Cross-sectional study of IgG antibody levels to invasive nontyphoidalSalmonellaLPS O-antigen with age in Uganda

Gates Open Research

article

Lisa Stockdale¹  Angela Nalwoga²  Stephen Nash³  Sean Elias⁴  Gershim Asiki²  Sylvia Kusemererwa²  James J. Gilchrist¹  Robert Newton²  Calman A. MacLennan⁴ 

[1] Department of Paediatrics, University of Oxford;MRC/UVRI and LSHTM Uganda Research Institute;Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine;Nuffield Department of Medicine, University of Oxford;Clinical Epidemiology, University of York

关键词: non-typhoidal salmonella;    NTS;    antibody;    Uganda;   

DOI  :  10.12688/gatesopenres.13034.1

学科分类：电子与电气工程

来源: American Journal Of Pharmtech Research

【 摘 要 】

Invasive nontyphoidal Salmonella (iNTS) disease is a major cause of deaths among children and HIV-infected individuals in sub-Saharan Africa. Acquisition of IgG to iNTS lipopolysaccharide (LPS) O-antigen in Malawi in early childhood corresponds with a fall in cases of iNTS disease suggesting that vaccines able to induce such antibodies could confer protection. To better understand the acquisition of IgG to iNTS in other African settings, we performed a cross-sectional seroepidemiological study using sera from 1090 Ugandan individuals aged from infancy to old age. Sera were analysed for IgG to LPS O-antigen of S. Typhimurium and S. Enteritidis using an in-house ELISA. Below 18 months of age, most children lacked IgG to both serovars. Thereafter, specific IgG levels increased with age, peaking in adulthood, and did not wane noticeably in old age. There was no clear difference in antibody levels between the sexes and the few HIV-infected individuals in the study did not have obviously different levels from uninfected subjects. While IgG to iNTS is acquired at a younger age in Malawian compared with Ugandan children, it is not clear whether this is due to differences in the populations themselves, their exposure to iNTS, or variations between assays used. In conclusion, there is a need to develop a harmonised method and standards for measuring antibodies to iNTS across studies and to investigate acquisition of such antibodies with age across different sites in sub-Saharan Africa.

【 授权许可】

CC BY