Abstract
Background
Inborn errors of IL-12/IL-23-IFNγ immunity underlie Mendelian susceptibility to mycobacterial diseases (MSMD), a group of immunodeficiencies characterized by a highly selective susceptibility to weakly virulent strains of mycobacteria, such as non-tuberculous mycobacteria (NTM) and bacillus Calmette-Guérin (BCG). Cutaneous mycobacterial infections are common in MSMD and may represent a red flag for this immunodeficiency.
Objectives
We present a case series of four paediatric patients with MSMD, specifically with IFNγR1 and STAT1 deficiencies, and cutaneous NtM/BCG infections to increase awareness of this immunodeficiency, which may, in some cases, be intercepted by the dermatologist and thus timely referred to the immunologist.
Materials & Methods
Clinical, laboratory and genetic investigations of the four paediatric patients with MSMD are presented.
Results
All four presented patients experienced early complications after BCG vaccination. Two patients suffered recurrent mycobacteriosis, one patient experienced delayed BCG reactivation, and one patient died of disseminated avian mycobacteriosis. The dermatological manifestation in these patients included destructive nasal ulcerations, scrofuloderma of various sites and lupus vulgaris. All patients had a normal basic immune phenotype.
Conclusion
The presented cases demonstrate that NTM/BCG infections in otherwise seemingly immunocompetent patients should raise suspicion of MSMD. This is of utmost importance as specific therapeutic approaches, such as IFNγ treatment or haematopoietic stem cell transplantation, may be employed to improve the disease outcome.
Key words: MSMD, mendelian susceptibility to mycobacterial diseases, IFNγR1, STAT1, inborn error of immunity, non-tuberculous mycobacteria, BCG, necrotizing granulomas, antituberculotics
Acknowledgements
We gratefully thank our patients and their families for placing their trust in us and giving their consent to publish. We thank Irena Hejcmannova MD (Dermatology, Derma Plus, Tábor, Czech Republic) for clinical expertise and collaboration, Nada Mallatova MD and Marie Mikulasova MD (both from Laboratory for Clinical Microbiology and Parasitology, Hospital Ceske Budejovice, Czech Republic) for valuable microbiology consultations and for figures of mycobacterial cultures, Marek Grega MD (Department of Pathology and Molecular Medicine, 2nd Faculty of Medicine, University Hospital Motol, Prague, Czech Republic) for P1 histopathology images, Blanka Rosova MD (Department of Pathology and Molecular Medicine Characteristics, 3rd Faculty of Medicine, Thomayer University Hospital, Prague, Czech Republic) for P2 histopathology images, Dr. Zuzana Parackova (Department of Immunology, 2nd Faculty of Medicine, University Hospital Motol, Prague, Czech Republic) for performing functional assays to evaluate aspects of IL-12/IL-23-IFNγ immunity, prof. Tomas Freiberger MD, Hana Grombirikova MSc, (Centre for Cardiovascular Surgery and Transplantation, Brno, Czech Republic) and prof. Jacinta Bustamante MD (Laboratoire de Génétique Humaine des Maladies Infectieuses, Institut National de la Santé et de la Recherche Médicale et Université Paris Descartes, France) for the genetic evaluation of the patients.
Funding
This work was supported by grant NV18-05—00162 from the Ministry of Health of the Czech Republic.
Footnotes
Conflicts of interest
None.
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