Search of amantadine-resistance in influenza A strains isolated in Santiago, Chile, 2001-2002 Búsqueda de resistencia a amantadina en cepas de virus influenza A aisladas en Santiago de Chile, entre los años 2001 y 2002.

Fehlmann E.; Le Corre N.; Abarca K.; Godoy, P; Montecinos L.; Veloz A.; Ferrés M.

Keywords: proteins, isolation, validation, chile, resistance, purification, polymorphism, animals, protein, cell, length, chain, matrix, mutation, virus, line, humans, human, male, genetics, agents, polymerase, dogs, aged, agent, adult, female, restriction, rna, drug, infant, article, child, adolescent, dog, fragment, viral, influenza, antibiotic, preschool, animal, study, antiviral, middle, Reaction, Child,, RNA,, a, effect, and, Resistance,, Polymorphism,, protein,, antivirus, M2, amantadine


Amantadine has been used for prevention and treatment of influenza A infection. It blocks the proton through the M2 ion channel. Drug-resistant viruses appear quickly when this therapy is used. Single amino acids changes in the H2 protein can confer resistance, being the most frequent one in position 31. Different methods to detect resistant strains have been described. The objectives were to determine the existence of amantadine resistance of influenza A strains isolated in a virologic laboratory in Santiago, Chile, between 2001-2002, and to validate a new molecular method to detect resistant strains. A PCR restriction fragment length polymorphism analysis was employed for the detection of resistant viruses. In 31 processed strains no mutation in the position 31 was found. This result supports that amantadine resistance is very low or absent in Chile. This could be explained by a limited use of this drug in the study population. This method could be used as a monitoring system to survey resistant viruses.

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Título de la Revista: Revista Chilena de Infectologia
Volumen: 22
Número: 2
Editorial: Sociedad Chilena de Infectología
Fecha de publicación: 2005
Página de inicio: 141
Página final: 146