An inhaled Covid vaccine booster was more than 5-fold effective for inducing neutralizing antibodies at 28-days, and more durable at 1-year, than shots, vs Omicron BA.5 in a randomized trial
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(23)00350-X/fulltext @thelancetinfdis