Volume 23, Number 5—May 2017
Dispatch
Virulence Analysis of Bacillus cereus Isolated after Death of Preterm Neonates, Nice, France, 2013
Romain Lotte, Anne-Laure Hérissé, Yasmina Berrouane, Laurène Lotte, Florence Casagrande, Luce Landraud, Sabine Herbin, Nalini Ramarao, Laurent Boyer
, and Raymond Ruimy
, and Raymond Ruimy
Table 2
Virulence factor analysis of strain characteristics of bacteriologic samples obtained after deaths of 2 preterm neonates with Bacillus cereus infection, Nice, France, 2013*
| Tested strain | Source of sample | Gene |
Genotype group (%) | Nhe production inde)† | Hbl detection limit | |||
|---|---|---|---|---|---|---|---|---|
| cytK1 | cytK2 | ces | hlyII | |||||
| First newborn | Tracheobronchial aspiration | – | + | – | – | III (99.72) | +++ | – |
| Second newborn | Blood culture | – | + | – | – | IV (100) | + | 1/64 |
| Second newborn | Catheter | – | + | – | – | IV (100) | + | 1/64 |
| Environmental isolate 1 | Incubator surface, first newborn | – | – | – | – | II (97.71) | ++ | – |
| Environmental isolate 2 | Incubator surface, first newborn | – | + | – | – | III (99.72) | +++ | – |
| Environmental isolate 3 | Incubator surface, first newborn | – | + | – | + | IV (100) | +++ | 1/64 |
| Environmental isolate 4 | Ultrasonographic probe | – | + | – | – | IV (100) | +++ | 1/32 |
| Environmental isolate 5 | Bench surface used for bottle feeding | – | – | – | – | III (100) | +++ | – |
*Hbl, hemolytic BL toxin; Nhe, nonhemolytic enterotoxin; +, positive; –, negative.
†Nhe production level: +, low; ++ moderate; +++, high.
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