While all three promoters were expressed across different cell infection models, nucleotide sequence variation across strains was noted for ompAP, and the tsa56P-fl promoter (fl—full-length promoter with up and down sequences) had no activity in E. coli, leaving the prime candidates as tsa22P-down/fl and tsa56P-down/up. The gene discussed is FLT3LG; the disease is infection.