“…large specific surface area for payload delivery, enhanced bioavailability of the payloads, and multiple surface functionalization) [ 192 ]. There are several ways to form nanogels, including (i) self-assembly [ 60 , 121 , [193] , [194] , [195] , [196] , [197] ]; (ii) emulsion polymerization [ 198 , 199 ]; and (iii) particle replication in nonwetting template (PRINT) technology [ 200 ]. Synthetic polymers [ 121 , 193 , 195 , 200 ], polysaccharides [ 60 , [196] , [197] , [198] , [199] ] and their combination [ 201 ] have been developed to form nanogels for vaccine applications.…”