Author | County | Gestation period (Mean, wk) | Publication year | VD | CS | Period for sample collection | Microbial isolation and analysis techniques |
---|---|---|---|---|---|---|---|
[35] | Singapore | 38.87 | 2015 | 57 | 18 | 3d, 3wk, 3Mo, and 6Mo | DNA extraction and 16S rRNA gene amplification |
[36] | India | 36 | 2013 | 73 | 10 | 1d, 2d, 4d, 7d, 14d, 28d, 90d, and 180d | DNA extraction and 16S rRNA gene sequencing |
[27] | Sweden | – | 2013 | 15 | 9 | 1wk, 1Mo, 3Mo, 6Mo, 12Mo and 24Mo | DNA extraction and 16S rRNA gene amplification |
[34] | Greek | 39.05 | 2008 | 34 | 48 | 4d, 30d and 90d | Culture-dependent and molecular methods. |
[21] | Finland | 39.35 | 2008 | 141 | 24 | 1Mo, 3Mo,6Mo, and 12 Mo | Fluorescence in situ hybridization of bacterial cells. |
[20] | Finland | 39.5 | 1999 | 34 | 30 | 3d,5d,10d,30d,60,180d | Cultured on nonselective and selective media |
[26] | Sweden | – | 2014 | 109 | 19 | 6d,3wk,2Mo,6Mo | DNA extraction and 16S rRNA gene sequencing |