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Because most cases of secondary dengue virus infection are associated with an increased level of platelet-associated IgG, a high dose of intravenous immunoglobulin (IVIG) may have an effect on the development of severe thrombocytopenia in this disease. A randomized, controlled study was conducted with two treatment groups consisting of a treatment (IVIG) group (n = 15) and a non-treatment (non-IVIG) group (n = 16) to determine whether a high dose of IVIG is effective in hastening the recovery from thrombocytopenia in patients with secondary dengue virus infection. No significant difference was found in the baseline demographic data between the two groups. No adverse effect of IVIG was observed, but no effect in hastening the recovery of platelet counts was found in patients with secondary dengue infections. The lack of efficacy of IVIG suggests that platelet clearance by macrophages through Fc
receptors is not a primary mechanism in this disease.
Received August 22, 2007. Accepted for publication August 28, 2007.
Acknowledgments: We thank Aruturo Cabanban and Eumella Salva and other staff of San Lazaro Hospital, and the staff of the Research Biotechnology Division, St. Lukes Medical Center.
Financial support: This study was supported by a Grant-in-Aid for Scientific Research (B: 16406029) from the Ministry of Education, Science and Culture, Japan and the 21st Century COE Program of Nagasaki University.
* Address correspondence to K. Oishi, Laboratory for Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Japan. E-mail: oishik{at}biken.osaka-u.ac.jp
Authors addresses: Efren M. Dimaano and Edna A. Miranda, Blood Borne Diseases, San Lazaro Hospital, Manila, The Philippines. Mariko Saito, Shoko Honda, and Shingo Inoue, Department of Internal Medicine and Virology, Institute of Tropical Medicine Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan. Maria T. G. Alonzo, Myra D. Valerio, Cynthia A. Mapua, Ronald R. Matias, and Filipinas F. Natividad, Research and Biotechnology Division, St. Lukes Medical Center, 279 E. Rodriguez Sr. Boulevard, Cathedral Heights, Quezon City 1102, The Philippines. Atsushi Kumaori, Faculty of Risk and Crisis Management, Chiba Institute of Science, Choshi, Chiba 288-0025, Japan. Kazunori Oishi, Laboratory for Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871 Japan, Telephone: 81-6-6879-4253, Fax: 81-6-6879-4255, E-mail: oishik{at}biken.osaka-u.ac.jp.
Reprint requests: Laboratory for Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Osaka, 565-0871 Japan.
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