Table 7.
Serogroup distribution of different L. monocytogenes isolates from food-processing plants in this study and literature. Table shows the number and percentage of strains belonging to each serogroup and human-listeriosis-related serogroups. The geographical origin and the type of food matrices analyzed in each reference are shown. Serogroup distributions were analyzed using the chi-square statistical test, and p-values from the analysis are shown. Values of p > 0.05 (underlined and bold) indicate no significant differences between studies.
| Reference/Serogroup | IIa | IIb | IIc | IVa | IVb | IIa + IIb + IIc + IVb | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| This study (Meat/Basque Country, Spain) | 5 (20%) | 11 (44%) | 3 (12%) | 1 (4%) | 5 (20%) | 24 (96%) | ||||
| Pork/Spain [42] | 240 (56%) | 63 (15%) | 105 (24%) | 0 (0%) | 23 (5%) | 431 (100%) | ||||
| Pork/Spain [43] | 43 (74%) | 7 (12%) | 7 (12%) | 0 (0%) | 1 (2%) | 58 (100%) | ||||
| Meat/China [13] | 55 (45%) | 24 (19%) | 35 (29%) | 0 (0%) | 9 (7%) | 123 (100%) | ||||
| Poultry/Castilla y Leon, Spain [44] | 39 (27%) | 2 (1%) | 102 (69%) | 0 (0%) | 4 (3%) | 147 (100%) | ||||
| Meat/Poland [45] | 36 (51%) | 10 (15%) | 15 (21%) | 0 (0%) | 9 (13%) | 70 (100%) | ||||
| Meat, Dairy/Romania [12] | 7 (44%) | 3 (19%) | 2 (12%) | 0 (0%) | 4 (25%) | 16 (100%) | ||||
| Dairy/Castilla y Leon, Spain [46] | 33 (72%) | 6 (13%) | 2 (4%) | 0 (0%) | 5 (11%) | 46 (100%) | ||||
| Meat, dairy, fish, vegetables/France [11] | 68 (77%) | 9 (10%) | 11 (12%) | 0 (0%) | 1 (1%) | 89 (100%) | ||||
| Meat, fish, vegetables/Spain [38] | 24 (69%) | 2 (6%) | 6 (17%) | 0 (0%) | 3 (8%) | 35 (100%) | ||||
| Χ2 Analysis | This Study | [42] | [43] | [13] | [44] | [45] | [12] | [46] | [11] | [38] |
| This study | ||||||||||
| [42] | 1.23·10−8 | |||||||||
| [43] | 3.53·10−5 | 0.046 | ||||||||
| [13] | 0.13·10−2 | 0.403 | 0.011 | |||||||
| [44] | 6.90·10−16 | 1.49·10−21 | 5.08·10−13 | 7.61·10−12 | ||||||
| [45] | 0.5·10−2 | 0.124 | 0.024 | 0.288 | 4.45·10−11 | |||||
| [12] | 0.197 | 0.25·10−2 | 0.001 | 0.015 | 2.11·10−5 | 0.276 | ||||
| [46] | 0.16·10−2 | 0.91·10−2 | 0.137 | 0.004 | 1.20·10−13 | 0.055 | 0.035 | |||
| [11] | 1.5·10−7 | 0.98·10−2 | 0.246 | 0.12·10−2 | 7.28·10−10 | 0.003 | 0.75·10−3 | 0.51·10−2 | ||
| [38] | 0.95·10−3 | 0.027 | 0.32·10−2 | 0.066 | 0.12·10−2 | 0.372 | 0.849 | 0.013 | 0.19·10−2 | |