Abstract
Immunization of Balb/c mice with conjugates of oligosaccharide haptens and crystalline bacterial surface-layer proteins (S-layers) primed the mice for a strong, hapten-specific, delayed-type hypersensitivity (DTH) response. Conjugates of haptens with bovine serum albumin produced only weak DTH responses but, when mixed with aluminium hydroxide, elicited DTH responses comparable to those against S-layer conjugates. Surface-layer conjugates also elicited strong anti-hapten DTH responses when administered by an oral/nasal route. Apparently, the natural assembly of S-layer proteins into large, two-dimensional arrays endows them with intrinsic adjuvant properties.
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