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Figure 9 | BMC Microbiology

Figure 9

From: Expression of urease by Haemophilus influenzaeduring human respiratory tract infection and role in survival in an acid environment

Figure 9

Human antibody response to urease. Results of ELISAs measuring serum IgG to purified recombinant urease C in serum samples from adults with COPD who experienced exacerbations due to H. influenzae. Patient numbers (N = 18) are noted on the X-axis. The per cent changes from pre exacerbation to post exacerbation are shown on the Y-axis. The cutoff value (dotted line) for a significant increase in antibody level was determined by averaging the difference between 8 control pairs of sera from patients who had negative sputum cultures and were clinically stable (see text).

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