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Kobayashi M, Matanock A, Xing W, Adih WK, Li J, Gierke R, Almendares O, Reingold A, Alden N, Petit S, Farley MM, Harrison LH, Holtzman C, Baumbach J, Thomas A, Schaffner W, McGee L, Pilishvili T. Impact of 13-Valent Pneumococcal Conjugate Vaccine on Invasive Pneumococcal Disease Among Adults With HIV-United States, 2008-2018. J Acquir Immune Defic Syndr 2022; 90:6-14. [PMID: 35384920 PMCID: PMC9009407 DOI: 10.1097/qai.0000000000002916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 01/04/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND People with HIV (PWH) are at increased risk for invasive pneumococcal disease (IPD). Thirteen-valent pneumococcal conjugate vaccine (PCV13) was recommended for use in US children in 2010 and for PWH aged 19 years or older in 2012. We evaluated the population-level impact of PCV13 on IPD among PWH and non-PWH aged 19 years or older. METHODS We identified IPD cases from 2008 to 2018 through the Active Bacterial Core surveillance platform. We estimated IPD incidence using the National HIV Surveillance System and US Census Bureau data. We measured percent changes in IPD incidence from 2008 to 2009 to 2017-2018 by HIV status, age group, and vaccine serotype group, including serotypes in recently licensed 15-valent (PCV15) and 20-valent (PCV20) PCVs. RESULTS In 2008-2009 and 2017-2018, 8.4% (552/6548) and 8.0% (416/5169) of adult IPD cases were among PWH, respectively. Compared with non-PWH, a larger proportion of IPD cases among PWH were in adults aged 19-64 years (94.7%-97.4% vs. 56.0%-60.1%) and non-Hispanic Black people (62.5%-73.0% vs. 16.7%-19.2%). Overall and PCV13-type IPD incidence in PWH declined by 40.3% (95% confidence interval: -47.7 to -32.3) and 72.5% (95% confidence interval: -78.8 to -65.6), respectively. In 2017-2018, IPD incidence was 16.8 (overall) and 12.6 (PCV13 type) times higher in PWH compared with non-PWH; PCV13, PCV15/non-PCV13, and PCV20/non-PCV15 serotypes comprised 21.5%, 11.2%, and 16.5% of IPD in PWH, respectively. CONCLUSIONS Despite reductions post-PCV13 introduction, IPD incidence among PWH remained substantially higher than among non-PWH. Higher-valent PCVs provide opportunities to reduce remaining IPD burden in PWH.
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Affiliation(s)
- Miwako Kobayashi
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
| | - Almea Matanock
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
| | - Wei Xing
- Weems Design Studio Inc, Decatur, GA
| | - William K Adih
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, GA
| | - Jianmin Li
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, GA
| | - Ryan Gierke
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
| | - Olivia Almendares
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
| | - Arthur Reingold
- Berkeley School of Public Health, University of California, Berkeley, CA
| | - Nisha Alden
- Colorado Department of Public Health and Environment, Denver, CO
| | - Susan Petit
- Connecticut Department of Public Health, Hartford, CT
| | - Monica M Farley
- Department of Medicine, Emory University School of Medicine and the Atlanta VA Medical Center, GA
| | - Lee H Harrison
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | | | | | - Ann Thomas
- Oregon Department of Human Services, Portland, OR; and
| | - William Schaffner
- Department of Health Policy, Vanderbilt University School of Medicine, Nashville, TN
| | - Lesley McGee
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
| | - Tamara Pilishvili
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA
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Teklu SW, Rao KP. HIV/AIDS-Pneumonia Codynamics Model Analysis with Vaccination and Treatment. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2022; 2022:3105734. [PMID: 35069778 PMCID: PMC8767370 DOI: 10.1155/2022/3105734] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/09/2021] [Indexed: 11/28/2022]
Abstract
In this paper, we proposed and analyzed a realistic compartmental mathematical model on the spread and control of HIV/AIDS-pneumonia coepidemic incorporating pneumonia vaccination and treatment for both infections at each infection stage in a population. The model exhibits six equilibriums: HIV/AIDS only disease-free, pneumonia only disease-free, HIV/AIDS-pneumonia coepidemic disease-free, HIV/AIDS only endemic, pneumonia only endemic, and HIV/AIDS-pneumonia coepidemic endemic equilibriums. The HIV/AIDS only submodel has a globally asymptotically stable disease-free equilibrium if ℛ 1 < 1. Using center manifold theory, we have verified that both the pneumonia only submodel and the HIV/AIDS-pneumonia coepidemic model undergo backward bifurcations whenever ℛ 2 < 1 and ℛ 3 = max{ℛ 1, ℛ 2} < 1, respectively. Thus, for pneumonia infection and HIV/AIDS-pneumonia coinfection, the requirement of the basic reproduction numbers to be less than one, even though necessary, may not be sufficient to completely eliminate the disease. Our sensitivity analysis results demonstrate that the pneumonia disease transmission rate β 2 and the HIV/AIDS transmission rate β 1 play an important role to change the qualitative dynamics of HIV/AIDS and pneumonia coinfection. The pneumonia infection transmission rate β 2 gives rises to the possibility of backward bifurcation for HIV/AIDS and pneumonia coinfection if ℛ 3 = max{ℛ 1, ℛ 2} < 1, and hence, the existence of multiple endemic equilibria some of which are stable and others are unstable. Using standard data from different literatures, our results show that the complete HIV/AIDS and pneumonia coinfection model reproduction number is ℛ 3 = max{ℛ 1, ℛ 2} = max{1.386, 9.69 } = 9.69 at β 1 = 2 and β 2 = 0.2 which shows that the disease spreads throughout the community. Finally, our numerical simulations show that pneumonia vaccination and treatment against disease have the effect of decreasing pneumonia and coepidemic disease expansion and reducing the progression rate of HIV infection to the AIDS stage.
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Lemma M, Bekele Y, Petkov S, Hägglund M, Petros B, Aseffa A, Howe R, Chiodi F. Streptococcus pneumoniae Nasopharyngeal Carriage among PCV-10-Vaccinated HIV-1-Infected Children with Maintained Serological Memory in Ethiopia. Pathogens 2020; 9:pathogens9030159. [PMID: 32106620 PMCID: PMC7157605 DOI: 10.3390/pathogens9030159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/19/2020] [Accepted: 02/23/2020] [Indexed: 11/16/2022] Open
Abstract
Streptococcus pneumoniae (S. pneumoniae) vaccines have substantially reduced the burden of invasive pneumococcal diseases (IPDs) worldwide. Despite high coverage with S. pneumoniae vaccination, upper-respiratory-tract colonization by S. pneumoniae is still common. We assessed maintenance of serological responses to S. pneumoniae serotypes included in PCV-10 by ELISA in HIV-1-infected children (n = 50) and age-matched controls (n = 50) in Ethiopia. We isolated S. pneumoniae in nasopharyngeal swabs and determined S. pneumoniae serotype by whole genome sequencing (WGS). Comparable levels of S. pneumoniae serotype-specific IgG concentrations were detected in plasma of HIV-1-infected children and matched controls, with geometric mean concentrations (GMCs) consistently higher than the protective threshold for PCV-10 serotypes of 0.35 μg/mL. We isolated S. pneumoniae from 38 (out of 97) nasopharyngeal swabs, 25 from HIV-1-infected children and 13 from controls. WGS based serotyping revealed 22 known S. pneumoniae serotypes and 2 nontypeable (NT) isolates. Non-PCV-10 serotypes represented >90% of isolates. We showed that HIV-1-infected children and matched controls in Ethiopia carry a level of maintained serological memory to PCV-10 considered protective for IPDs. We identified a higher proportion of nasopharyngeal carriage with highly pathogenic S. pneumoniae non-PCV strains among HIV-1-infected children compared to controls.
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Affiliation(s)
- Mahlet Lemma
- Department of Microbiology, Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Solnavägen 9, 17165 Solna, Sweden
- Armauer Hansen Research Institute, Jimma Road, ALERT compound P.O. Box 1005, Addis Ababa, Ethiopia
- Department of Microbial, Cellular and Molecular Biology, Addis Ababa University, Arat Kilo Campus, Addis Ababa, Ethiopia
| | - Yonas Bekele
- Department of Microbiology, Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Solnavägen 9, 17165 Solna, Sweden
| | - Stefan Petkov
- Department of Microbiology, Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Solnavägen 9, 17165 Solna, Sweden
| | - Moa Hägglund
- Science for Life Laboratory, Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, 17165 Solna, Sweden
| | - Beyene Petros
- Department of Microbial, Cellular and Molecular Biology, Addis Ababa University, Arat Kilo Campus, Addis Ababa, Ethiopia
| | - Abraham Aseffa
- Armauer Hansen Research Institute, Jimma Road, ALERT compound P.O. Box 1005, Addis Ababa, Ethiopia
| | - Rawleigh Howe
- Armauer Hansen Research Institute, Jimma Road, ALERT compound P.O. Box 1005, Addis Ababa, Ethiopia
| | - Francesca Chiodi
- Department of Microbiology, Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Solnavägen 9, 17165 Solna, Sweden
- Correspondence:
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Garmpi A, Damaskos C, Garmpis N, Patsouras A, Savvanis S, Gravvanis N, Diamantis E. Pneumococcal Vaccination Strategies Among HIV-infected Adult Patients: A Review of the Literature. In Vivo 2020; 33:1425-1430. [PMID: 31471388 DOI: 10.21873/invivo.11620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/21/2019] [Accepted: 07/22/2019] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM Streptococcus pneumoniae is the leading cause of bacterial pneumonia and an important cause of invasive disease. Despite the antiretroviral therapies, adults infected with human immunodeficiency virus (HIV) are at particular risk for invasive pneumococcal disease (IPD). The purpose of this study was to report the efficacy of the strategies currently being used in pneumococcal vaccination for HIV-infected adults. MATERIALS AND METHODS A literature search was performed through electronic databases, for original articles in English, from years 2000 to 2019. Clinical trials controlled or randomized, and cohort studies were included. RESULTS While 23-valent pneumococcal polysaccharide vaccine (PPV23) is recommended for immunocompromised patients, it has been reported that it is less suitable for HIV-infected patients. Recent guidelines have added pneumococcal conjugate vaccine (PCV) to the list of recommended vaccines. CONCLUSION Further studies are needed to determine the optimal vaccines and intervals for subsequent revaccinations during the lifetime.
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Affiliation(s)
- Anna Garmpi
- Internal Medicine Department, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Christos Damaskos
- Second Department of Propedeutic Surgery, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikolaos Garmpis
- Second Department of Propedeutic Surgery, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Spyridon Savvanis
- Department of Internal Medicine, Elpis General Hospital, Athens, Greece
| | | | - Evangelos Diamantis
- Department of Endocrinology and Diabetes Center, G. Gennimatas General Hospital, Athens, Greece
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Chang L, Lim BCW, Flaherty GT, Torresi J. Travel vaccination recommendations and infection risk in HIV-positive travellers. J Travel Med 2019; 26:5486056. [PMID: 31066446 DOI: 10.1093/jtm/taz034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND With the advent of highly active antiretroviral drugs for the treatment of human immunodeficiency virus (HIV) it has become possible for people with HIV to travel to destinations that may place them at risk of a number of infectious diseases. Prevention of infections by vaccination is therefore of paramount importance for these travellers. However, vaccine responsiveness in HIV-positive individuals is not infrequently reduced compared to HIV-negative individuals. An understanding of the expected immune responses to vaccines in HIV-positive travellers is therefore important in planning the best approach to a pretravel consultation. METHODS A PubMed search was performed on HIV or acquired immune deficiency syndrome together with a search for specific vaccines. Review of the literature was performed to develop recommendations on vaccinations for HIV-positive travellers to high-risk destinations. RESULTS The immune responses to several vaccines are reduced in HIV-positive people. In the case of vaccines for hepatitis A, hepatitis B, influenza, pneumococcus, meningococcus and yellow fever there is a good body of data in the literature showing reduced immune responsiveness and also to help guide appropriate vaccination strategies. For other vaccines like Japanese encephalitis, rabies, typhoid fever, polio and cholera the data are not as robust; however, it is still possible to gain some understanding of the reduced responses seen with these vaccines. CONCLUSION This review provides a summary of the immunological responses to commonly used vaccines for the HIV-positive travellers. This information will help guide travel medicine practitioners in making decisions about vaccination and boosting of travellers with HIV.
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Affiliation(s)
- Lisa Chang
- Department of Microbiology, Dorevitch Pathology, Melbourne, Victoria, Australia
| | - Bryan Chang Wei Lim
- School of Medicine, National University of Ireland, Galway, Ireland.,School of Medicine, International Medical University, Kuala Lumpur, Malaysia
| | - Gerard T Flaherty
- School of Medicine, National University of Ireland, Galway, Ireland.,School of Medicine, International Medical University, Kuala Lumpur, Malaysia
| | - Joseph Torresi
- Department of Microbiology and Immunology, Peter Doherty Institute, The University of Melbourne, Parkville, Victoria, Australia
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Cillóniz C, Ielpo A, Torres A. Treating HIV-Positive/Non-AIDS Patients for Community-Acquired Pneumonia with ART. Curr Infect Dis Rep 2018; 20:46. [PMID: 30203191 DOI: 10.1007/s11908-018-0652-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
PURPOSE OF REVIEW This article reviews the most recent publications on community-acquired pneumonia (CAP) in the HIV-infected population on antiretroviral therapy (ART), focusing on epidemiology, prognostic factors, etiology, and antimicrobial therapy. The data discussed here were mainly obtained from a non-systematic review using Medline and references from relevant articles. RECENT FINDINGS CAP remains a major cause of morbidity and mortality among HIV-infected patients and incurs high health costs despite the introduction of ART. HIV-infected patients are generally known to be more susceptible to bacterial pneumonia. Streptococcus pneumoniae is the most frequently reported pathogen in HIV-infected patients on ART, who present a higher rate of bacteremia than non-HIV-infected patients. Several studies have also examined microbial etiology and prognostic factors of CAP in HIV-infected patients on ART. Despite the high rate of bacterial pneumonia in these patients, mortality rates are not higher than in patients without HIV infection.
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Affiliation(s)
- Catia Cillóniz
- Department of Pulmonary Medicine, Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB) - SGR 911- Ciber de Enfermedades Respiratorias (Ciberes), C/ Villarroel 170, 08036, Barcelona, Spain.
| | - Antonella Ielpo
- Department of Medicine and Surgery, Respiratory Disease, and Lung Function Unit, University of Parma, Parma, Italy
| | - Antoni Torres
- Department of Pulmonary Medicine, Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB) - SGR 911- Ciber de Enfermedades Respiratorias (Ciberes), C/ Villarroel 170, 08036, Barcelona, Spain.
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Cillóniz C, García-Vidal C, Moreno A, Miro JM, Torres A. Community-acquired bacterial pneumonia in adult HIV-infected patients. Expert Rev Anti Infect Ther 2018; 16:579-588. [PMID: 29976111 DOI: 10.1080/14787210.2018.1495560] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Despite active antiretroviral therapy (ART), community-acquired pneumonia (CAP) remains a major cause of morbidity and mortality among human immunodeficiency virus (HIV)-infected patients and incurs high health costs. Areas covered: This article reviews the most recent publications on bacterial CAP in the HIV-infected population, focusing on epidemiology, prognostic factors, microbial etiology, therapy, and prevention. The data discussed here were mainly obtained from a non-systematic review using Medline, and references from relevant articles. Expert commentary: HIV-infected patients are more susceptible to bacterial CAP. Although ART improves their immune response and has reduced CAP incidence, these patients continue to present increased risk of pneumonia in part because they show altered immunity and because immune activation persists. The risk of CAP in HIV-infected patients and the probability of polymicrobial or atypical infections are inversely associated with the CD4 cell count. Mortality in HIV-infected patients with CAP ranges from 6% to 15% but in well-controlled HIV-infected patients on ART the mortality is low and similar to that seen in HIV-negative individuals. Vaccination and smoking cessation are the two most important preventive strategies for bacterial CAP in well-controlled HIV-infected patients on ART.
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Affiliation(s)
- Catia Cillóniz
- a Department of Pulmonary Medicine Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) , University of Barcelona (UB) - SGR 911- Ciber de Enfermedades Respiratorias (Ciberes) , Barcelona , Spain
| | - Carolina García-Vidal
- b Infectious Diseases Service, Hospital Clinic-IDIBAPS , University of Barcelona , Barcelona , Spain
| | - Asunción Moreno
- b Infectious Diseases Service, Hospital Clinic-IDIBAPS , University of Barcelona , Barcelona , Spain
| | - José M Miro
- b Infectious Diseases Service, Hospital Clinic-IDIBAPS , University of Barcelona , Barcelona , Spain
| | - Antoni Torres
- a Department of Pulmonary Medicine Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) , University of Barcelona (UB) - SGR 911- Ciber de Enfermedades Respiratorias (Ciberes) , Barcelona , Spain
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Huang H, Qian X, Pan R, Shen L, Liang S, Wang F, Zhang P, Shen H, Chen ZW. 23-valent pneumococcal polysaccharide vaccine elicits hierarchical antibody and cellular responses in healthy and tuberculosis-cured elderly, and HIV-1-infected subjects. Clin Immunol 2018; 193:1-9. [PMID: 29753126 DOI: 10.1016/j.clim.2018.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 05/06/2018] [Accepted: 05/09/2018] [Indexed: 12/14/2022]
Abstract
The PPV23 immunizes healthy elderly and other high-risk populations against pneumococcal disease. Immune mechanisms whereby these populations differently mount antibody(Ab) and cellular responses to PPV23 vaccination remain unknown. Here, healthy elderly, those elderly with prior tuberculosis-cured history (TB-cured), and HIV-infected humans were vaccinated with PPV23, and assessed for opsonophagocytic Ab responses and potential cellular mechanisms. PPV23 vaccination elicited hierarchical responses of opsonophagocytic Ab. PPV23-elicited Ab titers were highest in healthy elderly, significantly lower in TB-cured elderly and lowest in HIV-infected subjects. Mechanistically, high PPV23-elicited Ab titers in healthy elderly were associated with increases in CD19 + CD69+ cells and CD19 + CD138 + plasma cells. Surprisingly, TB-cured elderly failed to show PPV23-induced increases in these cells. While HIV-infected subjects showed a depressed CD19 + CD69+ cellular response, PPV23 vaccination uncovered HIV-related over-reactive increases in CD19 + CD138 + cells. For the first time, we demonstrate that PPV23-elicted opsonophagocytic Ab titers correlate with different cellular responses in healthy, TB-cured and HIV statuses.
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Affiliation(s)
- Huichang Huang
- Clinic and Research Center of Tuberculosis, Shanghai Key Lab of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China; Unit of Anti-tuberculosis Immunity, CAS Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaohua Qian
- Hongkou Center for Disease Control and Prevention of Shanghai, Shanghai 200082, China
| | - Rong Pan
- Hongkou Center for Disease Control and Prevention of Shanghai, Shanghai 200082, China
| | - Ling Shen
- Department of Microbiology and Immunology, Center for Primate Biomedical Research, University of Illinois College Medicine, Chicago, IL 60612, United States
| | - Shanshan Liang
- Unit of Anti-tuberculosis Immunity, CAS Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai 200031, China
| | - Feifei Wang
- Department of Medical Microbiology and Parasitology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Peng Zhang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, 200433, China.
| | - Hongbo Shen
- Clinic and Research Center of Tuberculosis, Shanghai Key Lab of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China; Unit of Anti-tuberculosis Immunity, CAS Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai 200031, China.
| | - Zheng W Chen
- Department of Microbiology and Immunology, Center for Primate Biomedical Research, University of Illinois College Medicine, Chicago, IL 60612, United States
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