No. The difference is mostly in viral load. Delta can seriously ramp up its production and make an infected person infectious in 1-2 days. Only neutralizing ant

No. The difference is mostly in viral load. Delta can seriously ramp up its production and make an infected person infectious in 1-2 days. Only neutralizing antibodies can counter this so fast and 2 dose regimen dose to build level high enough often enough. Increase from booster is 5 fold compared to the level from 2nd dos and is even higher for seniors. Levels of neutralizing antibodies that work against Wuhan variant and Delta variant are about the same.