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Journal of Clinical Microbiology, December 1998, p. 3721-3723, Vol. 36, No. 12
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Misleading Manifestations of Coccidioides immitis In Vivo

Leo Kaufman,1,* Gustavo Valero,2 and Arvind A. Padhye1

Mycotic Diseases Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333,1 and University of Texas Health Science Center at San Antonio, McAllen Medical Center, McAllen, Texas2 78501

Received 22 June 1998/Returned for modification 21 July 1998/Accepted 31 August 1998

We describe a case of coccidioidomycosis in which several unusual morphologic forms of Coccidioides immitis occurred in biopsy tissue from the right lower lung of a patient. To our knowledge, this is the first case where so many diverse morphologic forms were manifested in a single patient in the absence of typical endosporulating spherules. Immature spherules demonstrating segmentation mimicked morula forms of Prototheca spp. Certain elements resembled budding cells of Blastomyces dermatitidis. These consisted of juxtaposed immature spherules without endospores, a germinating endospore, or thick-walled hyphal cells. Branched, septate hyphae and moniliform hyphae consisting of chains of thick-walled arthroconidia or immature spherules were also present. Complement fixation and immunodiffusion tests performed on the patient's serum were negative for C. immitis, B. dermatitidis, and Histoplasma capsulatum antibodies. Fluorescent-antibody studies were carried out with a specific C. immitis conjugate. All of the diverse fungal tissue elements stained positive with a moderate to strong (2 to 3+) intensity.

* Corresponding author. Mailing address: Mail stop G-11, Centers for Disease Control and Prevention, Atlanta, GA 30333. Phone: (404) 639-3547. Fax: (404) 639-3546. E-mail: LEK1{at}ciddbd2.em.cdc.gov.

Journal of Clinical Microbiology, December 1998, p. 3721-3723, Vol. 36, No. 12
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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