Salmonella enterica serovar Typhimurium (S. Typhimurium [STM]) is a leading cause of nontyphoidal salmonellosis (NTS) worldwide. The pathogenesis of NTS has been studied extensively using a streptomycinpretreated mouse colitis model with the limited numbers of laboratory STM strains. However, the pathogenicity of the clinically isolated STM (STMC) strains endemic in Thailand in mice has not been explored. The aim of this study was to compare the pathogenicity of STMC strains collected from Northern Thailand with the laboratory STM (IR715) in mice. Five STMC isolates were obtained from the stool cultures of patients with acute NTS admitted to Maharaj Nakorn Chiang Mai Hospital in 2016 and 2017. Detection of virulence genes and sequence type (ST) of the strains was performed. Female C57BL/6 mice were pretreated with streptomycin sulfate 1 day prior to oral infection with STM. On Day 4 postinfection, mice were euthanized, and tissues were collected to analyze the bacterial numbers, tissue inflammation, and cecal histopathological score. We found that all five STMC strains are ST34 and conferred the same or

The intestinal bacterial flora of febrile neutropenic patients has been found to be significantly diverse. However, there are few reports of alterations of in adult acute myeloid leukemia (AML) patients. Stool samples of each treatment-naïve AML patient were collected the day before initiation of induction chemotherapy (pretreatment), on the first date of neutropenic fever and first date of bone marrow recovery. Bacterial DNA was extracted from stool samples and bacterial 16s ribosomal RNA genes were sequenced by next-generation sequencing. Relative abundance, overall richness, Shannon's diversity index and Simpson's diversity index were calculated. No antimicrobial prophylaxis was in placed in all participants. Ten cases of AML patients (4 male and 6 female) were included with a median age of 39 years (range: 19–49) and all of patients developed febrile neutropenia. Firmicutes dominated during the period of neutropenic fever, subsequently declining after bone marrow recovery a pattern in contrast to that shown by Bacteroidetes and Proteobacteria. Enterococcus was more abundant in the febrile neutropenia period compared to pretreatment (mean difference +20.2; p < 0.0001) while Escherichia notably declined during the same period (mean difference -11.2; p = 0.0064). At the operational taxonomic unit (OTU) level, there was a significantly higher level of overall richness in the pretreatment period than in the febrile neutropenic episode (mean OTU of 203.1 vs. 131.7; p = 0.012). Both of the diversity indexes of Shannon and Simpson showed a significant decrease during the febrile neutropenic period. Adult AML patients with a first episode of febrile neutropenia after initial intensive chemotherapy demonstrated a significant decrease in gut microbiota diversity and the level of diversity remained constant despite recovery of bone marrow.

No abstract

AbstractIntestinal bacterial flora of febrile neutropenic patients had significantly diverse. However, there were scanty reports of microbiota alteration of adult patients with acute myeloid leukemia (AML). Stool samples of each treatment-naïve AML patient were collected at the day before induction chemotherapy initiation (pretreatment), first day of neutropenic fever and first day of bone marrow recovery. Bacterial DNA was extracted from stool and sequenced bacterial 16s ribosomal RNA genes by next-generation sequencing. Relative abundance, overall richness, Shannon’s diversity index and Simpson’s diversity index were calculated. Ten cases of AML patients (4 men and 6 women) were included with median age of 39 years (range: 19-49) and all of patients developed febrile neutropenia. Firmicutes were dominated over the period of neutropenic fever and subsequent declined after bone marrow recovery contrast to Bacteroidetes and Proteobacteria. Enterococcus was more abundant at febrile neutropenia period compared to pretreatment while Bacteroides and Escherichia was notably declined during the febrile neutropenia. At the operational taxonomic units (OTUs) level, there was significant higher level of overall richness of pretreatment period than febrile neutropenic episode. Both of the diversity indexes of Shannon and Simpson were considerably decreased at febrile neutropenic period. Adult AML patients with first episode of febrile neutropenia after initial intensive chemotherapy demonstrated the significant decrease of gut microbiota diversity and the level of diversity consistently remained constant despite of bone marrow recovery.

Background : The intestinal bacterial flora of febrile neutropenic patients has been found to be significantly diverse and may play a role in clinical decisions regarding antimicrobial de-escalation with predictive complications. However, there are few reports of microbiota alteration of adult acute myeloid leukemia (AML) patients. Methods : Stool samples of each treatment-naïve AML patient were collected the day before the initiation of induction chemotherapy (pretreatment), on the first date of neutropenic fever and first date of bone marrow recovery. Bacterial DNA was extracted from stool samples and bacterial 16s ribosomal RNA genes were sequenced by next-generation sequencing. Relative abundance, overall richness, Shannon's diversity index and Simpson's diversity index were calculated. Results : Ten AML patients (4 men and 6 women) were included with a median age of 39 years (range: 19-49). Twenty-four stool samples were collected and assigned into three groups: (1) pretreatment (n = 10); (2) first date of febrile neutropenia (n=9); and (3) first date of bone marrow recovery (n=5). All of patients developed febrile neutropenia; three patients had detectable infectious organisms and all of these cases had invasive pulmonary aspergillosis with two being co-infected with Pseudomonas pneumonia and Escherichia coli septicemia. Median absolute neutrophil count was 2.85 x 109/L (range: 1.42-7.67 x 109/L), 0.04 x 109/L (range: 0.01-0.43 x 109/L) and 3.65 x 109/L (range: 2.09-5.78 x 109/L) at pretreatment, first date of febrile neutropenia and first date of bone marrow recovery, respectively. At the phylum level, Firmicutes dominated over the period of neutropenic fever, subsequently declining after bone marrow recovery a pattern in contrast to that shown by Bacteroidetes and Proteobacteria. At the genus level, Enterococcus was more abundant in the febrile neutropenia period compared to pretreatment (mean difference of 20.2, [95%CI (5.9, 34.6)]; P &lt;0.01) whileBacteroides and Escherichia notably declined during the same period (mean difference of -11.7, [95%CI (-21.9, -1.4)]; P= 0.027 and -11.6, [95%CI (-22.7, -0.4)]; P = 0.034, respectively). At the operational taxonomic units (OTUs) level, there was a significantly higher level of overall richness in the pretreatment period than in the febrile neutropenic episode (mean OTUs of 203.1 vs. 131.7; P = 0.012). Both of the diversity indexes of Shannon and Simpson showed a significant decrease in the febrile neutropenic period. Conclusions : Adult AML patients with a first episode of febrile neutropenia after initial intensive chemotherapy demonstrated a significant decrease in gut microbiota diversity and the level of diversity remained constant despite recovery of bone marrow. Figure Disclosures No relevant conflicts of interest to declare.