The 80-kDa D15 antigen (D-15-Ag) has previously been shown to be a tar
get for protective immunity and conserved amongst typeable and nontype
able Haemophilus influenzae. Here, the gene encoding D-15-Ag is shown
to encode a 797-aa polypeptide which, after cleavage of the predicted
signal peptide, would have a molecular mass of 85632 Da.