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CLINICAL CHARACTERISTICS AND ENDOSCOPIC FINDINGS ASSOCIATED WITH BLASTOCYSTIS HOMINIS IN HEALTHY ADULTS

Ninety-nine individuals with stools positive for Blastocystis hominis but negative for other parasites were identified from medical records of healthy adults who had received a physical examination at Taipei Veterans General Hospital from November 2000 to October 2002. The medical records of these 99 positive cases and 193 randomly selected controls, matched for age, sex, and date of examination, were retrospectively reviewed. The pathogenicity of B. hominis could not be demonstrated due to a lack of association with the development of gastrointestinal symptoms or pathologic findings on endoscopic examination. Multivariate analyses revealed that chronic hepatitis B infection was a predisposing condition to the acquisition of B. hominis (odd ratio = 2.848, 95% confidence interval = 1.299–6.242, P = 0.009), and concentration of urate was significantly lower in B. hominis-positive individuals (mean ± SD = 361.64 ± 87.44 versus 392.57 ± 93.38 µmol/L; P = 0.009). Among the 64 individuals who underwent gastric biopsy, Helicobacter pylori was found more frequently in the individuals harboring B. hominis (19 of 26 versus 15 of 38; P = 0.017).

Received April 3, 2003. Accepted for publication May 12, 2003.

Authors’ addresses: Te-Li Chen, Section of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7494, Fax: 886-2-2873-0052, E-mail: tlchen{at}vghtpe.gov.tw. Hsin-Pai Chen, Section of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7494, Fax: 886-2-2873-0052, E-mail: chenhp{at}ethome.net.tw. Chang-Phone Fung, Section of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7494, Fax: 886-2-2873-0052, E-mail: cpfung{at}vghtpe.gov.tw. Cheng-Yi Liu, Section of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7531, Fax: 886-2-2873-0052, E-mail address: cyliu{at}vghtpe.gov.tw. Che-Chang Chan, Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2871-2121-3353, Fax: 886-2-2873-9318, E-mail: ccchan{at}vghtpe.gov.tw. Chih-Pei Lin, Department of Pathology and Laboratory Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7125, Fax: 886-2-2874-0920, E-mail: cplin{at}vghtpe.gov.tw. Wan-Leong Chan, Section of General Medicine, Department of Medicine, Taipei Veterans General Hospital, 210, Shih-Pai Road, Section 2, Taipei, 11217, Taiwan, Republic of China, Telephone: 886-2-2875-7605, Fax: 886-2-2875-7703, E-mail: wlchan{at}vghtpe.gov.tw.

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