>But last I heard the vaccine is not that effective to Delta variant. That's not exactly the case. Neutralizing antibodies created from the vaccines work about

>But last I heard the vaccine is not that effective to Delta variant. That's not exactly the case. Neutralizing antibodies created from the vaccines work about as well against delta as they did against alpha. The main differences are that delta: * Spreads more efficiently * Has a shorter incubation period * Produces a higher viral load in those infected The incubation period being shorter means your T-cells have less time to ramp up in the case of naturally-waning antibody levels (which applies to people who were vaccinated at the beginning of the year), giving the infection more time to set in (remember, viruses grow exponentially). The higher viral load likewise means that the circulating antibody levels that were adequate for alpha may not be sufficient for delta. So we may see that people vaccinated with Moderna now have a better response against delta due to it creating twice as many antibodies. https://jamanetwork.com/journals/jama/fullarticle/2783797 https://jamanetwork.com/journals/jama/fullarticle/2783797