Table 2.
Sample type | Animal origin | Samples/isolates | Agar media log10 CFU/mL (average ± SDa) |
pH (average ± SDa) | Prevalence S. infantarius subsp. infantarius (and SBSEC members) |
% Sii with lacS/lacZ genes | Reference | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
M17 | SM | MRS | KFS | Samples % |
Isolates % |
||||||||
Sii | Sgm | Sii | Sgm | ||||||||||
Kenya | |||||||||||||
Suusac | Camel | 17/88 | 6.1 ± 0.5C | 6.4 ± 0.9* | n.d. | n.d. | 4.3 ± 0.1(15)* | 94.1 | - | 78.4 | - | 100 | This study |
Suusac | Camel | 15/439 | 8.6 ± 0.4A | 7.3 ± 0.9c | 8.0 ± 0.5A | 8.0 ± 0.8* | 5.1 ± 1.0(15)* | 93.3 | 6.7 | 62.8 | 0.4 | 100 | Jans (2011); Jans et al. (2012a); Wullschleger (2009) |
Sour milk mala | Cow | 1/5 | 6.2* | 5.8* | n.d. | n.d. | 5.5(1)* | 100.0 | - | 20.0 | - | 100 | This study |
Somalia | |||||||||||||
Suusac | Camel | 11/192 | 8.5 ± 0.1* | 5.8 ± 0.7c* | 8.4 ± 0.5A | 5.6 ± 2.5* | 4.5 ± 0.2(11)* | 72.7 | 45.5 | 19.8 | 4.2 | 100 | Jans (2011); Jans et al. (2012a); Wullschleger (2009) |
Sour milk | Goat | 1/27 | 8.3 ± 0.1* | 6.6 ± 0.0* | 8.3 ± 0.0* | 5.9 ± 0.5* | 5.1(1)* | 100.0 | - | 11.1 | - | This study and Wullschleger (2009) | |
Côte d’Ivoire | |||||||||||||
Sour milk (June) | Cow | 31/151 | 9.0 ± 1.0* | n.d.b | n.d. | n.d. | 4.5 ± 0.2(31)* | 32.3 | - | 20.5 | - | 25.8 | This study |
Sour milk (Dec/Jan) | Cow | 45/94 | 7.9 ± 0.7B | n.d.b | n.d. | n.d. | 5.5 ± 0.1(45)* | 40.0d | 6.7 d | 27.7 | 5.3 | 65.4 | This study |
Mali | |||||||||||||
Fènè | Cow | 19/57 | n.d. | 6.5 ± 1.8* | n.d. | n.d. | 4.8 ± 1.2(19)* | 36.8 | 31.6 | 19.3 | 21.1 | 55.5 | Wullschleger (2009) |
Sudan | |||||||||||||
Gariss | Camel | 9/180 | 8.0 ± 0.4B | n.d. | 8.2 ± 0.3A | n.d. | 4.0 ± 0.2(9) | 100.0 | - | 68.3 | - | n.d. | Abdelgadir et al. (2008) |
Sii: S. infantarius subsp. infantarius; Sgm: S. gallolyticus subsp. macedonicus; a) SD: standard deviation; superscript figure in brackets = number of pH measurements; b) SM agar media not used as explained in Section 3.2; c) determined from 2 (Kenya) and 5 (Somalia) selected samples (Wullschleger, 2009); d) based on the following calculation: 17 samples with Sii only, 2 samples with Sgm only, 1 sample with Sii + Sgm yielding 18 (40.0%) with Sii and 3 (6.7%) with Sgm and a total of 20 (44.4%) positive for SBSEC; n.d.: not determined; “–” below detection limit. Statistics comment: *) samples not normally distributed according to Shapiro–Wilk test (alpha = 0.05) were excluded from t-test and analyzed in a pair-wise Kruskal–Wallis test (alpha = 0.05). Values per column M17, SM, MRS, KFS and pH not connected by the same capital (A, B, C) letter are significantly different (t test, alpha = 0.05).