BackgroundClostridium difficile infection can result in asymptomaticcarriage, mild diarrhea, or fulminant pseudomembranous colitis.We studied whether antibody responses to C. difficile toxinsaffect the risks of colonization, diarrhea, and asymptomaticcarriage.
Methods We prospectively studied C. difficile infections inhospitalized patients who were receiv-ing antibiotics. Serialstool samples were tested for C. difficile colonization by cytotoxinassay and culture. Serum antibody (IgA, IgG, and IgM) levelsand fecal antibody (IgA and IgG) levels against C. difficiletoxin A, toxin B, and nontoxin antigens were measured by anenzyme-linked immunosorbent assay (ELISA).
Results Of 271 patients, 37 (14 percent) were colonized withC. difficile at the time of admission, 18 of whom were asymptomaticcarriers. An additional 47 patients (17 percent) became infectedin the hospital, 19 of whom remained asymptomatic. The base-lineantibody levels were similar in the patients who later becamecolonized and those who did not. After colonization, those whobecame asymptomatic carriers had significantly greater increasesin serum levels of IgG antibody against toxin A than did thepatients in whom C. difficile diarrhea developed (P<0.001).The adjusted odds ratio for diarrhea was 48.0 (95 percent confidenceinterval, 3.4 to 678) among patients with colonization who hada serum level of IgG antibody against toxin A of 3.00 ELISAunits or less, as compared with patients with colonization whohad a level of more than 3.00 ELISA units.
Conclusions We find no evidence of immune protection againstcolonization by C. difficile. Howev-er, after colonization thereis an association between a systemic anamnestic response totoxin A, as evidenced by increased serum levels of IgG antibodyagainst toxin A, and asymptomatic carriage of C. difficile.
Source Information
From the Divisions of Gerontology (L.K.) and Gastroenterology (M.W., A.Q., C.P.K.), Beth Israel Deaconess Medical Center and Harvard Medical School, Boston.
Address reprint requests to Dr. Kelly at the Gastroenterology Division, Dana 601, Beth Israel Deaconess Medical Center, 330 Brookline Ave., Boston, MA 02215, or at ciaran_kelly{at}caregroup.harvard.edu.
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