Table 3.

Microbial indicators and pathogens in surface water following Ohio River flooding, Kentucky, 2011

	All Locations		Carrollton		Louisville		Owensboro		Paducah
Indicator/ Pathogen	May (n = 13)	July (n = 8)	May (n = 3)	July (n = 2)	May (n = 5)	July (n = 2)	May (n = 0)a	July (n = 2)	May (n = 5)	July (n = 2)
Total Coliforms*
% above LOD	100	100	100	100	100	100	N/A	100	100	100
GM (MPN)	2.34E+03	420	1.99E+03	1.99E+03	2.77E+03	1.07E+03	N/A	121	2.17E+03	121
E. coli**
% above LOD	100	100	100	100	100	100	N/A	100	100	100
GM (MPN)	285	13	554	3.33	402	23.6	N/A	8.74	135	43.4
Enterococci**
% above LOD	100	100	100	100	100	100	N/A	100	100	100
GM (MPN)	335	30	519	24.7	439	22.3	N/A	27.0	197	54.9
Salmonella**
% above LOD	100	38	100	0	100	50	N/A	50	100	50
Cryptosporidium
% above LOD	85	62	67	100	100	50	N/A	50	80	50
Adenovirus*
% above LOD	77	12	67	0	80	50	N/A	0	80	0
Campylobacter*
% above LOD	62	12	100	0	80	0	N/A	0	20	0
E. coli O157:H7
% above LOD	15	0	67	0	0	0	N/A	0	0	0

GM = Geometric mean; MPN = Most probable number per 100 mL.

^*P value < 0.05,

^**P value < 0.01 for linear (total coliforms, E. coli, and Enterococci) and logistic (Salmonella, Campylobacter, and E. coli O157:H7) regression comparing May to July, controlling for city.

^aDue to logistical constraints, we were unable to collect filter samples from Owensboro in May.