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Shukla S, Kakade M, Cherian S, Alagarasu K, Parashar D. Arctigenin from Arctium lappa L. inhibits chikungunya virus by affecting its entry and replication. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 128:155491. [PMID: 38489894 DOI: 10.1016/j.phymed.2024.155491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 02/23/2024] [Accepted: 02/26/2024] [Indexed: 03/17/2024]
Abstract
BACKGROUND Dengue and chikungunya, caused by dengue virus (DENV) and chikungunya virus (CHIKV) respectively, are the most common arthropod-borne viral diseases worldwide, for which there are no FDA-approved antivirals or effective vaccines. Arctigenin, a phenylpropanoid lignan from the seeds of Arctium lappa L. is known for its anti-inflammatory, anti-cancer, antibacterial, and immunomodulatory properties. Arctigenin's antimicrobial and immunomodulatory capabilities make it a promising candidate for investigating its potential as an anti-DENV and anti-CHIKV agent. PURPOSE The aim of the study was to explore the anti-DENV and anti-CHIKV effects of arctigenin and identify the possible mechanisms of action. METHODS The anti-DENV or anti-CHIKV effects of arctigenin was assessed using various in vitro and in silico approaches. Vero CCL-81 cells were infected with DENV or CHIKV and treated with arctigenin at different concentrations, temperature, and time points to ascertain the effect of the compound on virus entry or replication. In silico molecular docking was performed to identify the interactions of the compound with viral proteins. RESULTS Arctigenin had no effects on DENV. Various time- and temperature-dependent assays revealed that arctigenin significantly reduced CHIKV RNA copy number and infectious virus particles and affected viral entry. Entry bypass assay revealed that arctigenin inhibited the initial steps of viral replication. In silico docking results revealed the high binding affinity of the compound with the E1 protein and the nsp3 macrodomain of CHIKV. CONCLUSION This study demonstrates the in-vitro anti-CHIKV potential of arctigenin and suggests that the compound might affect CHIKV entry and replication. Further preclinical and clinical studies are needed to identify its safety and efficacy as an anti-CHIKV drug.
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Affiliation(s)
- Shridhar Shukla
- Dengue and Chikungunya Group, ICMR-National Institute of Virology, Pune, India 411001
| | - Mahadeo Kakade
- Dengue and Chikungunya Group, ICMR-National Institute of Virology, Pune, India 411001
| | - Sarah Cherian
- Dengue and Chikungunya Group, ICMR-National Institute of Virology, Pune, India 411001
| | - Kalichamy Alagarasu
- Dengue and Chikungunya Group, ICMR-National Institute of Virology, Pune, India 411001.
| | - Deepti Parashar
- Dengue and Chikungunya Group, ICMR-National Institute of Virology, Pune, India 411001.
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Rawat SK, Kale D, Nema S, Nema RK, Gupta S, Khadanga S, Biswas D. Detectable Viremia at Presentation Is a Predictor of Disease Severity in Chikungunya. Cureus 2024; 16:e58188. [PMID: 38741833 PMCID: PMC11089836 DOI: 10.7759/cureus.58188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2024] [Indexed: 05/16/2024] Open
Abstract
Background Chikungunya is a mosquito-borne re-emerging disease that has caused a significant number of outbreaks recently in diverse geographic settings across the globe. It leads to severe debilitating illness in a significant proportion of persons who are infected. Measures to limit the impact produced by recurrent outbreaks of the disease are limited and there is an urgent clinical need for early identification of those predisposed to develop severe disease. A comprehensive understanding regarding the proportion of individuals predisposed to developing severe disease is lacking as its correlation with detectable viremia is hinted at by some studies. In this context, we hypothesized that detectable viremia reflected in the diagnostic RT-PCR assay could be significantly associated with the development of severe disease in Chikungunya among those diagnosed on the basis of seroconversion. Our study aims to confirm the same in relation to disease severity among the suspected patients of Chikungunya in the setting of a tertiary care center. Methods In a prospective observational study at a tertiary care center, a total number of 1021 Chikungunya suspects presenting within seven days of illness were screened with Chikungunya Virus IgM ELISA from 2021 to 2023. Those having positive IgM results were further tested with RT-PCR in a blinded manner. According to the information entered into the predesigned form and the hospital follow-up/discharge data, the cases where symptoms like fever and joint pain persisted beyond two weeks were classified as severe versus those resolving within two weeks as mild. The patients in each group were compared for their clinical symptoms and association with the disease severity with detectable viremia (RT-PCR positivity). Results We identified a total of 178 (17.4%) lab-confirmed Chikungunya IgM-positive cases amongst the recruited patients. Here a total of 31 (18.9%) cases could be classified as severe and 133 (74.7%) as mild illness, the remaining 14 patients were excluded from analysis due to insufficient clinical data. Severe illness was significantly higher in elderly individuals belonging to more than 60 years (p = 0.01). Viremia was detected in 16 (9%), those with detectable viremia had higher odds (OR = 4.1) of manifesting as severe disease. Among the severe cases, the proportion of cases with RT-PCR positivity (8, 25.8%) at presentation was significantly higher (P = 0.01) versus those who presented with mild disease (7, 5.5%). Conclusion Our study reveals a correlation between detectable viremia in Chikungunya virus (CHIKV) patients and an increased risk of manifesting into a severe disease, where severe cases exhibited a significantly higher proportion of viremia, indicated by RT-PCR positivity. This study hints at the presence of viremia, joint symptoms, and elderly age as potentially useful clinical predictors of disease outcomes, these may serve as indicators for closer monitoring among individuals seeking medical attention due to Chikungunya infection. However, we need to validate these findings in future longitudinal studies incorporating multiple, time-bound follow-up data on clinical outcomes, viral titers, and its long-term complications.
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Affiliation(s)
- Sumit K Rawat
- Microbiology, Bundelkhand Medical College, Sagar, IND
- Microbiology, All India Institute of Medical Sciences, Bhopal, Bhopal, IND
| | - Dipesh Kale
- Microbiology, All India Institute of Medical Sciences, Bhopal, Bhopal, IND
| | - Shashwati Nema
- Microbiology, All India Institute of Medical Sciences, Bhopal, Bhopal, IND
| | - Ram K Nema
- Molecular Biology, Indian Council of Medical Research (ICMR) National Institute for Research in Environmental Health, Bhopal, IND
| | - Sudheer Gupta
- Next-Generation Sequencing (NGS) & Bioinformatics Division, 3B Blackbio Dx Ltd., Bhopal, IND
| | - Sagar Khadanga
- Internal Medicine, All India Institute of Medical Sciences, Bhopal, Bhopal, IND
| | - Debasis Biswas
- Microbiology, All India Institute of Medical Sciences, Bhopal, Bhopal, IND
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Virological, Serological and Clinical Analysis of Chikungunya Virus Infection in Thai Patients. Viruses 2022; 14:v14081805. [PMID: 36016427 PMCID: PMC9414365 DOI: 10.3390/v14081805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 08/09/2022] [Accepted: 08/15/2022] [Indexed: 11/17/2022] Open
Abstract
From 2018 to 2020, the Chikungunya virus (CHIKV) outbreak re-emerged in Thailand with a record of more than 10,000 cases up until the end of 2020. Here, we studied acute CHIKV-infected patients who had presented to the Bangkok Hospital for Tropical Diseases from 2019 to 2020 by assessing the relationship between viral load, clinical features, and serological profile. The results from our study showed that viral load was significantly high in patients with fever, headache, and arthritis. We also determined the neutralizing antibody titer in response to the viral load in patients, and our data support the evidence that an effective neutralizing antibody response against the virus is important for control of the viral load. Moreover, the phylogenetic analysis revealed that the CHIKV strains we studied belonged to the East, Central, and Southern African (ECSA) genotype, of the Indian ocean lineage (IOL), and possessed E1-K211E and E1-I317V mutations. Thus, this study provides insight for a better understanding of CHIKV pathogenesis in acute infection, along with the genomic diversity of the current CHIKV strains circulating in Thailand.
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A Case Report of Secondary Syphilis Co-Infected with Measles: A Diagnostic Dilemma with Fever and Rash. Trop Med Infect Dis 2022; 7:tropicalmed7050070. [PMID: 35622697 PMCID: PMC9144679 DOI: 10.3390/tropicalmed7050070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/04/2022] [Accepted: 05/07/2022] [Indexed: 11/26/2022] Open
Abstract
Fever and rash as manifestations of infection by microorganisms are collectively known as febrile exanthem. Since viruses are more frequently associated with fever and rash, these symptoms are thus impetuously termed viral exanthem. However, bacteria represent a frequently overlooked infectious etiology causing rash in humans. In addition, certain microbes may exhibit pathognomonic features that erupt during illness and facilitate clinical diagnosis. Conversely, coinfections often obscure the clinical characteristics of the primary disease and further challenge clinicians attempting to reach a diagnosis. We retrospectively looked at de-identified clinical data of a patient who presented to the Hospital for Tropical Diseases in Bangkok in July 2019 with complaints of fever and rash. The case involved a 35-year-old who presented with a 3-day history of fever, respiratory symptoms, myalgia, conjunctivitis, diarrhea, and a generalized maculopapular rash. On examination, the patient was febrile, tachycardic, and tachypneic, with a mean arterial pressure of 95 mmHg. A differential white blood cell count showed: leukocytes, 5800/µL; neutrophils, 4408/µL; lymphocytes, 406/µL; and platelets, 155,000/µL. Striking findings involving the integumentary system included Koplik’s spots and generalized maculopapular rash. Further serology revealed positive immunoglobulin (Ig)M and IgG for both measles and rubella virus, including reactive serology for Treponema pallidum. Here we describe the clinical course and management of this patient.
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Miqdhaadh A, Imad HA, Fazeena A, Ngamprasertchai T, Nguitragool W, Nakayama EE, Shioda T. Multisystem Inflammatory Syndrome Associated with SARS-CoV-2 Infection in an Adult: A Case Report from the Maldives. Trop Med Infect Dis 2021; 6:tropicalmed6040187. [PMID: 34698279 PMCID: PMC8544693 DOI: 10.3390/tropicalmed6040187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Accepted: 10/18/2021] [Indexed: 12/24/2022] Open
Abstract
The multisystem inflammatory syndrome in adults (MIS-A) is a novel syndrome observed during COVID-19 outbreaks. This hyper-inflammatory syndrome is seen predominantly in children and adolescents. The case of an adult from the Maldives who had asymptomatic SARS-CoV-2 infection three weeks before presenting to the hospital with fever, rash, and shock is presented. De-identified clinical data were retrospectively collected to summarize the clinical progression and treatment during hospitalization and the six-month follow-up. SARS-CoV-2 infection was confirmed by RT-PCR. Other laboratory findings included anemia (hemoglobin: 9.8 g/dL), leukocytosis (leukocytes: 20,900/µL), neutrophilia (neutrophils: 18,580/µL) and lymphopenia (lymphocytes: 5067/µL), and elevated inflammatory markers, including C-reactive protein (34.8 mg/dL) and ferritin (2716.0 ng/dL). The electrocardiogram had low-voltage complexes, and the echocardiogram showed hypokinesia, ventricular dysfunction, and a pericardial effusion suggestive of myocardial dysfunction compromising hemodynamics and causing circulatory shock. These findings fulfilled the diagnostic criteria of MIS-A. The case was managed in the intensive care unit and required non-invasive positive pressure ventilation, inotropes, and steroids. With the new surges of COVID-19 cases, more cases of MIS-A that require the management of organ failure and long-term follow-up to recovery are anticipated. Clinicians should therefore be vigilant in identifying cases of MIS-A during the pandemic.
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Affiliation(s)
- Ahmed Miqdhaadh
- Department of Medicine, Indira Gandhi Memorial Hospital, Malé 20002, Maldives; (A.M.); (A.F.)
| | - Hisham Ahmed Imad
- Mahidol Vivax Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan; (E.E.N.); (T.S.)
- Correspondence: or ; Tel.: +66-631501402
| | - Aminath Fazeena
- Department of Medicine, Indira Gandhi Memorial Hospital, Malé 20002, Maldives; (A.M.); (A.F.)
| | - Thundon Ngamprasertchai
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
| | - Wang Nguitragool
- Mahidol Vivax Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Emi E. Nakayama
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan; (E.E.N.); (T.S.)
| | - Tatsuo Shioda
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan; (E.E.N.); (T.S.)
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Imad HA, Phadungsombat J, Nakayama EE, Suzuki K, Ibrahim AM, Afaa A, Azeema A, Nazfa A, Yazfa A, Ahmed A, Saeed A, Waheed A, Shareef F, Islam MM, Anees SM, Saleem S, Aroosha A, Afzal I, Leaungwutiwong P, Piyaphanee W, Phumratanaprapin W, Shioda T. Clinical Features of Acute Chikungunya Virus Infection in Children and Adults during an Outbreak in the Maldives. Am J Trop Med Hyg 2021; 105:946-954. [PMID: 34339379 PMCID: PMC8592165 DOI: 10.4269/ajtmh.21-0189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 05/20/2021] [Indexed: 11/17/2022] Open
Abstract
The chikungunya virus is an arthritogenic arbovirus that has re-emerged in many tropical and subtropical regions, causing explosive outbreaks. This re-emergence is due to a genomic polymorphism that has increased the vector susceptibility of the virus. The majority of those infected with chikungunya virus exhibit symptoms of fever, rash, and debilitating polyarthralgia or arthritis. Symptoms can persist for weeks, and patients can relapse months later. Fatalities are rare, but individuals of extreme age can develop severe infection. Here, we describe the 2019 outbreak, the second-largest since the virus re-emerged in the Maldives after the 2004 Indian Ocean epidemic, in which a total of 1,470 cases were reported to the Health Ministry. Sixty-seven patients presenting at the main referral tertiary care hospital in the Maldives capital with acute undifferentiated illness were recruited following a negative dengue serology. A novel point-of-care antigen kit was used to screen suspected cases, 50 of which were subsequently confirmed using real-time reverse transcription-polymerase chain reaction. We describe the genotype and polymorphism of Maldives chikungunya virus using phylogenetic analysis. All isolates were consistent with the East Central South African genotype of the Indian Ocean lineage, with a specific E1-K211E mutation. In addition, we explored the clinical and laboratory manifestations of acute chikungunya in children and adults, of which severe infection was found in some children, whereas arthritis primarily occurred in adults. Arthritides in adults occurred irrespective of underlying comorbidities and were associated with the degree of viremia.
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Affiliation(s)
- Hisham Ahmed Imad
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Juthamas Phadungsombat
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Emi E. Nakayama
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Keita Suzuki
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
- POCT Products Business Unit, TANAKA Kikinzoku Kogyo, Hiratsuka, Japan
| | | | | | | | | | | | | | | | - Azna Waheed
- Indira Gandhi Memorial Hospital, Malé, Maldives
| | | | | | | | - Sana Saleem
- Health Protection Agency, Ministry of Health, Malé, Maldives
| | - Aminath Aroosha
- Health Protection Agency, Ministry of Health, Malé, Maldives
| | - Ibrahim Afzal
- Health Protection Agency, Ministry of Health, Malé, Maldives
| | - Pornsawan Leaungwutiwong
- Tropical Medicine Diagnostic Reference Laboratory, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Watcharapong Piyaphanee
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Weerapong Phumratanaprapin
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Tatsuo Shioda
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
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Imad HA, Matsee W, Kludkleeb S, Asawapaithulsert P, Phadungsombat J, Nakayama EE, Suzuki K, Leaungwutiwong P, Piyaphanee W, Phumratanaprapin W, Shioda T. Post-Chikungunya Virus Infection Musculoskeletal Disorders: Syndromic Sequelae after an Outbreak. Trop Med Infect Dis 2021; 6:52. [PMID: 33921055 PMCID: PMC8167736 DOI: 10.3390/tropicalmed6020052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/05/2021] [Accepted: 04/13/2021] [Indexed: 11/17/2022] Open
Abstract
The Chikungunya virus is a re-emerging mosquito-borne alphavirus. Outbreaks are unpredictable and explosive in nature. Fever, arthralgia, and rash are common symptoms during the acute phase. Diagnostic tests are required to differentiate chikungunya virus from other co-circulating arboviruses, as symptoms can overlap, causing a dilemma for clinicians. Arthritis is observed during the sub-acute and chronic phases, which can flare up, resulting in increased morbidity that adversely affects the activities of daily living. During the 2019 chikungunya epidemic in Thailand, cases surged in Bangkok in the last quarter of the year. Here, we demonstrate the chronic sequelae of post-chikungunya arthritis in one of our patients one year after the initial infection. An inflammatory process involving edema, erythema, and tenderness to palpation of her fingers' flexor surfaces was observed, with positive chikungunya IgG and negative IgM tests and antigen. The condition produced stiffness in the patient's fingers and limited their range of motion, adversely affecting daily living activities. Resolution of symptoms was observed with a short course of an anti-inflammatory agent. More research is required to determine whether sanctuaries enable chikungunya virus to evade the host immune response and remain latent, flaring up months later and triggering an inflammatory response that causes post-chikungunya arthritis.
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Affiliation(s)
- Hisham A. Imad
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.P.); (E.E.N.); (T.S.)
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan;
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
| | - Wasin Matsee
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Sajikapon Kludkleeb
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
| | - Punyisa Asawapaithulsert
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
| | - Juthamas Phadungsombat
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.P.); (E.E.N.); (T.S.)
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan;
| | - Emi E. Nakayama
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.P.); (E.E.N.); (T.S.)
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan;
| | - Keita Suzuki
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan;
- Point of Care Testing Products Business Unit, TANAKA Kikinzoku Kogyo, Hiratsuka 254-0076, Japan
| | - Pornsawan Leaungwutiwong
- Tropical Medicine Diagnostic Reference Laboratory, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Watcharapong Piyaphanee
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Weerapong Phumratanaprapin
- Bangkok Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (W.M.); (S.K.); (P.A.); (W.P.); (W.P.)
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Tatsuo Shioda
- Mahidol-Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.P.); (E.E.N.); (T.S.)
- Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan;
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