Which of the following scenarios is not acceptable for a request for culture for recovery of Listeria monocytogenes?

A) Placenta culture from a 29 year old female who delivered a stillborn male at 20 weeks gestation
B) Vaginal swab from a 27 year old, non-pregnant female
C) Vaginal culture from a 33 year old female, at 30 weeks gestation, complaining of flu-like symptoms
D) Amniotic fluid from a 31 year old female, at 19 weeks gestation, presenting with fever

B