On the risks side, AstraZeneca, Pfizer and Moderna have all claimed a lack of safety concerns. But in the Phase 1 and 2 trials of the AstraZeneca vaccine, moderate to severe adverse events were experienced by 70% of those receiving the covid jab. With the Pfizer vaccine, nearly 4% of people suffered from severe – or Grade 3 – adverse events. These grade 3 adverse events aren't a walk in the park – they're just one category down from grade 4 adverse events that are described as "potentially life threatening events" that require hospitalisation and critical care. People with Grade 5 events don't get to tell their story, but the more separated in time a death is from a vaccination, as hundreds of families have found in the various national vaccine courts, the harder it gets to prove a causal relationship.