The highest scoring sequences in Blast should give you an insight about the degree of conservation for this region.
Try querying your sequence against Pfam http://pfam.xfam.org/ to see if that domain is actually conserved. Another thing you can do is to see which amino acid residues remain conserved in this region and if it has any distant homologs through jackhmmer http://hmmer.janelia.org/search/jackhmmer.

If your region is short enough you may consider writing a script that search for it across several Leptospira species.