Table 1.
Gram-negative bacteria isolated from Periplaneta americana (n= 130) and Blatella germanica (n= 73) collected in Households and Food-handling establishments
| Cockroaches | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Periplaneta americana | Blatella germanica | |||||||||||
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| Bacteria | Households (n= 52) | Food-handling establishments (n= 78) | Households (n= 27) | Food-handling establishments (n= 46) | ||||||||
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| No* | % | Mean Load* | No* | % | Mean Load* | No* | % | Mean Load* | No* | % | Mean Load* | |
| Klebsiella pneumoniae | 7.0 | 13.5 | 4.2 × 107 | 17.0 | 21.8 | 3.9 ×108 | 7.0 | 25.9 | 4.1 × 107 | 11.0 | 23.9 | 3.7 × 108 |
| Escherichia coli | 9.0 | 17.3 | 3.5 × 106 | 14.0 | 17.9 | 4.0 × 107 | 5.0 | 18.5 | 3.9 × 106 | 8.0 | 17.4 | 4.1 × 106 |
| Enterobacter aerogenes | 7.0 | 13.5 | 3.2 × 105 | 5.0 | 6.4 | 3.1 × 104 | 3.0 | 11.1 | 3.9 × 106 | 6.0 | 13.0 | 3.9 × 106 |
| Enterobacter cloacae | 5.0 | 9.6 | 3.6 × 104 | 11.0 | 14.1 | 3.5 × 106 | 2.0 | 7.4 | 3.0 × 105 | 5.0 | 10.9 | 3.4 × 106 |
| Salmonella spp | 6.0 | 11.5 | 3.4 × 106 | 5.0 | 6.4 | 3.3 × 105 | 4.0 | 14.8 | 3.8 × 105 | 5.0 | 10.9 | 4.1 × 105 |
| Citrobacter freundii | 5.0 | 9.6 | 4.0 × 104 | 9.0 | 11.5 | 4.3 × 105 | 3.0 | 11.1 | 3.9 × 105 | 4.0 | 8.7 | 4.2 × 104 |
| Proteus mirabilis | 6.0 | 11.5 | 3.1 × 104 | 7.0 | 9.0 | 3.4 × 105 | 2.0 | 7.4 | 3.1 × 104 | 3.0 | 6.5 | 3.6 × 105 |
| Pseudomonas aeruginosa | 7.0 | 13.5 | 4.3 × 106 | 10.0 | 12.8 | 4.0 × 108 | 1.0 | 3.7 | 4.1 × 106 | 4.0 | 8.7 | 3.8 × 105 |
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| Total | 52.0 | 100.0 | 78.0 | 100.0 | 27.0 | 100.0 | 46.0 | 100.0 | ||||
*
One insect may simultaneously harbour more than one species of bacteria.
*
Mean Concentration of Gram Negative Bacteria (CFU)