Immuno-biochemical evaluations of phenol and thimerosal as antigen preservatives in Montenegro skin test

Acta Tropica
Wilson MayrinkVicente de Paulo Coelho Peixoto de Toledo

Abstract

Montenegro skin test (MST) represents the main complementary diagnostic test for tegumentary leishmaniases (TL) in endemic regions. Most antigen formulations used for the MST contain thimerosal as preservative. The Food and Drug Administration (FDA), however, recommended reducing or eliminating thimerosal from vaccines and other biological reagents and the Agência Nacional de Vigilância Sanitária (ANVISA) in Brazil, prohibited the use of mercurial compounds in immunobiologicals. In the search for an alternative stabilizer, phenol and thimerosal were tested as antigen preservatives in MST. Formulations were tested when fresh and after a 12-month storage at 4 degrees C in TL confirmed mice and human patients, and were evaluated for protein constitution by SDS-PAGE, Western blot and anti-gp63 ELISA. In mice, a decrease in the diagnostic effectiveness in merthiolate formulation was observed after a 12-month storage. SDS-PAGE, Western blot and anti-gp63 ELISA analyses showed a degradation of antigen proteins in both formulations after 12-month storage and that phenol-preserved antigen was quantitatively and qualitatively better than the merthiolate-preserved one. In patients, the average of induration diameter was larger in fresh an...Continue Reading

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Citations

Jan 17, 2009·Topics in Magnetic Resonance Imaging : TMRI·Michael Schulder
Jun 1, 2013·Indian Journal of Dermatology·Giti SadeghianMohammad Ali Nilforoushzadeh
Nov 7, 2016·Environmental Research·José G Dórea
Mar 9, 2010·Memórias do Instituto Oswaldo Cruz·Wilson MayrinkVicente de Paulo Coelho Peixoto da Toledo

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