Y. Kikuchi

S. Oka, N. Tachikawa, H. Gatanaga, 2000, Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology.

Trends in early and late diagnosis of HIV-1 infections in Tokyoites from 2002 to 2010.

S. Oka, H. Gatanaga, Y. Kikuchi, 2012, International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases.

Successful treatment for Kaposi sarcoma inflammatory cytokine syndrome in a severe CD4+ lymphocytopenic HIV patient.

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2019, AIDS.

Raltegravir can be used safely in HIV-1-infected patients treated with warfarin

H. Yazaki, S. Oka, K. Tsukada, 2012, International journal of STD & AIDS.

Favourable use of non-boosted fosamprenavir in patients treated with warfarin

S. Oka, K. Tsukada, H. Gatanaga, 2009, International journal of STD & AIDS.

Raltegravir-associated perihepatitis and peritonitis: a single case report.

S. Oka, K. Tsukada, H. Gatanaga, 2010, AIDS.

A randomized trial of reduced doses of azidothymidine in Japanese patients with human immunodeficiency virus type 1 infection.

S. Oka, Y. Kikuchi, K. Shimada, 1992, Internal medicine.

Assessment of HIV prevalence among MSM in Tokyo using self-collected dried blood spots delivered through the postal service

S. Oka, Y. Kikuchi, M. Takano, 2018, BMC Infectious Diseases.

Dilated cardiomyopathy in an adult human immunodeficiency virus type 1-positive patient treated with a zidovudine-containing antiretroviral regimen.

S. Oka, M. Hiroe, H. Gatanaga, 2003, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Efficacy and Immunologic Responses to Influenza Vaccine in HIV-1-Infected Patients

S. Oka, Takao Takahashi, K. Teruya, 2005, Journal of acquired immune deficiency syndromes.

Laboratory and Epidemiology Communications Rate of Subclinical Hepatitis A Virus Infection in Adult HIV- 1 -Infected Patients

S. Oka, N. Tachikawa, Y. Kikuchi, 2001 .

Leukocytopenia due to Zidovudine-and Neviraplne-Containlng

N. Tachikawa, Y. Kikuchi, A. Yasuoka, 2010 .

Effectiveness of subcutaneous growth hormone in HIV-1 patients with moderate to severe facial lipoatrophy.

S. Oka, N. Tachikawa, H. Gatanaga, 2007, Internal medicine.

Homozygous CYP2B6 *6 (Q172H and K262R) correlates with high plasma efavirenz concentrations in HIV-1 patients treated with standard efavirenz-containing regimens.

S. Oka, N. Tachikawa, T. Shirasaka, 2004, Biochemical and biophysical research communications.

Serum (1-->3) beta-D-glucan as a noninvasive adjunct marker for the diagnosis of Pneumocystis pneumonia in patients with AIDS.

H. Yazaki, S. Oka, K. Tsukada, 2009, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Underestimated Amoebic Appendicitis among HIV-1-Infected Individuals in Japan

S. Oka, T. Nozaki, M. Kaku, 2016, Journal of Clinical Microbiology.

Case of relapsed AIDS-related plasmablastic lymphoma treated with autologous stem cell transplantation and highly active antiretroviral therapy

S. Oka, K. Teruya, Y. Kikuchi, 2011, Rare tumors.

Unmasking latent extrapulmonary tuberculosis with newly diagnosed HIV-1 infection in a COVID-19 patient with prolonged fever

A. Shimomura, S. Oka, Yasuaki Yanagawa, 2022, Oxford medical case reports.

Neurocognitive dysfunction and brain FDG-PET/CT findings in HIV-infected hemophilia patients and HIV-infected non-hemophilia patients

T. Noguchi, S. Oka, R. Minamimoto, 2020, PloS one.

Ultrasensitive method to quantify intracellular zidovudine mono-, di- and triphosphate concentrations in peripheral blood mononuclear cells by liquid chromatography-tandem mass spectrometry.

S. Oka, H. Gatanaga, Y. Kikuchi, 2015, Journal of mass spectrometry : JMS.

Safety and efficacy of reduced-dose pentamidine as second-line treatment for HIV-related pneumocystis pneumonia.

S. Oka, H. Gatanaga, K. Teruya, 2020, Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy.

Case Report: Hemophagocytic Lymphohistiocytosis Caused by Disseminated Histoplasmosis in a Venezuelan Patient with HIV and Epstein-Barr Virus Reactivation Who Traveled to Japan.

S. Oka, Y. Miyazaki, M. Nagi, 2019, The American journal of tropical medicine and hygiene.

Diagnostic Utility of Quantitative Plasma Cytomegalovirus DNA PCR for Cytomegalovirus End-Organ Diseases in Patients With HIV-1 Infection

S. Oka, H. Gatanaga, K. Teruya, 2015, Journal of acquired immune deficiency syndromes.

Alpha-Fetoprotein and Highly Active Antiretroviral Therapy in Patients Coinfected with HIV-1 and Hepatitis C Virus

S. Oka, N. Tachikawa, Y. Kikuchi, 2001, European Journal of Clinical Microbiology and Infectious Diseases.

Prevalence of coinfection with human immunodeficiency virus and hepatitis C virus in Japan

S. Oka, K. Koike, H. Yotsuyanagi, 2007, Hepatology research : the official journal of the Japan Society of Hepatology.

Influence of Prior HIV-1 Infection on the Development of Chronic Hepatitis B Infection

S. Oka, N. Tachikawa, H. Gatanaga, 2000, European Journal of Clinical Microbiology and Infectious Diseases.

Blunted fetal growth by tenofovir in late pregnancy.

S. Oka, H. Gatanaga, Y. Kikuchi, 2012, AIDS.

Preemptive Therapy Prevents Cytomegalovirus End-Organ Disease in Treatment-Naïve Patients with Advanced HIV-1 Infection in the HAART Era

S. Oka, K. Tsukada, H. Gatanaga, 2013, PloS one.

High Plasma Concentrations of Zidovudine (AZT) Do Not Parallel Intracellular Concentrations of AZT-Triphosphates in Infants During Prevention of Mother-to-Child HIV-1 Transmission

S. Oka, H. Gatanaga, Y. Kikuchi, 2016, Journal of acquired immune deficiency syndromes.

Impact of Immune Reconstitution-Induced Hepatic Flare on Hepatitis B Surface Antigen Loss in Hepatitis B Virus/Human Immunodeficiency Virus-1 Coinfected Patients

T. Kawaguchi, S. Oka, M. Sugiyama, 2020, The Journal of Infectious Diseases.

Influence of human immunodeficiency virus type 1 infection on acute hepatitis A virus infection.

S. Oka, N. Tachikawa, M. Daikoku, 2002, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Sustained cytomegalovirus-specific CD4+ T cell response associated with prevention of recurrence of cytomegalovirus retinitis without secondary prophylaxis after highly active antiretroviral therapy in patients with AIDS.

S. Oka, N. Tachikawa, K. Teruya, 2001, AIDS research and human retroviruses.

Acute Hepatitis C in HIV-1 Infected Japanese Cohort: Single Center Retrospective Cohort Study

S. Oka, Koji Watanabe, K. Tsukada, 2014, PloS one.

Assessment of antigenemia assay for the diagnosis of cytomegalovirus gastrointestinal diseases in HIV-infected patients.

H. Yazaki, S. Oka, J. Akiyama, 2013, AIDS patient care and STDs.

Successful absorption of antiretroviral drugs after gastrojejunal bypass surgery following failure of therapy through a jejunal tube.

S. Oka, Koji Watanabe, K. Teruya, 2009, Internal medicine.

Clinical and radiological features of Pneumocystis pneumonia in patients with rheumatoid arthritis, in comparison with methotrexate pneumonitis and Pneumocystis pneumonia in acquired immunodeficiency syndrome: a multicenter study.

T. Johkoh, N. Kamatani, K. Tateda, 2008, Internal medicine.

Epstein-Barr viral load in cerebrospinal fluid as a diagnostic marker of central nervous system involvement of AIDS-related lymphoma.

S. Oka, H. Gatanaga, J. Tanuma, 2013, Internal medicine.

Performance of an enzyme-linked immunosorbent-based serological assay for Entamoeba histolytica: Comparison with an indirect immunofluorescence assay using stored frozen samples.

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2021, Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy.

Utility of the Rapid Antigen Detection Test E. histolytica Quik Chek for the Diagnosis of Entamoeba histolytica Infection in Nonendemic Situations

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2020, Journal of Clinical Microbiology.

Clinical Features and Gut Microbiome of Asymptomatic Entamoeba histolytica Infection

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2020, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Increases in Entamoeba histolytica Antibody–Positive Rates in Human Immunodeficiency Virus–Infected and Noninfected Patients in Japan: A 10-Year Hospital-Based Study of 3,514 Patients

S. Oka, J. Akiyama, Yasuaki Yanagawa, 2016, The American journal of tropical medicine and hygiene.

Clinical significance of high anti-entamoeba histolytica antibody titer in asymptomatic HIV-1-infected individuals.

S. Oka, Koji Watanabe, H. Gatanaga, 2014, The Journal of infectious diseases.

Primary HIV infection with acute transverse myelitis.

N. Arai, S. Oka, Koji Watanabe, 2011, Internal medicine.

Higher seroprevalence of Entamoeba histolytica than that of HIV-1 at a voluntary counselling and testing centre in Tokyo

S. Oka, K. Yokoyama, Yasuaki Yanagawa, 2019, bioRxiv.

Asymptomatic intestinal amebiasis in Japanese HIV-1-infected individuals.

S. Oka, Koji Watanabe, H. Gatanaga, 2014, The American journal of tropical medicine and hygiene.

Seroprevalence of Entamoeba histolytica at a voluntary counselling and testing centre in Tokyo: a cross-sectional study

S. Oka, K. Yokoyama, Yasuaki Yanagawa, 2020, BMJ Open.

Epstein-Barr virus associated colitis in an HIV-infected patient.

S. Oka, K. Teruya, Y. Kikuchi, 2012, AIDS.

Short Report: Asymptomatic Intestinal Amebiasis in Japanese HIV-1 – Infected Individuals

S. Oka, Koji Watanabe, H. Gatanaga, 2014 .

Comparison of 18F-FDG PET/CT and 67Ga-SPECT for the diagnosis of fever of unknown origin: a multicenter prospective study in Japan

S. Baba, M. Kameyama, J. Hatazawa, 2020, Annals of Nuclear Medicine.

HLA-A*2402-restricted HIV-1-specific cytotoxic T lymphocytes and escape mutation after ART with structured treatment interruptions.

S. Oka, N. Tachikawa, H. Gatanaga, 2008, Microbes and infection.

Emergence of CXCR4-tropic HIV-1 variants followed by rapid disease progression in hemophiliac slow progressors

S. Oka, H. Gatanaga, Y. Kikuchi, 2017, PloS one.

Incomplete Recovery of CD4 Cell Count, CD4 Percentage, and CD4/CD8 Ratio in Patients With Human Immunodeficiency Virus Infection and Suppressed Viremia During Long-term Antiretroviral Therapy

S. Oka, Noriko Tanaka, H. Gatanaga, 2018, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Accumulation of lopinavir resistance-associated mutations over 3 years follow-up of patients on highly active antiretroviral therapy: implication in salvage therapy.

S. Oka, N. Tachikawa, A. Hachiya, 2001, AIDS.

Increased risk of non-AIDS-defining cancers in Asian HIV-infected patients: a long-term cohort study

S. Oka, J. Akiyama, R. Niikura, 2018, BMC Cancer.

Prevalence of Anal Human Papillomavirus Infection and Risk Factors among HIV-positive Patients in Tokyo, Japan

S. Oka, K. Tadokoro, J. Akiyama, 2015, PloS one.

Increased risk of non-AIDS-defining cancers in Asian HIV-infected patients: a long-term cohort study

S. Oka, J. Akiyama, R. Niikura, 2018, BMC Cancer.

Full-Genome Analysis of Hepatitis C Virus in Japanese and Non-Japanese Patients Coinfected With HIV-1 in Tokyo

S. Oka, M. Sugiyama, M. Mizokami, 2019, Journal of acquired immune deficiency syndromes.

Whole-body 18F-fluorodeoxyglucose positron emission tomography/computed tomography images before and after chemotherapy for Kaposi sarcoma and highly active antiretrovirus therapy

K. Ohtomo, K. Hasuo, K. Kubota, 2010, Japanese Journal of Radiology.

Full‐genome analysis of hepatitis C virus in HIV‐coinfected hemophiliac Japanese patients

S. Oka, M. Sugiyama, M. Mizokami, 2020, Hepatology research : the official journal of the Japan Society of Hepatology.

Mortality and causes of death in people living with HIV in the era of combination antiretroviral therapy compared with the general population in Japan

S. Oka, K. Tsukada, H. Gatanaga, 2020, AIDS.

Traditional but Not HIV-Related Factors Are Associated with Nonalcoholic Fatty Liver Disease in Asian Patients with HIV-1 Infection

S. Oka, T. Shimbo, Y. Nozaki, 2014, PloS one.

Clinical application of the polymerase chain reaction for a rapid diagnosis of Mycobacterium tuberculosis infection.

S. Oka, Y. Kikuchi, K. Shimada, 1992, Internal medicine.

[A case of human-immunodeficiency virus infection related Mycobacterium tuberculosis with atypical clinical features].

S. Oka, Y. Kikuchi, K. Shimada, 1991, Kansenshogaku zasshi. The Journal of the Japanese Association for Infectious Diseases.

Effectiveness of doxycycline 100 mg twice daily for 7 days and azithromycin 1 g single dose for the treatment of rectal Chlamydia trachomatis infection among men who have sex with men.

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2020, The Journal of antimicrobial chemotherapy.

Modified self-obtained pooled sampling to screen for Chlamydia trachomatis and Neisseria gonorrhoeae infections in men who have sex with men

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2020, Sexually Transmitted Infections.

High-dose oral amoxicillin plus probenecid is highly effective for syphilis in patients with HIV infection.

S. Oka, H. Gatanaga, K. Teruya, 2015, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Usefulness of Automated Latex Turbidimetric Rapid Plasma Reagin Test for Diagnosis and Evaluation of Treatment Response in Syphilis in Comparison with Manual Card Test: a Prospective Cohort Study

S. Oka, H. Gatanaga, K. Teruya, 2018, Journal of Clinical Microbiology.

Prognosis of ocular syphilis in patients infected with HIV in the antiretroviral therapy era

S. Oka, H. Gatanaga, K. Teruya, 2016, Sexually Transmitted Infections.

Cerebral Syphilitic Gumma within 5 Months of Syphilis in HIV-Infected Patient

S. Oka, H. Gatanaga, K. Teruya, 2016, Emerging infectious diseases.

Cumulative exposure of TDF is associated with kidney tubulopathy whether it is currently used or discontinued

S. Oka, H. Gatanaga, Y. Kikuchi, 2017, AIDS.

Association of age and time of disease with HIV-associated neurocognitive disorders: a Japanese nationwide multicenter study

S. Oka, Y. Kikuchi, M. Takano, 2017, Journal of NeuroVirology.

Decrease in Epstein-Barr virus-positive AIDS-related lymphoma in the era of highly active antiretroviral therapy.

S. Oka, S. Mori, N. Funata, 2006, Microbes and infection.

Brain magnetic resonance imaging screening is not useful for HIV-1-infected patients without neurological symptoms.

K. Hasuo, S. Oka, T. Tajima, 2014, AIDS research and human retroviruses.

Clinical symptoms and courses of primary HIV-1 infection in recent years in Japan.

H. Yazaki, S. Oka, K. Tsukada, 2011, Internal medicine.

The First Reported Case of Bordetella pertussis Bacteremia in a Patient With Human Immunodeficiency Virus Infection

S. Oka, Yasuaki Yanagawa, K. Teruya, 2022, Open forum infectious diseases.

The prevalence of opportunistic infections and malignancies in autopsied patients with human immunodeficiency virus infection in Japan

Y. Kodama, S. Oka, T. Hishima, 2014, BMC Infectious Diseases.

HIV-1 infection, but not syphilis or HBV infection, is a strong risk factor for anorectal condyloma in Asian population: a prospective colonoscopy screening study.

H. Yazaki, S. Oka, M. Mizokami, 2015, International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases.

Two cases of long lasting bacteremia due to Mycobacterium avium complex despite new macrolides-containing regimens in patients with acquired immunodeficiency syndrome.

S. Oka, N. Tachikawa, K. Teruya, 2001, Internal medicine.

Drug-induced acute interstitial nephritis mimicking acute tubular necrosis after initiation of tenofovir-containing antiretroviral therapy in patient with HIV-1 infection.

H. Yazaki, S. Oka, H. Gatanaga, 2012, Internal medicine.

Anal human papillomavirus infection and its relationship with abnormal anal cytology among MSM with or without HIV infection in Japan

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2021, Scientific Reports.

Serious bradyarrhythmia that was possibly induced by lopinavir-ritonavir in 2 patients with acquired immunodeficiency syndrome.

S. Oka, Y. Kikuchi, A. Ishizaki, 2002, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Hepatitis A virus outbreak; a possible indicator of high risk sexual behavior among HIV-1 infected homosexual men.

S. Oka, N. Tachikawa, K. Teruya, 1999, Japanese journal of infectious diseases.

Clinical importance of hyper-beta-2-microglobulinuria in patients with HIV-1 infection on tenofovir-containing antiretroviral therapy.

S. Oka, K. Tsukada, H. Gatanaga, 2014, Journal of acquired immune deficiency syndromes.

Detection of HIV type 1 load by the Roche Cobas TaqMan assay in patients with viral loads previously undetectable by the Roche Cobas Amplicor Monitor.

H. Yazaki, S. Oka, K. Tsukada, 2009, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Idiopathic oropharyngeal and esophageal ulcers related to HIV infection successfully treated with antiretroviral therapy alone.

S. Oka, H. Gatanaga, K. Teruya, 2013, Internal medicine.

Antiretroviral therapy alone resulted in successful resolution of large idiopathic esophageal ulcers in a patient with acute retroviral syndrome.

S. Oka, Koji Watanabe, K. Tsukada, 2011, AIDS.

What Triggers a Diagnosis of HIV Infection in the Tokyo Metropolitan Area? Implications for Preventing the Spread of HIV Infection in Japan

S. Oka, H. Gatanaga, Y. Kikuchi, 2015, PloS one.

Long-term use of protease inhibitors is associated with bone mineral density loss.

H. Yazaki, S. Oka, Koji Watanabe, 2014, AIDS research and human retroviruses.

Substantially Higher and Earlier Occurrence of Anti‐Tuberculosis Drug‐Related Adverse Reactions in HIV Coinfected Tuberculosis Patients: A Matched‐Cohort Study

S. Oka, M. Kaku, H. Gatanaga, 2017, AIDS patient care and STDs.

Combination of Clindamycin and Azithromycin as Alternative Treatment for Toxoplasma gondii Encephalitis

S. Oka, K. Teruya, Y. Kikuchi, 2019, Emerging infectious diseases.

Emergence of community-associated methicillin-resistant Staphylococcus aureus ΨUSA300 among Japanese people with HIV, resulted from stepwise mutations in 2010s

S. Oka, T. Baba, Yukie Uehara, 2023, Scientific reports.

Enteral entrance of Mycobacterium avium in patients with disseminated mycobacterial disease.

S. Oka, K. Teruya, Y. Kikuchi, 2013, International Journal of Mycobacteriology.

Usefulness of F-18 FDG PET/CT in a case of Kaposi sarcoma with an unexpected bone lesion.

S. Oka, K. Kubota, K. Teruya, 2011, Clinical Nuclear Medicine.

Emergence of raltegravir-resistant HIV-1 in the central nervous system

S. Oka, K. Tsukada, H. Gatanaga, 2010, International journal of STD & AIDS.

Effect of tenofovir-based HIV pre-exposure prophylaxis against HBV infection in men who have sex with men

S. Oka, Yasuaki Yanagawa, Koji Watanabe, 2023, Hepatology.

Prevalence and factors associated with chronic kidney disease and end-stage renal disease in HIV-1-infected Asian patients in Tokyo

S. Oka, K. Tsukada, H. Gatanaga, 2017, Scientific Reports.

Primary nelfinavir (NFV)-associated resistance mutations during a follow-up period of 108 weeks in protease inhibitor naïve patients treated with NFV-containing regimens in an HIV clinic cohort.

S. Oka, N. Tachikawa, K. Teruya, 2003, Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology.

Incidence and Risk Factors for Incident Syphilis among HIV-1-Infected Men Who Have Sex with Men in a Large Urban HIV Clinic in Tokyo, 2008−2015

H. Yazaki, S. Oka, S. Shibata, 2016, PloS one.

Antiretroviral therapy for treatment-naïve chronic HIV-1 infection with an axonal variant of Guillain-Barré syndrome positive for anti-ganglioside antibody: a case report.

S. Oka, K. Tsukada, H. Gatanaga, 2011, Internal medicine.

Pharmacokinetics of Bictegravir in Older Japanese People Living with HIV-1

Hieu Tran Trung, S. Oka, Yasuaki Yanagawa, 2023, Microbiology spectrum.

Role of bone marrow cells in autoantibody production and lymphoproliferation in the novel mutant strain of mice, CBA/KIJms‐lprcg/lprcg

T. Katagiri, H. Nariuchi, Y. Kikuchi, 1991, European journal of immunology.

Various associations of aging and long-term HIV infection with different neurocognitive functions: detailed analysis of a Japanese nationwide multicenter study

H. Yazaki, S. Oka, Yasuaki Yanagawa, 2019, Journal of NeuroVirology.

Structure of the Bombyx mori fibroin light-chain-encoding gene: upstream sequence elements common to the light and heavy chain.

K. Yamaguchi, Y. Kikuchi, S. Suzuki, 1992, Gene.

Primary structure of the silk fibroin light chain determined by cDNA sequencing and peptide analysis.

T. Takagi, K. Yamaguchi, Y. Kikuchi, 1989, Journal of molecular biology.

Influence of human immunodeficiency virus type 1 infection on acute hepatitis A virus infection.

S. Oka, N. Tachikawa, M. Daikoku, 2002, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Comparison of clinical and radiological features of pneumocystis pneumonia between malignancy cases and acquired immunodeficiency syndrome cases: a multicenter study.

T. Johkoh, K. Tateda, S. Tasaka, 2010, Internal medicine.

High incidence of renal stones among HIV-infected patients on ritonavir-boosted atazanavir than in those receiving other protease inhibitor-containing antiretroviral therapy.

S. Oka, Koji Watanabe, K. Tsukada, 2012, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Long-term weight gain after initiating combination antiretroviral therapy in treatment-naïve Asian people living with human immunodeficiency virus.

S. Oka, H. Gatanaga, Y. Kikuchi, 2021, International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases.