Task: Answer Verification
Input (English): Question: Is outer membrane protein P4 required for virulence in the human challenge model of Haemophilus ducreyi infection?
Answer: Our data suggest that, unlike e (P4), H. ducreyi OmpP4 is not a suitable vaccine candidate. OmpP4 may be dispensable for virulence because of redundant mechanisms in H. ducreyi for heme acquisition and NAD utilization.
Output (English): no