A species-specific assay was used to confirm
P. falciparum infection, using established primers, probe, and conditions15 (
link); forward primer was 5′-CTTTTGAGAGGTTTTGTTACTTTGAGTAA-3′, reverse primer 5′-TATTCCATGCTGTAGTATTCAAACACAA-3′, and probe sequence 5′-TGTTCATAACAGACGGGTAGTCATGATTGAGTTCA-3′ labeled with 5′ FAM and 3′ TAMRA as reporter and quencher, respectively. A real-time generic
Plasmodium spp. assay was then used to quantify gene copies of 18S rDNA using established primers, probe, and conditions16 (
link); forward primer was 5′-GCTCTTTCTTGATTTCTTGGATG-3′, reverse primer 5′-AGCAGGTTAAGATCTCGTTCG-3′, and probe sequence 5′-ATGGCCGTTTTTAGTTCGTG-3′.
Amplification and real-time measurements were performed in the
5-plex Rotorgene Q (Qiagen) with the following thermal profile for quantitative PCR (qPCR): 10 minutes at 95°C, 50 cycles of 15 seconds at 95°C, and 1 minute at 60°C. For the reaction, 2 μL template was added to 8 μL reaction master mix containing 1× QuantiTect Multiplex PCR Master Mix NoROX (Qiagen), 0.4 μM of each primer, and 0.2 μM probe.
Relevant primers derived from the
kelch13 gene sequence were used to amplify the full
kelch13 open reading frame using a nested PCR protocol.17 (
link)
Wihokhoen B., Dondorp A.M., Turner P., Woodrow C.J, & Imwong M. (2016). Use of Blood Smears and Dried Blood Spots for Polymerase Chain Reaction–Based Detection and Quantification of Bacterial Infection and Plasmodium falciparum in Severely Ill Febrile African Children. The American Journal of Tropical Medicine and Hygiene, 94(2), 322-326.