TABLE 3.

Frequency of class 1 integrons in phenotypically resistant E. coli isolates from people, livestock, and wild primates in western Uganda^a

Integronb	Cassette	% of isolates containing integron cassette
		Bwindi				Kibale								All (n = 499)
		HU (n = 48)	CA (n = 3)	GT (n = 27)	GO (n = 37)	HU (n = 276)	DO (n = 0)	CA (n = 8)	GT (n = 40)	BW (n = 11)	RC (n = 11)	RT (n = 25)	CZ (n = 13)
A	dfrA17	33.3	66.7	14.8	0.0	24.3	0.0	12.5	10.0	0.0	0.0	0.0	0.0	18.8
B	dfrA1 aadA1	4.2	0.0	7.4	2.7	3.6	0.0	0.0	10.0	9.1	0.0	16.0	0.0	4.8
C	dfrA5	8.4	0.0	0.0	0.0	2.2	0.0	0.0	5.0	0.0	0.0	0.0	0.0	2.4
D	dfrA17 aadA5	8.4	0.0	0.0	0.0	2.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	2.4
E	dfrA15 aadA1	2.1	0.0	0.0	0.0	2.5	0.0	0.0	0.0	0.0	0.0	0.0	0.0	1.6
F	aadA1	6.3	0.0	0.0	0.0	1.1	0.0	0.0	2.5	0.0	0.0	0.0	0.0	1.4
G	blaOXA-1 aadA2	0.0	0.0	0.0	0.0	2.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	1.2
H	dfrA1 catB3 aacA4	0.0	0.0	0.0	0.0	0.7	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.4
I	dfrA12 aadA2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	2.5	0.0	0.0	0.0	0.0	0.2
Allc		62.7	66.7	22.2	2.7	39.5	0.0	12.5	30.0	9.1	0.0	16.0	0.0	33.3

^aValues in parentheses indicate numbers of phenotypically resistant (multiple and single resistance) E. coli isolates tested for class 1 integrons using PCR. Values in the table indicate percentages of such isolates containing the specified integron cassette. HU, human; CA, cattle; GT, goat/sheep; GO, mountain gorilla; DO, dog; BW, black-and-white colobus; RC, red colobus; RT, red-tailed guenon; CZ, chimpanzee. Complete integron cassette sequences are available in GenBank (accession numbers MH560801 to MH560966).

^bNine E. coli isolates, all from humans, contained two class 1 integrons, i.e., four isolates containing integrons C and F, two isolates containing integrons A and B, two isolates containing integrons A and D, and one isolate containing integrons A and F.

^cFrequency of all class 1 integrons combined.