“…Impaired cellular and humoral immune responses after two-dose vaccination schemes are extensively reported in CKD patients, showing a stronger immune response in HD patients [ 9 , 17 , 18 , 21 ]. Most studies included mRNA vaccinated patients, and only a few studies evaluated the immune responses of CoronaVac schemes in a cohort that included KT patients [ 16 , 36 , 37 , 38 , 39 , 40 ] and/or HD patients [ 14 , 41 , 42 , 43 , 44 ]. Here we show that HD and KT patients have a reduced humoral and cellular immune response after a primary scheme with either CoronaVac or BNT162b2 that increases after a BNT162b2 booster.…”