The more important result is although Delta is resistant to being neutralized by existing antibodies, it does not prevent it in serum-trials against vaccinated individuals, the like most biological systems the human immune system is exponential: starting from an effective antibody response, it can overwhelm any nascent infection (i.e. hospitalizations would not be expected to rise).
The number I've seen is a 3-5 fold reduction in the kinetics of neutralization [1] - this is concerning for whether you can spread it, but seems to my eye pretty consistent with hospitalization effectiveness remaining about the same.
The number I've seen is a 3-5 fold reduction in the kinetics of neutralization [1] - this is concerning for whether you can spread it, but seems to my eye pretty consistent with hospitalization effectiveness remaining about the same.
[1] https://www.nature.com/articles/s41586-021-03777-9