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BMC Research Notes

, 11:717 | Cite as

Poliovirus excretion following vaccination with live poliovirus vaccine in patients with primary immunodeficiency disorders: clinicians’ perspectives in the endgame plan for polio eradication

  • Nermeen M. Galal
  • Safaa Meshaal
  • Rabab ElHawary
  • Eman Nasr
  • Laila Bassiouni
  • Humayun Ashghar
  • Noha H. Farag
  • Ondrej Mach
  • Cara Burns
  • Jane Iber
  • Qi Chen
  • Aisha ElMarsafy
Open Access
Research note

Abstract

Objective

Primary immunodeficiency (PID) patients are prone to developing viral infections and should not be vaccinated with live vaccines. In such patients, prolonged excretion and viral divergence may occur and they may subsequently act as reservoirs in the community introducing mutated virus and jeopardizing polio eradication. One hundred and thirty PID cases were included for poliovirus detection in stool with assessment of divergence of detected polioviruses from oral polio vaccine (OPV) virus. Clinical presentations of PID patients with detectable poliovirus in stool specimens are described.

Results

Six PID patients (4.5%) had detectable vaccine-derived poliovirus (VDPV) excretion in stool specimens; of these, five patients had severe combined immunodeficiency (two with acute flaccid paralysis, one with meningoencephalitis and two without neurological manifestations), and one patient had X-linked agammaglobulinemia (paralysis developed shortly after diagnosis of immunodeficiency). All six case-patients received trivalent OPV. Five case-patients had type 2 immunodeficiency-related vaccine-derived polioviruses (iVDPV2) excretion; one had concomitant excretion of Sabin like type 3 virus and one was identified as iVDPV1 excretor. Surveillance for poliovirus excretion among PID patients is critical as these patients represent a potential source to reseed polioviruses into populations.

Keywords

Polio eradication Immunodeficiency Virus excretion 

Abbreviations

PID

primary immunodeficiency disorders

IUIS

International Union of Immunological Socities

SCID

severe combined immunodeficiency disorder

AFP

acute flaccid paralysis

XLA

X-linked agammaglobulinemia

iVDPV

immunodeficiency-related vaccine-derived polioviruses

SL

Sabin like virus

MHC class II

major histocompatibility complex II

OPV

oral polio vaccine

BMT

bone marrow transplantation

CDC

Centers for Disease Control and Prevention

CVID

common variable immunodeficiency disorder

Introduction

Primary immunodeficiency disorders (PIDs) are a group of diseases that mainly present with recurrent, severe or unusual infections. PIDs are underreported in developing countries because of lack of awareness. Given high rates of consanguinity in some countries, autosomal recessive disorders form the bulk of PIDs compared to Western populations. In Egypt, studies found that combined T cell and B-cell immunodeficiency disorders were more common than B-cell deficiency disorders alone [1, 2].

A study of poliovirus excretion among patients with PIDs from 13 OPV-using countries reported that patients with combined immunodeficiency (CID) disorders had an increased risk of delayed poliovirus clearance compared to patients with humoral deficiencies [3]. In Egypt, due to the absence of neonatal screening programs for PIDs, such patients often present to medical care after having received repeated OPV doses. Prolonged intestinal replication of OPV virus in PID patients can lead to development of vaccine-derived polioviruses (VDPV), which are referred to as immunodeficiency-related VDPV (iVDPV) [4]. VDPV excretors pose a threat to polio eradication efforts because they may continue to excrete and act as a reservoir in the community. They may develop acute flaccid paralysis (AFP) in various forms [5].

Main text

Methodology

Children seen at Cairo University with suspected PID diagnosed per the IUIS classification [6] were investigated after informed consent was obtained from their guardians. In addition, VDPV-excreting AFP case-patients, detected through the AFP surveillance system, were assessed using flow cytometric immunophenotyping of peripheral lymphocytes and immunoglobulin quantitation by nephelometry. Normal lymphocyte subsets were assessed according to age [7].

Two stool specimens, 24–48 h apart, were collected. The laboratory at VACSERA conducted poliovirus isolation, as well as intratypic differentiation (ITD) real-time PCR assays as per Global Polio Laboratory Network guidelines [8].

All detected polioviruses were genetically sequenced by the Polio and Picornavirus Laboratory, CDC. A VDPV was defined as a poliovirus isolate with at least ≥ 10 nucleotide differences in the VP1 region from Sabin strain for serotypes 1 and 3, and ≥ 6 differences for serotype 2 [9]. A Sabin-like (SL) virus was defined as virus related to Sabin vaccine virus with no mutations or lower number of nucleotide differences from Sabin than required for VDPV classification (< 10 nucleotide differences for poliovirus types 1 and 3 and < 6 for poliovirus type 2). If a VDPV or SL virus was detected, stool sampling was repeated monthly until either the sample was no longer positive on three occasions or the patient was lost to follow-up.

Results

One hundred and thirty patients with suspected or confirmed PID disorders were screened; six (4.6%) patients were excreting VDPV (Fig. 1).
Fig. 1

Detection of vaccine-derived poliovirus among patients with suspected or confirmed primary immunodeficiency (PID) disorders diagnosed at Cairo University Immunology Center, Egypt, 2011–2017. PID primary immune deficiency, SCID severe combined immunodeficiency, XLA X-linked agammaglobulinemia, AFP acute flaccid paralysis. *Patients presented with acute flaccid paralysis (AFP), were screened for poliovirus excretion and referred to Cairo University Immunology Center for PID screening. Seventh patient excreted SL3, no VDPV was isolated

  • Three (2.3%) cases developed AFP following vaccination.

  • Five cases of severe combined immunodeficiency disorder (SCID):
    • Two presented with AFP.

    • Two without neurological manifestations.

    • One presented with fever, seizures and altered consciousness (meningoencephalitis).

  • One case of XLA (X-linked agammaglobulinemia) developed AFP.

All AFP case-patients received OPV vaccine. Five AFP case-patients were identified as iVDPV2 excretors (one patient had concomitant excretion of SL virus type 3) and one was identified as an iVDPV1 excretor.

A seventh MHC Class II deficiency patient developed AFP following OPV. She excreted SL3 virus and died a few weeks shortly after. No iVDPV excretion was detected in this patient until death.

Patient 1

A 7-month-old female presented with acute pneumonia, diarrhea, failure to thrive and candidiasis. The patient had no evidence of neurological disease. Immunologic investigation identified absolute lymphopenia with low CDs and Immunoglobulins. A diagnosis of T-B− SCID due to RAG2 homozygous mutation [c.283G>A] was confirmed. An iVDPV2 was detected and viral shedding persisted for 5 months until death from pneumonia.

Patient 2

A 6-month-old female infant presented with recurrent oral thrush and unresolving pneumonia. Her family history was positive. Screening identified lymphopenia with low CDs and Immunoglobulins. A diagnosis of T-B− SCID was made, and the molecular defect was found in the DCLRE1C gene. She had received 3 doses of OPV. An iVDVP2 with 11 nucleotide differences from Sabin vaccine strain was detected and viral shedding persisted for 3 months until death after a failed BMT.

Patient 3

A 10-month-old male born to consanguineous parents presented with unresolving pneumonia, pericardial effusion, draining ears and persistent candidiasis. Screening identified leucopenia, lymphopenia, low CD3 and CD4 levels, and undetectable immunoglobulins. A diagnosis of MHC class II deficiency was made with a homozygous mutation in RFX5 [c.715C>T]. Shortly after diagnosis, he developed AFP and iVDPV2 with 11 nucleotide differences from Sabin vaccine virus was detected and viral shedding persisted for 3 months until the patient died. The patient received 5 doses of OPV, including 3 doses of trivalent OPV and 2 doses of bivalent OPV (containing serotypes 1 and 3).

Patient 4

A 6-month-old male infant presented with AFP following the second dose of OPV. Illness started as loss of neck support along with asymmetrical weakness involving both lower limbs, followed by generalized weakness and seizures. Acute disseminated encephalomyelitis (ADEM) was suspected and the patient received intravenous immunoglobulin (IVIG) and steroids. On assessment he was leucopenic and lymphopenic; had low CDs. His IgG was high (just received IVIG) and IgM was low. A diagnosis of T-B+ SCID was made, but the molecular defect was not identified. MRI scanning of the brain showed atrophic frontal lobes with bilateral thalamic patches, judged to be mostly inflammatory in nature. Electromyogram was suggestive of anterior horn cell lesion. The infant also showed a picture of viral myocarditis based on echocardiography with elevated troponin I and mass creatine kinase (MMB). Stool sample revealed iVDPV2 excretion with 1% nucleotide divergence (10 nucleotide differences). Patient died after 3 months.

Patient 5

A 14-month-old male presented with AFP associated with disturbed consciousness following OPV. Over 40 days, the patient gradually improved with the left lower limb more affected than the left upper limb, with regain of neck support and ability to sit unsupported. EMG showed evidence of anterior horn cell loss. Following another OPV dose at the age of 9 months, the patient developed progressive right lower limb weakness; both upper limbs were also affected. The clinical condition slightly improved till clinical relapse was reported by the family 15 days after a newborn sibling received OPV. No specimens were collected at that time. On assessment, he had otitis media once. Investigations showed a normal leucocytic count with complete absence of B cells (CD19: 0) and undetectable immunoglobulins. A diagnosis of agammaglobulinemia was made. An iVDPV2 with 17 nucleotide differences from Sabin virus, and SL3 were detected in a stool sample. Viral shedding lasted for 5 months and ceased following IVIG administration.

Patient 6

A 22 month-old female, presented with persistent diarrhea, recurrent pneumonia and repeated blood transfusions. One month after her fourth polio dose at the age of 7 months, she developed fever, convulsions, and disturbed consciousness and was admitted with the diagnosis of meningoencephalitis. Investigations showed a low leucocytic count with absolute lymphopenia (ALC: 1656), low CDs and immunoglobulins. A diagnosis of T-B+ SCID was made. Stool sample revealed IVDPV1 with 22 nucleotide differences. The patient died 2 months later.

Patient 7

A 9-month-old female, presented with persistent diarrhea, pneumonia and failure to thrive. At the age of 11 months she developed right lower limb hypotonia followed left lower limb affection and progressed to bulbar symptoms followed by coma. The patient received IVIG repeatedly without improvement. EMG and nerve conduction results were consistent with severe diffuse axonal polyneuropathic disease. Family history was positive and investigations revealed CD4 lymphopenia, with undetectable immunoglobulins. There was very defective expression of MHCII on the surface of lymphocytes [HLA DR was 0.6% and CD19+/DR+ was 0.3%]. The diagnosis of MHC Class II deficiency was confirmed by identifying a homozygous missense mutation in RFXANK gene [c.431T>C]. The first stool sample analysis revealed excretion of SL3. Patient died a few weeks thereafter.

Discussion

This study included PID patients with humoral immunodeficiencies with or without combined cellular immune defects because all patients with poliovirus excretion reported to date have been in these categories [3, 10]. In this study 4.5% of PID patients were identified to be iVDPV excretors which is comparable with 7.3% found in the study conducted among Tunisian patients [3] and much higher than 0.8% found in study from 2014 to 2015 in patients at 19 Jeffrey Model Foundation sites [3].

In our study, iVDPV2 was detected in five of six iVDPV excretors. In 2013, the World Health Assembly endorsed the phased withdrawal of OPV and the introduction of inactivated poliovirus vaccine (IPV) into childhood routine immunization schedules. Type 2 OPV was withdrawn through a globally synchronized “switch” from trivalent OPV (all three types) to bivalent OPV (types 1 and 3) in 155 OPV-using countries in 2016 [11]. Type 2 wild poliovirus was declared eradicated in 2015; however type 2 vaccine virus is the main cause of VDPV outbreaks and approximately 40% of vaccine-associated paralytic polio cases [12].

Most international reports associate iVDPV excretion with patients with antibody deficiency disorders [13, 14]. SCID and combined immunodeficiencies are inherited predominantly in an autosomal recessive manner, thus in inbred populations, the collective results of the AFP surveillance confirmed that the majority of iVDPV cases were among combined immunodeficiency patients rather than among antibody deficiency disorders [15, 16]. As SCID newborn screening is absent in Egypt, the discovery of most SCID patients is delayed after having received several OPV doses. Since bone marrow transplantation therapy is being offered to more patients, they may live longer allowing prolonged virus excretion as with the case reported in Israel [17].

An important PID is the MHC Class II deficiency which has a milder phenotype than SCID patients. It is prevalent in the Middle East region and constitutes an important fraction of patients in populations with high consanguinity as reported by Ben Mustapha et al. [18]. In our study, MHC II deficiency was confirmed in one of the iVDPD2 patients associated with AFP and in the patient with SL3 excretion and AFP. MHC II deficiency patients were also previously reported to demonstrate intermittent iVDPV excretion episodes as well as reinfection with OPV/Sabin like and or non-polio enteroviruses, an observation that necessitates long-term follow up for those patients [3]. Because MHC class II deficiency has a milder phenotype, patients may present later and live longer and pose a public health threat if undiagnosed and shedding virus in the community.

As reported by Driss et al. [19] a Tunisian patient diagnosed with MHC II deficiency exhibited sequential infection by 9 different enterovirus serotypes within a 2-year period. El-Sayed et al. [15] also reported on a PID patient who demonstrated evolution of VDPV in his stool samples over time which again highlights the importance of follow up as they may demonstrate intermittent shedding or evolution with time.

As for humoral defects, patient 5 diagnosed with antibody deficiency cleared virus shedding (iVDPV2 + SL3) following regular institution of IVIG replacement therapy only to relapse (by history) following OPV vaccination of his sibling, emphasizing the implications of contact vaccination for PID families. It is also important to note that AFP can be an initial presentation of PID disorders (patients 4 and 5) and therefore AFP case-patients excreting VDPV should be assessed for immunodeficiency disorders.

Conclusion

It is critical that paediatricians are aware of the early manifestations that lead to the suspicion of PID, and that they understand the risks associated with the exposure of PID patients to OPV, whether by direct administration or by exposure following OPV vaccination of household contacts. Humoral deficiencies, SCID and CID patients are particularly at risk of developing iVDPV excretion. MHC II deficiency poses a particular risk. Surveillance for prolonged VDPV excretion in countries using OPV is crucial until global cessation of OPV use and the shift towards IPV replacement of OPV vaccination is completed.

Limitations

No patients with CVID were identified in the study as it was focused on the paediatric age.

Notes

Authors’ contributions

NG, AE, HA, OM, NF were involved in design of the study and supervised the overall study. NG, AE, SM, RE diagnosed the cases with PID, EN, LB, CB, JI, QC performed the viral isolation and intratypic differentiation. NF, LB, EN were involved in the analyses of the study. NG and AE wrote the manuscript, NG, SM, RE, EN, LB, HA, OM, NF, CB, JI, QC, AE reviewed the final manuscript. All authors read and approved the final manuscript

Acknowledgements

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

Data sharing is not applicable to this article.

Consent for publication

Not applicable.

Disclaimer

The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.

Ethics approval and consent to participate

Written informed consents were obtained from the patients’ legal guardians and after institutional review board approval (Cairo University).

Funding

No funding Grants were received—The laboratory at VACSERA, Cairo, carried out virus isolation from stool samples, as well as testing by intratypic differentiation (ITD) real time PCR assays; and the Polio and Picornavirus Laboratory, Centers for Disease Control and Prevention, Atlanta, USA, genetically sequenced the polioviruses.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors and Affiliations

  • Nermeen M. Galal
    • 1
  • Safaa Meshaal
    • 2
  • Rabab ElHawary
    • 2
  • Eman Nasr
    • 3
  • Laila Bassiouni
    • 3
  • Humayun Ashghar
    • 4
  • Noha H. Farag
    • 5
  • Ondrej Mach
    • 4
  • Cara Burns
    • 5
  • Jane Iber
    • 5
  • Qi Chen
    • 5
  • Aisha ElMarsafy
    • 1
  1. 1.Department of PediatricsCairo University, Cairo University Specialized Pediatric HospitalCairoEgypt
  2. 2.Department of Clinical and Chemical PathologyCairo UniversityCairoEgypt
  3. 3.Holding Company for Biological Products and Vaccines, VACSERA, Regional Reference Polio LaboratoryGizaEgypt
  4. 4.World Health Organization, EMRO and HQGenevaSwitzerland
  5. 5.Centers for Disease Control and PreventionAtlantaUSA

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