Abstract

ACEVEDO, Ana María et al. DEVELOPMENT OF POSITIVE CONTROLS FOR MOLECULAR METHODS OF AVIAN INFLUENZA VIRUS DETECTION. Rev Salud Anim. [online]. 2009, vol.31, n.1, pp.50-54. ISSN 0253-570X.

Avian influenza is a great threat for animal and human health, thus strengthening diagnostic systems against probable outbreaks is a priority all over the world. That is why detection is important by the use of molecular methods (RT-PCR and Real Time RT-PCR) due to their high speed, sensitivity and specificity allowing to take control measures in order to avoid the dissemination of the agent. In this work, the obtaining and evaluation of amplification and quantification positive controls for RT-PCR and Real Time RT-PCR (RRT-PCR) have been described. They were obtained from the cloning of two PCR products, one of them corresponding to a region of the subtype H5 hemagglutinin gene and the other to the matrix gene (M) for Influenza type A. The primers were selected keeping in mind that the PCR products included the corresponding regions of H5 and influenza type A primer couples reported by RT-PCR and RRT-PCR of OIE/ FAO reference laboratories for the diagnosis of this disease. From an RNA extracted from H5N2 strain (kindly donated by the OIE reference laboratory for avian influenza), the cDNA used as a mold for the amplification with the primers J3/J1C for H5 subtype and M2 M+25 for Influenza type A, recommended by reference laboratories, was obtained. A clone from which a fragment of the size expected was amplified, was selected as a positive control in the detection assays of nucleic acids for the H5 subtype and influenza A type. Also, the H5 plasmid was evaluated for RRT-PCR and a standard curve with a Ct of 15 was obtained. The amplification control obtained for H5 subtype detection will allow to standardize assays and evaluate possible negative falses for the quick detection of this subtype in Cuba; and in the case of the positive control for influenza type A it will be used for quantification in RRT-PCR assays.

Keywords : Avian influenza; amplification and quantification positive controls; molecular diagnostic; influenza.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )