Humoral antibody response to glutaraldehyde-treated antigens of Dermatophilus congolensis

Summary Glutaraldehyde‐treated whole cell antigens (GA.WcA) of Dermatophilus congolensis induced in guinea pigs immunological memory in contrast to cell wall antigens treated similarly (GA.CwA). However, GA.WcA could not induce a secondary response in animals primed with untreated WcA while GA.CwA on the other hand did stimulate a secondary response in animals primed with untreated CwA. Primary antibody production was induced by both GA.CwA and untreated CwA to a similar level in their respective hosts but it was the secondary response that was found similar in response to GA.WcA and untreated WcA. However, both untreated WcA and CwA induced primary and secondary antibody production in their respective hosts though these responses were considerably higher in guinea pigs given untreated CwA. This study showed that both untreated and GA‐treated antigens of D. congolensis are capable of stimulating antibody production in guinea pigs but they differ in their levels of stimulation.