Table 1. Reported reactivities of commercially available crossreactive anti-LPS mAbs used in these studies.

mAb	LPS specificity	Species	Isotype
15306	Shigella sonnei Salmonella typhimurium Serratia marcescens Proteus mirabilis Proteus vulgaris Acinetobacter calcoaceticus	Mouse	IgG2a
15308	Enterobacter aerogenes Serratia marcescens Proteus mirabilis Acinetobacter calcoaceticus Pseudomonas aeruginosa	Mouse	IgG3
15174	Chlamydia trachomatis	Mouse	IgG2a

Antibodies were assessed by ELISA for binding to purified LPS. LPS of Chlamydia trachomatis lacks the O-polysaccharide region most distal to lipid A. Thus, although being marketed as anti-Chlamydia antibody, mAb 15174 was chosen for its potential reactivity towards conserved core regions of LPS.