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J Clin Microbiol. 2002 Sep;40(9):3346-9.

Leptotrichia amnionii sp. nov., a novel bacterium isolated from the amniotic fluid of a woman after intrauterine fetal demise.

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  • 1Clinical Research Center, Marshfield Medical Research and Education Foundation, Wisconsin 54449, USA.


A novel bacterium was isolated and characterized from the amniotic fluid of a woman who experienced intrauterine fetal demise in the second trimester of pregnancy. The bacterium was a slow-growing, gram-negative anaerobic coccobacillus belonging to the genus LEPTOTRICHIA: Unlike Leptotrichia sanguinegens, the isolate did not grow in chopped-meat glucose broth or on sheep blood agar upon subculturing. The isolate was characterized by sequencing and analyzing its 16S rRNA gene. The 1,493-bp 16S ribosomal DNA sequence had only 96% homology with L. sanguinegens. Several phylogenetic analyses indicated that L. amnionii is a distinct species and most closely related to L. sanguiegens.

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