths. Vaccine deaths generally result from aggravations of existing comorbidities. CKTK It’s extremely difficult to determine on an individual basis whether a vaccine contributed to death. A 2010 report by the U.S. Department of Health and Human Services, for example, concluded that fewer than 1% of vaccine adverse events are reported to VAERS.