Seropositivity to anti-phenolic glycolipid-I in leprosy cases, contacts and no known contacts of leprosy in an endemic and a non-endemic area in northeast Brazil.

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TitleSeropositivity to anti-phenolic glycolipid-I in leprosy cases, contacts and no known contacts of leprosy in an endemic and a non-endemic area in northeast Brazil.
Publication TypeJournal Article
AuthorsFrota CC, Freitas MVC, Foss NT, Lima LNC, Rodrigues LC, Barreto ML, Kerr LRS
Abbrev. JournalTrans. R. Soc. Trop. Med. Hyg.
JournalTransactions of the Royal Society of Tropical Medicine and Hygiene
Year of Publication2010
Volume104
Issue7
Pagination490-5
Publication Languageeng
KeywordsAdolescent, Adult, Aged, Aged, 80 and over, Antibodies, Bacterial, Antigens, Bacterial, Biomarkers, Brazil, Contact Tracing, Cross-Sectional Studies, Enzyme-Linked Immunosorbent Assay, Female, Glycolipids, Humans, Immunoglobulin M, Leprosy, Leprosy, Lepromatous, Leprosy, Tuberculoid, Male, Middle Aged, Seroepidemiologic Studies, Young Adult
Abstract

The seroprevalence rates of IgM anti-phenolic glycolipid-I (PGL-I) antibodies in four study groups with differing exposure to Mycobacterium leprae in Ceará, Brazil were investigated between March 2005 and August 2006. The first three groups in a high prevalence area included 144 cases of leprosy, their 380 contacts and 317 participants with no known leprosy contact. The fourth group in a low prevalence area consisted of 87 participants with no known leprosy contact living in an area in which no cases of leprosy had been reported in the previous 6 months. Seropositivity and levels of IgM antibodies to PGL-I were investigated using ELISA. The seropositivity levels of anti-PGL-I among the different clinical forms of leprosy cases were 61% for lepromatous, 25% for tuberculoid and 27% indeterminate. The levels of anti-PGL-I antibodies in the endemic area differentiated leprosy cases from non-cases. However, the seropositivity was similar among contact cases (15.8%) and no known leprosy contact cases from high (15.1%) and low (13.8%) prevalence areas. The seropositivity of both contacts and no known contacts was much higher than previously reported among no known contacts in other endemic areas. The study indicates that anti-PGL-I antibodies are not useful as immunological markers of household leprosy contacts and no known leprosy contacts in endemic areas.

PubMed URL

http://www.ncbi.nlm.nih.gov/pubmed/20447668?dopt=Abstract

DOI10.1016/j.trstmh.2010.03.006