Table 4. Presence of mutations in the gyrA and parC genes in 76 ciprofloxacin-resistant Escherichia coli isolated from 20 healthy chicken farms in the region of Dakar, Senegal.

Amino acid changes in gyrA		Amino acid changes in parC		No. of isolates carrying mutation(s) (% and 95%CI)	No. of farms of origin (% and 95%CI)
Ser83	Asp87	Ser80	Glu84
Leu	Asn	Ile	-	62 (82.2; 76.5–87.9)	19 (95.0; 75.1–99.9)
Leu	Asn	-	Lys	1 (1.7; 0.0–5.3)	1 (5.0; 0.1–24.8)
Leu	Asn	Ile	Gly	2 (2.3; 0.0–5.6)	2 (10.0; 1.2–31.7)
Leu	Asn	Arg	-	1 (1.9; 0.0–5.2)	0 (0.0; 0.0–16.8) a
Leu	Asn	-	-	2 (2.3; 0.0–5.7)	2 (10.0; 1.2–31.7)
Tyr	Asn	-	-	1 (0.8; 0.0–2.2)	1 (5.0; 0.1–24.8)
Leu	-	Ile	-	3 (4.7; 0.0–9.5)	2 (10.0; 1.2–31.7)
-	-	Ile	-	2 (1.9; 0.0–5.9)	2 (10.0; 0.0–23.2)
-	-	-	-	2 (1.7; 0.0–4.5)	2 (10.0; 1.2–31.7)

^aPrevalence at farm level was computed using feaces and drinking water sample and the isolate carrying these mutations was from rinsing water; Ser, serine; Leu, leucine; Tyr, tyrosine; Asp, aspartic acid; Asn, asparagine; Ile, isoleucine; Arg, arginine; Glu, glutamic acid; Lys, lysine.