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Volume 18, Number 4—April 2012


Cosavirus Infection in Persons with and without Gastroenteritis, Brazil

Andreas Stöcker1, Breno Frederico de Carvalho Dominguez Souza1, Tereza Cristina Medrado Ribeiro1, Eduardo Martins Netto, Luciana Oliveira Araujo, Jefferson Ivan Corrêa, Patrícia Silva Almeida, Angela Peixoto de Mattos, Hugo da Costa Ribeiro, Diana Brasil Pedral-Sampaio, Christian Drosten, and Jan Felix DrexlerComments to Author 
Author affiliations: University of Bonn Medical Centre, Bonn, Germany (A. Stöcker, C. Drosten, J.F. Drexler); Federal University of Bahia, Salvador, Brazil (A. Stocker, B.F.C.D. Souza, T.C.M. Ribeiro, E.M. Netto, L.O. Araujo, J.I. Corrêa, P.S. Almeida, A.P. de Mattos, H.C. Ribeiro Jr, D.B. Pedral Sampaio)

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Table 2

Oligonucleotides used for detection and quantification of cosaviruses*

Oligonucleotide identity Sequence, 5′ → 3′ Genomic target region, RT-PCR type Use Reference
DKV-N5U-F1 CGTGCTTTACACGGTTTTTGA (+) 5’-UTR, nested RT-PCR 1st round Cosavirus detection† (3)
HCosV-rtF735-1 TTGTAGYGATGCTGTRTGTGTGTG (+) 5’-UTR, real time RT-PCR Brazilian cosavirus quantification† This study

*RT-PCR, reverse transcription PCR; UTR, untranslated region; FAM, fluorescein; R, G/A; DDQ1, deep dark quencher 1; Y, C/T.
†RT-PCR reactions were carried out using the QIAGEN One-step RT-PCR kit as described by the manufacturer (QIAGEN, São Paulo, Brazil), 300 nmol/L of each primer, 200 nmol/L of the probe (real time RT-PCR assay), 1 μg bovine serum albumin, and 5 μL RNA extract. Second-round reactions used the Platinum Taq DNA Polymerase Kit as described by the manufacturer (Invitrogen, São Paulo, Brazil) with 2.5 mol/L MgCl and 1 µL of first-round PCR product. Real time RT-PCR amplification involved 55°C for 15 min, 95°C for 15 min, and 45 cycles of 95°C for 15 s and 58°C for 30 s (fluorescence measured).Nested RT-PCR involved 30 min at 50°C; 15 min at 95°C; 10 cycles of 20 s at 94°C, 30 s starting at 60°C with a decrease of 1°C per cycle, and 50 s at 72°C; and 40 cycles of 20 s at 95°C, 30 s at 54°C, and 50 s at 72°C; and a final elongation step of 5 min at 72°C. Second-round reactions used 3 min at 94°C and thermal cycling as for the first round.

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1These authors contributed equally to this article.