Research Article

Clinical and Microbiologic Efficacy of a Water Filter Program in a Rural Honduran Community

Table 3

Mean bacterial colony count (CFU/100 mL) by bacterial type and year of filter distribution.

Year of filter distribution (number of samples)Colony type and mean number CFU/100 mL
Enterobacter/Citrobacter/Klebsiella (SD)Proteus/Salmonella (SD)E. coli (SD)Noncoliform bacteria (SD)

2012 (5)0256.2 (572.3) 00
2011 (14)765.7 (2183.2)552.9 (1124.5)140 (495.8)0
2010 (11)3434.5 (3763.9)1734.5 (1845.6)16.4 (29.4)120 (311.8)

The number of colony forming units was obtained by counting the number of colonies of each type on the sample plate. This was converted into number of CFU/100 mL dividing 100 by the number of mL of the sample (5 mL) and multiplying that number by the number of colonies counted on the plate.