Volume 20, Number 6—June 2014
Research
Short-Term Malaria Reduction by Single-Dose Azithromycin during Mass Drug Administration for Trachoma, Tanzania
Table 4
Resistance markers for cloned sequences of Plasmodium falciparum ribosomal PfRp14 protein gene, Tanzania, January 12–July 21, 2009*
Patient ID | Time from azithromycin treatment, d | Parasites/μL by light microscopy | Parasites/μL by real-time PCR | RDT result | No. plasmid clones with WT sequence | Clones with synonymous SNP (no.) | Clones with nonsynonymous SNP (no.) | No. plasmids sequenced |
---|---|---|---|---|---|---|---|---|
1 | 30 | 31,200 | 5,378 | + | 7 | L112L (1) | 0 | 8 |
2 | 30 | ND | 3,177 | ND | 3 | 0 | 0 | 3 |
3 | 30 | ND | 224.9 | ND | 0 | K36K (4) | 0 | 4 |
4 | 67 | 151,000 | 126,506 | + | 2 | 0 | 0 | 2 |
5 | 69 | 74,400 | 55,850 | – | 1 | S85S (1) | 0 | 2 |
6 | 80 | 49,160 | 16,410 | + | 4 | 0 | I38V(1), N109S (1), N166D (1) | 7 |
7 | 82 | 1,840 | 679 | + | 1 | 0 | F114L (1) | 2 |
8 | 94 | 26,760 | 11,030 | – | 1 | 0 | T56I (1) | 2 |
9 | 127 | 0 | 51,075 | + | 3 | 0 | 0 | 3 |
10 | 132 | ND | 22,774 | ND | 0 | 0 | I39S (1), S65N (1) | 4 |
11 | NT | 0 | 69,718 | + | 13 | 0 | A78S (1),† N134D (1), K100R and I126T (1), N166S (1), Y20H, K100%, and I139T (1) | 18 |
12 | NT | 11,160 | 2,495 | + | 2 | 0 | 0 | 2 |
Control | NT | ND | 2 | 0 | 0 | 2 | ||
Control | NT | ND | 2 | 0 | 0 | 2 |
*ID, identification; RDT, rapid diagnostic test; WT, wild type; SNP, single-nucleotide polymorphism; +, positive; ND, not done; –, negative; NT, not treated.
†An A78S nonynonymous SNP in region associated with azithromycin resistance that was not present in other clones.
1Current affiliation: Pfizer, Inc., New York, New York, USA.