After the adult vaccine trials of 18 and up, a drug regulators had a choice in terms of what kind of evidence they need to move down to younger ages. And that the choice they went with was immuno bridging. Immuno bridging means is that we're no longer going to ask the manufacturer to prove that you reduce symptomatic sars cove to. 4 years old has a lower risk than a triple vaccinated forty year old. The potential upside olo, yes, the risk of coven having a severe reaction to coved is ergetting it is lower,. In fact, it's so low that a four-year-old has a lowerrisk than a triple vaccinating 40