1
|
Pittet LF, Gualtieri R, Verolet CM, L'Huillier AG, Wildhaber BE, McLin VA, Posfay-Barbe KM. Long-term persistence of seroprotection against measles following measles-mumps-rubella vaccination administered before and after pediatric liver transplantation. Am J Transplant 2024:S1600-6135(24)00440-4. [PMID: 39029873 DOI: 10.1016/j.ajt.2024.07.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 07/12/2024] [Accepted: 07/15/2024] [Indexed: 07/21/2024]
Abstract
Liver transplant (LT) recipients are susceptible to infections, including measles. Concerns about the safety and efficacy of live-attenuated vaccines, such as the measles-mumps-rubella (MMR) vaccine, have led to hesitancy among providers in administering them to immunocompromised patients. This 9-year interventional study assessed seroprotection against measles following MMR vaccination in pediatric LT recipients. Of 119 participants enrolled, 60 (50%) were seroprotected against measles after transplantation. Among the 59 non-seroprotected participants, 56 fulfilled safety criteria and received MMR vaccination with a seroprotection rate of 90% (95%CI 73-98%) after a first dose, 95% (95%CI 85-99%) after primary vaccination with 1 to 3 doses, comparable to non-immunocompromised populations. However, measles antibodies declined over time, suggesting the need for regular monitoring, and booster doses. Half of the vaccinees (26/53, 49%) subsequently lost seroprotection. Among them, 23 received additional doses of MMR, with high seroconversion rate. At their last follow up (median 6.1 years, IQR 3.0-8.1 after inclusion), 63% (95%CI 49-75%) of all vaccinees were seroprotected against measles. In conclusion, MMR vaccination in pediatric LT recipients offers seroprotection against measles, but long-term immunity should be monitored closely. CLINICAL TRIAL REGISTRATION: The trial is registered at the US National Institutes of Health (Clinicaltrials.gov) number NCT01770119.
Collapse
Affiliation(s)
- Laure F Pittet
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Department of Pediatrics, Gynecology and Obstetrics Division of General Pediatrics, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland; Centre for Vaccinology, Departments of Pathology-Immunology, University of Geneva, Geneva, Switzerland
| | - Renato Gualtieri
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Department of Pediatrics, Gynecology and Obstetrics Division of General Pediatrics, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Charlotte M Verolet
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Department of Pediatrics, Gynecology and Obstetrics Division of General Pediatrics, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Arnaud G L'Huillier
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Department of Pediatrics, Gynecology and Obstetrics Division of General Pediatrics, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Barbara E Wildhaber
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; University Center of Pediatric Surgery of Western Switzerland, Department of Pediatrics, Gynecology and Obstetrics, Swiss Pediatric Liver Center, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Pediatric Gastroenterology, Hepatology and Nutrition Unit, Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University of Geneva, Switzerland
| | - Klara M Posfay-Barbe
- Swiss Pediatric Liver Center, Geneva University Hospitals, Geneva, Switzerland; Department of Pediatrics, Gynecology and Obstetrics Division of General Pediatrics, Children's Hospital, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland.
| |
Collapse
|
2
|
Takeuchi J, Ozaki I, Hata K, Nozawa M, Fukushima K, Fukumori N, Imanaka M, Sakanishi Y, Shima M, Morimoto T. Mumps vaccination and immune status among Japanese university students: A multicenter cross-sectional study. J Public Health Res 2024; 13:22799036241246702. [PMID: 38694450 PMCID: PMC11062233 DOI: 10.1177/22799036241246702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 03/26/2024] [Indexed: 05/04/2024] Open
Abstract
Background During the mumps outbreak in Japan in 2016, 159,031 cases were reported. In a survey conducted in 2015, mumps vaccination rates for the first dose were 30%-40%. However, the rates for two or more doses were not determined. We assessed the mumps vaccination rates and mumps infection prevalence according to vaccine doses received. Design and methods This was a multicenter cross-sectional study. Students from three universities participated in 2019. Informed consent was obtained from the students and their guardians. The primary outcome was the prevalence of breakthrough mumps infection according to the number of doses of vaccine received. We collected data on past illnesses of vaccine-preventable diseases and vaccination history using a questionnaire, photocopies of the Maternal and Child Health Handbook from the guardians, and virus antibody titers from the universities' health centers. Results This study assessed 2004 eligible students and included 593 (29.6%); of these, 250 (42.7%) had a mumps infection history. Furthermore, 264 (44.6%), 31 (5.2%), and 2 (0.3%) students received the first, second, and third doses of mumps vaccine, respectively. The mumps seropositivity prevalence was 43.2% (n = 127), 36.7% (n = 97), 26.7% (n = 8), and 100% (n = 2) for the no-, first-, second-, and third-dose groups, respectively (p for trend = 0.09). The mumps infection prevalence rates were 69.8% (n = 203), 11.3% (n = 28), 3.9% (n = 1), and 0% for the no-, first-, second-, and third-dose groups, respectively. Conclusions Approximately 1 in 10 students who had received only one dose of mumps-containing vaccine had a breakthrough infection history.
Collapse
Affiliation(s)
- Jiro Takeuchi
- Institute for Clinical and Translational Science, Nara Medical University, Kashihara, Japan
| | - Iwata Ozaki
- Health Administration Center, Saga Medical School Faculty of Medicine, Saga University, Saga, Japan
| | - Kokichi Hata
- Health Service, The University of Shimane, Izumo, Japan
| | - Manami Nozawa
- Health Center, Hyogo Medical University, Nishinomiya, Japan
| | | | - Norio Fukumori
- Education and Research Center for Community Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Mie Imanaka
- Nursing and Dietetics Department, The University of Shimane, Izumo, Japan
| | - Yuta Sakanishi
- Sakanishi Internal Medicine and Pediatrics Clinic, Omuta, Japan
| | - Masayuki Shima
- Department of Public Health, Hyogo Medical University, Nishinomiya, Japan
| | - Takeshi Morimoto
- Department of Clinical Epidemiology, Hyogo Medical University, Nishinomiya, Japan
| |
Collapse
|
3
|
Keutler A, Lainka E, Posovszky C. Live-attenuated vaccination for measles, mumps, and rubella in pediatric liver transplantation. Pediatr Transplant 2024; 28:e14687. [PMID: 38317348 DOI: 10.1111/petr.14687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 12/11/2023] [Accepted: 12/18/2023] [Indexed: 02/07/2024]
Abstract
BACKGROUND Infections are a serious short- and long-term problem after pediatric organ transplantation. In immunocompromised patients, they can lead to transplant rejection or a severe course with a sometimes fatal outcome. Vaccination is an appropriate means of reducing morbidity and mortality caused by vaccine-preventable diseases. Unfortunately, due to the disease or its course, it is not always possible to establish adequate vaccine protection against live-attenuated viral vaccines (LAVVs) prior to transplantation. LAVVs such as measles, mumps, and rubella (MMR) are still contraindicated in solid organ transplant recipients receiving immunosuppressive therapy (IST), thus creating a dilemma. AIM This review discusses whether, when, and how live-attenuated MMR vaccines can be administered effectively and safely to pediatric liver transplant recipients based on the available data. MATERIAL AND METHODS We searched PubMed for literature on live-attenuated MMR vaccination in pediatric liver transplantation (LT). RESULTS Nine prospective observational studies and three retrospective case series were identified in which at least 833 doses of measles vaccine were administered to 716 liver transplant children receiving IST. In these selected patients, MMR vaccination was well tolerated and no serious adverse reactions to the vaccine were observed. In addition, an immune response to the vaccine was demonstrated in patients receiving IST. CONCLUSION Due to inadequate vaccine protection in this high-risk group, maximum efforts must be made to ensure full immunization. MMR vaccination could also be considered for unprotected patients after LT receiving IST following an individual risk assessment, as severe harm from live vaccines after liver transplantation has been reported only very rarely. To this end, it is important to establish standardized and simple criteria for the selection of suitable patients and the administration of the MMR vaccine to ensure safe use.
Collapse
Affiliation(s)
- Anne Keutler
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
| | - Elke Lainka
- University Children's Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Carsten Posovszky
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
- Gastroenterology and Nutrition, University Children's Hospital Zurich, Zurich, Switzerland
| |
Collapse
|
4
|
Kamei K. Live attenuated vaccines in patients receiving immunosuppressive agents. Pediatr Nephrol 2023; 38:3889-3900. [PMID: 37076756 PMCID: PMC10115603 DOI: 10.1007/s00467-023-05969-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/22/2023] [Accepted: 03/27/2023] [Indexed: 04/21/2023]
Abstract
The use of live attenuated vaccines in patients with immunosuppressive agents is contraindicated in package inserts and guidelines in Japan and other countries. However, patients receiving immunosuppressants have a high risk of infectious disease becoming severe, and the necessity to prevent infectious disease is high. To date, 2,091 vaccinations have been reported in 25 reports of live attenuated vaccines in people receiving immunosuppressants. Twenty-three patients (1.1%) became infected with the virus strain used in the vaccine, which was varicella virus in 21 patients. No reports have described life-threatening complications. A prospective study at the National Center for Child Health and Development conducted under certain immunological conditions (CD4 cell count ≥ 500/mm3, stimulation index of lymphocyte blast transformation by phytohemagglutinin (PHA) ≥ 101.6, serum immunoglobulin G ≥ 300 mg/dL) confirmed the serological effectiveness and safety. The evidence suggests that live attenuated vaccines can be used even in combination with immunosuppressants. Further evidence must be gathered and immunological criteria investigated to determine the conditions for safe use. Depending on the results of these investigations, the wording in package inserts and guidelines may need to be revised.
Collapse
Affiliation(s)
- Koichi Kamei
- Division of Nephrology and Rheumatology, National Center for Child Health and Development, Tokyo, Japan.
| |
Collapse
|
5
|
Alnaimat F, Sweis JJG, Jansz J, Modi Z, Prasad S, AbuHelal A, Vagts C, Hanson HA, Ascoli C, Novak RM, Papanikolaou IC, Rubinstein I, Sweiss N. Vaccination in the Era of Immunosuppression. Vaccines (Basel) 2023; 11:1446. [PMID: 37766123 PMCID: PMC10537746 DOI: 10.3390/vaccines11091446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/20/2023] [Accepted: 08/30/2023] [Indexed: 09/29/2023] Open
Abstract
Patients with autoimmune inflammatory rheumatic diseases (AIIRDs) are at increased risk for severe infections. Vaccine responses and safety profiles may differ between AIIRD patients and the general population. While patients with autoimmune inflammatory rheumatic diseases (AIIRDs) often experience diminished humoral responses and reduced vaccine efficacy, factors such as the type of immunosuppressant medications used and the specific vaccine employed contribute to these outcomes. Notably, individuals undergoing B cell depletion therapy tend to have poor vaccine immunogenicity. However, despite these considerations, vaccine responses are generally considered clinically sufficient. Ideally, immunosuppressed AIIRD patients should receive vaccinations at least two weeks before commencing immunosuppressive treatment. However, it is common for many patients to already be on immunosuppressants during the immunization process. Vaccination rarely triggers flares in AIIRDs; if flares occur, they are typically mild. Despite the heightened infection risk, including COVID-19, among AIIRD patients with rheumatoid arthritis, systemic lupus erythematosus, sarcoidosis, and other diseases on immunosuppressants, the vaccination rates remain suboptimal. The future directions of vaccination in the era of immunosuppression will likely involve customized vaccines with enhanced adjuvants and alternative delivery methods. By addressing the unique challenges faced by immunosuppressed individuals, we may improve vaccine efficacy, reduce the risk of infections, and ultimately enhance the health outcomes. Additionally, clinical trials to evaluate the safety and efficacy of temporarily discontinuing immunosuppressants during vaccination in various AIIRDs are crucial.
Collapse
Affiliation(s)
- Fatima Alnaimat
- Department of Internal Medicine, Division of Rheumatology, School of Medicine, University of Jordan, Amman 11942, Jordan
| | | | - Jacqueline Jansz
- Department of Medicine, University of Illinois Chicago, Chicago, IL 60612, USA; (J.J.); (Z.M.); (S.P.)
| | - Zeel Modi
- Department of Medicine, University of Illinois Chicago, Chicago, IL 60612, USA; (J.J.); (Z.M.); (S.P.)
| | - Supritha Prasad
- Department of Medicine, University of Illinois Chicago, Chicago, IL 60612, USA; (J.J.); (Z.M.); (S.P.)
| | | | - Christen Vagts
- Department of Medicine, Division of Pulmonary Critical Care Sleep and Allergy, University of Illinois Chicago, Chicago, IL 60612, USA; (C.V.); (C.A.); (I.R.)
| | - Hali A. Hanson
- College of Pharmacy, University of Illinois Hospital & Health Sciences System, Chicago, IL 60612, USA;
| | - Christian Ascoli
- Department of Medicine, Division of Pulmonary Critical Care Sleep and Allergy, University of Illinois Chicago, Chicago, IL 60612, USA; (C.V.); (C.A.); (I.R.)
| | - Richard M. Novak
- Division of Infectious Diseases, University of Illinois, Chicago, IL 60612, USA;
| | - Ilias C. Papanikolaou
- Department of Respiratory Medicine, Sarcoidosis Clinic, Corfu General Hospital, 49100 Corfu, Greece;
| | - Israel Rubinstein
- Department of Medicine, Division of Pulmonary Critical Care Sleep and Allergy, University of Illinois Chicago, Chicago, IL 60612, USA; (C.V.); (C.A.); (I.R.)
| | - Nadera Sweiss
- Division of Rheumatology, Department of Medicine, University of Illinois Chicago, Chicago, IL 60612, USA;
| |
Collapse
|
6
|
Ishige T, Shimizu T, Watanabe K, Arai K, Kamei K, Kudo T, Kunisaki R, Tokuhara D, Naganuma M, Mizuochi T, Murashima A, Inoki Y, Iwata N, Iwama I, Koinuma S, Shimizu H, Jimbo K, Takaki Y, Takahashi S, Cho Y, Nambu R, Nishida D, Hagiwara SI, Hikita N, Fujikawa H, Hosoi K, Hosomi S, Mikami Y, Miyoshi J, Yagi R, Yokoyama Y, Hisamatsu T. Expert consensus on vaccination in patients with inflammatory bowel disease in Japan. J Gastroenterol 2023; 58:135-157. [PMID: 36629948 PMCID: PMC9838549 DOI: 10.1007/s00535-022-01953-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 12/28/2022] [Indexed: 01/12/2023]
Abstract
Immunosuppressive therapies can affect the immune response to or safety of vaccination in patients with inflammatory bowel disease (IBD). The appropriateness of vaccination should be assessed prior to the initiation of IBD treatment because patients with IBD frequently undergo continuous treatment with immunosuppressive drugs. This consensus was developed to support the decision-making process regarding appropriate vaccination for pediatric and adult patients with IBD and physicians by providing critical information according to the published literature and expert consensus about vaccine-preventable diseases (VPDs) [excluding cervical cancer and coronavirus disease 2019 (COVID-19)] in Japan. This consensus includes 19 important clinical questions (CQs) on the following 4 topics: VPDs (6 CQs), live attenuated vaccines (2 CQs), inactivated vaccines (6 CQs), and vaccination for pregnancy, childbirth, and breastfeeding (5 CQs). These topics and CQs were selected under unified consensus by the members of a committee on intractable diseases with support by a Health and Labour Sciences Research Grant. Physicians should provide necessary information on VPDs to their patients with IBD and carefully manage these patients' IBD if various risk factors for the development or worsening of VPDs are present. This consensus will facilitate informed and shared decision-making in daily IBD clinical practice.
Collapse
Affiliation(s)
- Takashi Ishige
- Department of Pediatrics, Gunma University Graduate School of Medicine, 3-39-22, Showa-Machi, Maebashi, Gunma, 371-8511, Japan.
| | - Toshiaki Shimizu
- Department of Pediatrics and Adolescent Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kenji Watanabe
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo Medical University, Nishinomiya, Japan
| | - Katsuhiro Arai
- Division of Gastroenterology, Center for Pediatric Inflammatory Bowel Disease, National Center for Child Health and Development, Tokyo, Japan
| | - Koichi Kamei
- Division of Nephrology and Rheumatology, National Center for Child Health and Development, Tokyo, Japan
| | - Takahiro Kudo
- Department of Pediatrics, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Reiko Kunisaki
- Inflammatory Bowel Disease Center, Yokohama City University Medical Center, Yokohama, Japan
| | - Daisuke Tokuhara
- Department of Pediatrics, Wakayama Medical University, Wakayama, Japan
| | - Makoto Naganuma
- Department of Gastroenterology and Hepatology, Kansai Medical University, Osaka, Japan
| | - Tatsuki Mizuochi
- Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Atsuko Murashima
- Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center of Child Health and Development, Tokyo, Japan
| | - Yuta Inoki
- Division of Nephrology and Rheumatology, National Center for Child Health and Development, Tokyo, Japan
| | - Naomi Iwata
- Department of Infection and Immunology, Aichi Children's Health and Medical Center, Obu, Japan
| | - Itaru Iwama
- Division of Gastroenterology and Hepatology, Saitama Children's Medical Center, Saitama, Japan
| | - Sachi Koinuma
- Japan Drug Information Institute in Pregnancy, National Center of Child Health and Development, Tokyo, Japan
| | - Hirotaka Shimizu
- Division of Gastroenterology, Center for Pediatric Inflammatory Bowel Disease, National Center for Child Health and Development, Tokyo, Japan
| | - Keisuke Jimbo
- Department of Pediatrics, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Yugo Takaki
- Department of Pediatrics, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan
| | - Shohei Takahashi
- Department of Pediatrics, Kyorin University School of Medicine, Tokyo, Japan
| | - Yuki Cho
- Department of Pediatrics, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Ryusuke Nambu
- Division of Gastroenterology and Hepatology, Saitama Children's Medical Center, Saitama, Japan
| | - Daisuke Nishida
- Inflammatory Bowel Disease Center, Yokohama City University Medical Center, Yokohama, Japan
| | - Shin-Ichiro Hagiwara
- Department of Pediatric Gastroenterology, Nutrition and Endocrinology, Osaka Women's and Children's Hospital, Osaka, Japan
| | - Norikatsu Hikita
- Department of Pediatrics, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Hiroki Fujikawa
- Division of Gastroenterology, Center for Pediatric Inflammatory Bowel Disease, National Center for Child Health and Development, Tokyo, Japan
| | - Kenji Hosoi
- Division of Gastroenterology, Tokyo Metro Children's Medical Center, Tokyo, Japan
| | - Shuhei Hosomi
- Department of Gastroenterology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Yohei Mikami
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Jun Miyoshi
- Department of Gastroenterology and Hepatology, Kyorin University School of Medicine, Tokyo, Japan
| | - Ryusuke Yagi
- Department of Pediatrics, Gunma University Graduate School of Medicine, 3-39-22, Showa-Machi, Maebashi, Gunma, 371-8511, Japan
| | - Yoko Yokoyama
- Department of Intestinal Inflammation Research, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Tadakazu Hisamatsu
- Department of Gastroenterology and Hepatology, Kyorin University School of Medicine, Tokyo, Japan
| |
Collapse
|
7
|
Tamura D, Kurosaki M, Shinjoh M, Nishimura H, Yamagishi H, Yamagata T. Lack of persisting antibody in a post-transplant patient after vaccine-strain varicella. Pediatr Transplant 2021; 25:e14070. [PMID: 34120389 DOI: 10.1111/petr.14070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 05/16/2021] [Accepted: 05/25/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND LAVV have historically been avoided in children after solid organ transplantation. However, it has been reported that post-transplant, children without severe immunosuppression can generate anti-varicella antibody after immunization but the duration of the response is not clear. Furthermore, the origin of the varicella virus in immunosuppressed patients who develop varicella after vaccination is often unclear. CLINICAL PROGRESS A female child received LAVV 30 months after a living donor liver transplant at the age of 2 months. Varicella rash appeared on the trunk 16 days after vaccination and gradually spread over the body. The patient was treated with intravenous acyclovir followed by oral therapy and recovered fully. The virus detected in blisters was derived from the vaccine-type strain. Paired sera before and after the onset of varicella showed an increase in antibody titer. However, 2 years after onset, the antibody titer decreased to undetectable again. CONCLUSIONS This was an informative case of varicella due to vaccine strain attenuated virus. Antibody levels were not maintained over many years. Although varicella was caused by the vaccine-type strain, repeated vaccinations may be necessary for post-transplant patients who develop varicella.
Collapse
Affiliation(s)
- Daisuke Tamura
- Department of Pediatrics, Jichi Medical University, Tochigi, Japan
| | | | - Masayoshi Shinjoh
- Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
| | | | | | | |
Collapse
|