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. 2022 Apr;37(4):843-848.
doi: 10.1007/s00467-021-05290-7. Epub 2021 Sep 25.

Seroprotection against measles in previously vaccinated children with difficult-to-treat nephrotic syndrome

Jiten Kumar Sahoo  1 , Soumya Tiwari  2 , Viswas Chhapola  1 , Manoj Jais  3
Affiliations

Seroprotection against measles in previously vaccinated children with difficult-to-treat nephrotic syndrome

Jiten Kumar Sahoo et al. Pediatr Nephrol. 2022 Apr.

Abstract

Background: Children with nephrotic syndrome (NS) are vulnerable to infections. Measles infection is an important cause of morbidity and mortality in immunosuppressed children. A suboptimal seroprotection against measles has been shown in immunocompromised children. There is limited published literature on measles immunity in children with difficult-to-treat nephrotic syndrome (DTNS). We compared the proportions of children with DTNS and healthy controls who were seroprotected against measles.

Methods: This was a cross-sectional study. Measles-specific IgG antibodies of 108 children with DTNS (3 to 10 years of age) and an equal number of age-matched healthy controls were measured. All children had received two doses of measles-containing vaccine at 9-12 and 16-24 months of age under routine immunisation programme. Serum measles IgG antibody titres were measured by indirect ELISA. The assay results were interpreted as (1) > 11 NTU (NovaTec Units), positive/seroprotective titres; (2) 9-11, equivocal; and (3) < 9 NTU, negative. Inter- and intra-group comparisons were made to identify the disease characteristics related to seroprotection status.

Results: The proportion of children with protective anti-measles antibodies (n = 70, 65%) was significantly lower in DTNS as compared to controls (n = 88, 81.48%) (p = 0.005). Their median [IQR] antibody titres were also significantly lower than those in controls (14.1 [14] NTU vs. 18.3 [15.2] NTU (p = 0.001). The age, gender, clinical subtype, duration of disease, and type of immunosuppressive therapy were not significantly different between seroprotected and non-seroprotected children with DTNS.

Conclusion: A significantly lower percentage of fully vaccinated children with DTNS were seroprotected against measles compared to healthy controls. A higher resolution version of the Graphical abstract is available as Supplementary information.

Keywords: Measles; Seroprotection; Steroid-resistant nephrotic syndrome; Steroid-sensitive nephrotic syndrome.

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