Table 1. Prevalence of bacteria isolated from corneal scrapes.
| Bacteria | First period n (%) | Second period n (%) | All 10 years n (%) | P-value |
|---|---|---|---|---|
| Gram-positive cocci | 66 (47.5) | 60 (46.9) | 126 (47.2) | 0.921 |
| Coagulase-negative Staphylococci | 28 (20.1) | 41 (32.0) | 69 (25.8) | 0.027* |
| MSSA | 22 (15.8) | 11 (8.6) | 33 (12.4) | 0.073 |
| MRSA | 4 (2.9) | 1 (0.8) | 5 (1.9) | 0.372 |
| Streptococcus pneumoniae | 5 (3.6) | 3 (2.3) | 8 (3.0) | 0.724 |
| α-haemolytic Streptococci | 3 (2.2) | 2 (1.6) | 5 (1.9) | 1.000 |
| Enterococcus faecalis | 1 (0.7) | 1 (0.8) | 2 (0.7) | 1.000 |
| ‘Viridans' Streptococci | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Streptococcus pyogenes | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Other Streptococcus spp. | 1 (0.7) | 1 (0.8) | 2 (0.7) | 1.000 |
| Gram-positive bacilli | 12 (8.6) | 7 (5.5) | 19 (7.1) | 0.350 |
| Corynebacterium spp. | 9 (6.5) | 7 (5.5) | 16 (6.0) | 0.930 |
| Propionibacterium spp. | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Bacillus spp. | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Other Gram-positive bacilli | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Gram-negative cocci | 5 (3.6) | 5 (3.9) | 10 (3.7) | 1.000 |
| Moraxella catarrhalis | 4 (2.9) | 3 (2.3) | 7 (2.6) | 1.000 |
| Other Moraxella spp. | 1 (0.7) | 2 (1.6) | 3 (1.1) | 0.609 |
| Gram-negative bacilli | 56 (40.3) | 56 (43.8) | 112 (41.9) | 0.567 |
| Pseudomonas aeruginosa | 29 (20.9) | 36 (28.1) | 65 (24.3) | 0.167 |
| Other Pseudomonas spp. | 7 (5.0) | 4 (3.1) | 11 (4.1) | 0.634 |
| Serratia marcescens | 2 (1.4) | 0 (0) | 2 (0.7) | 0.499 |
| Serratia liquefaciens | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Other Serratia spp. | 2 (1.4) | 0 (0) | 2 (0.7) | 0.499 |
| Haemophilus influenzae | 2 (1.4) | 0 (0) | 2 (0.7) | 0.499 |
| Escherichia coli | 1 (0.7) | 1 (0.8) | 2 (0.7) | 1.000 |
| Acinetobacter lwoffii | 2 (1.4) | 0 (0) | 2 (0.7) | 0.499 |
| Other Acinetobacter spp. | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Proteus mirabilis | 0 (0) | 1 (0.8) | 1 (0.4) | 0.479 |
| Pasteurella multocida | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Klebsiella spp. | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Aeromonas spp. | 1 (0.7) | 0 (0) | 1 (0.4) | 1.000 |
| Other Gram-negative bacilli | 6 (4.3) | 14 (10.9) | 20 (7.5) | 0.061 |
| Total | 139 | 128 | 267 |
Abbreviations: MSSA, Methicillin-sensitive Staphylococcus aureus; MRSA, Methicillin-resistant Staphylococcus aureus.
The final column (P-value) shows the statistical significance of two-tailed χ2 or Fisher exact tests comparing data from the First and Second study periods.
*P<0.05.