priceQQ t1_j772hmv wrote on February 4, 2023 at 4:04 PM

Reply to comment by zholo in New evidence suggests that ‘hybrid’ immunity, the result of both vaccination and a bout of COVID-19, can provide partial protection against reinfection for at least eight months. Immunity acquired by booster vaccination alone seems to fade somewhat faster. by MistWeaver80

Partly why not X has to do with trial design early on. It’s harder to do large trials for different regimens. Most people believe the original two courses were too close together though.