Expression vectors are described which permit the recombinant expression
of proteins which essentially contain, in addition to nucleic acid encoding the
recombinant protein, nucleic acid encoding a non-proteolytic analog of Haemophilus
Hin47 protein, with or without leader sequence, or nucleic acid encoding high
molecular weight proteins of non-typeable Haemophilus, which are hmwB, hmwC
or hmwBC.