[The suicide phenomenon and fermentative metabolic activity in strains of the Aeromonas group isolated from feces].
We study the "suicide" phenomena as well as metabolic pathways of mixed acids (methyl red test, MR) and butylene glycol (Voges-Proskauer, VP), in 107 strains belonging to mesophilic Aeromonas group, isolated from stools. The strains have been identified as A. hydrophila, 28 cases (26.1%), A. sobria 26 cases (24.3%) and A. caviae 53 cases (49.6%). All A. caviae strains behave homogeneously as F+, RM+ and VP-, independently of temperature (30 or 37 degrees C). A. hydrophila strains only showed their trend to "suicide" at 37 degrees C, being this behavior linked to RM test positivity. At 30 degrees C all strains were NS and RM-, keeping always positive the VP test (both temperatures). In A. sobria we have recorded changes in their behavior related to the temperature of incubation. At 37 degrees C, 57.7% were NS, whereas at 30 degrees C, 69.2% showed the same phenotype. The metabolic activity had remained stable, therefore F+ strains were VP and RM+, and NS strains were VP+ and RM-. It seems that FS is a phenotypic behavior of this bacterial group species and temperature-dependent, and also is related to a fermentative metabolic activity modulation of each of them.
Reina
J
J
Servicio de Microbiología Clínica, Hospital Son Dureta, Palma de Mallorca.
Serra
A
A
Borrell
N
N
Gómez
J
J
D000333:Aeromonas / Q000145:classification / Q000302:isolation & purification / Q000378:metabolism* / Q000472:pathogenicity; D001433:Bacteriolysis; D050260:Carbohydrate Metabolism; D005243:Feces / Q000382:microbiology*; D005285:Fermentation; D016905:Gram-Negative Bacterial Infections / Q000382:microbiology; D006801:Humans; D010085:Oxidative Phosphorylation; D013045:Species Specificity; D013696:Temperature; D014774:Virulence
El fenómeno del suicidio y la actividad metabólica fermentativa en las cepas del grupo Aeromonas aisladas en heces.