Table 2.

Isolate data and diversity indices summary for the three investigated sites: diesel car tank (DCT), diesel pump dispensers (DPD), and gasoline pump dispensers (GPD).

	DCT	DPD	GPD	Total
No. of isolates	52	30	42	124
No. of positive sampling sites	25	21	29	75
No. of taxa	21	13	14	32
Shannon index	2.522	2.434	2.367	2.687
Simpson index	0.8145	0.8828	0.8722	0.8558
Chao-1 index	43.31	18.08	19.13	101.4