The aim of the this study was to search for bacterial DNA sequences in cholesterol gallstones with negative bacterial culture by NP-PCR technique. Bacterial gene fragments were amplified in vitro from DNA which were extracted from cholesterol gallstones in gallbladder for identifying the existence of bacteria. The gallbladder gallstones of 30 patients were analysed. Bacterial DNA was found in the stones of 26 patients, indicating that most cholesterol gallstones harbor bacterial DNA.
ObjectiveTo get a picture of the distribution of aminoglycoside-resistant genes in pseudomonas aeruginosa in China. MethodsWe electronically searched CBM, CNKI, VIP and WanFang Data for studies that reported aminoglycoside-resistant genes in pseudomonas aeruginosa in China from inception to December 2012. Two reviewers independently screened literature according to the inclusion and exclusion criteria, and extracted data. Then statistical analysis was performed using SPSS 17.0 software. ResultsA total of 1 144 strains of aminoglycoside-resistant pseudomonas aeruginosa from 10 provinces/cities were included. The positive rates of aac(3')-I, aac(3')-Ⅱ, aac(6')-I, aac(6')-Ⅱ, ant(2")-I, ant(3")-I and aph(3')-VI of aminoglycoside modifying enzyme genes were 13.3%, 40.1%, 21.6%, 40.3%, 38.1%, 23.7% and 2.9%, respectively to the north of Huai River, while the rates were 3.2%, 20.2%, 15.9%, 37.6%, 28.3%, 28.5% and 9.1%, respectively to the south of Huai River. The positive rates of rmtA, rmtB and armA of 16S rRNA methylases genes were 20.4%, 19.4% and 0.7%, respectively, while other 16S rRNA methylases genes were not found. ConclusionIn China, aminoglycoside modifying enzyme is the primary mechanism of pseudomonas aeruginosa aminoglycoside-resistant drugs, while 16S rRNA methylation enzyme mechanism is secondary.
ObjectiveTo analyze the microbiological characteristics of airway bacteria in adult patients with bronchiectasis and to analyze their correlation with the clinical features. MethodsPatients diagnosed with bronchiectasis in the Department of Respiratory and Critical Care Medicine of West China Hospital of Sichuan University from October 2017 to April 2018 were classified into the bronchiectasis group, while the control group was those who were found to have pulmonary nodules (diameter less than 10 mm) requiring bronchoscopy by physical examination. All subjects in both groups had not used antibiotics or hormones within 4 weeks and had no other respiratory diseases. Bronchoalveolar lavage fluid (BALF) from the lesion site of the branchial expansion group was collected, and BALF from the basal segment of the contralateral inferior bronchial lobe of the pulmonary nodule was collected in the control group. Bacterial culture and 16S rRNA gene sequencing were performed in both groups. ResultsSeventeen cases and six controls were enrolled in this study and the BALF specimens were collected. Eight cases were in stable period and nine cases were in acute period. The case group was divided into the bacteria-positive group and negative group based on bacterial culture of BALF. Shannon index in the bacteria-positive group was significantly lower than the bacteria-negative group and the control group. And Shannon index showed a negative correlation with positive bacterial culture in BALF. When Shannon index ≤4.5 was used to predict positive bacterial culture, the sensitivity and specificity were 83.3% and 90.9% respectively. The average relative abundance of bacteria was higher and the average sample distribution uniformity was lower in patients with acute period, compared with those in patients with stable period. Shannon index was negatively correlated with the acute exacerbation in patients. When Shannon index <5.0 was used to predict acute exacerbation, the sensitivity and specificity were 77.8% and 100.0%, respectively. ConclusionsShannon index in 16S rRNA gene sequencing results has certain predictive value for acute exacerbation stage. 16S rRNA gene sequencing combined with bacterial culture results can help guide clinicians to provide more precise treatment plans.
Objective To analyze the characteristics of intestinal flora in patients with allergic asthma, so as to provide a theoretical basis for the development of new clinical treatment methods. Methods Fecal samples were collected from 14 patients with allergic asthma and 15 healthy people between January 2021 and December 2021, and 16S rRNA was used to analyze the composition and diversity of intestinal flora of the participants. Results There was no statistically significant difference in age, gender, BMI, or smoking history between the allergic asthma group and the control group (all P>0.05). Alpha diversity results showed that there was significant difference in the abundance of intestinal flora between the two groups, but there was no significant difference in the diversity of intestinal flora between the two groups. The results of β diversity analysis indicated that there were significant differences in the composition of bacterial flora between the allergic asthma group and the control group. The difference bacteria between the two groups at the genus level are Faecalibacterium, Roseburia, Alistipes, Sphingomonas, Dorea, Ruminococcaceae_UCG-002, Streptomyces, [Eubacterium]_venturiosum_group, Butyriococcus and Agathobacter. Conclusion Compared with healthy individuals, patients with allergic asthma have undergone significant changes in the composition of their gut microbiota, with various differential bacteria present. Among them, Roseburia and Eubacterium may be involved in the pathogenesis of allergic asthma through changes in short chain fatty acids.
Objective This study aimed to analyze the differences between the distribution of Traditional Chinese Medicine (TCM) syndrome elements and salivary microbiota between the individuals with pulmonary nodules and those without. Additionally, it seeked to explore the potential correlation between the distribution of Traditional Chinese Medicine (TCM) syndrome elements and salivary microbiota in patients with pulmonary nodules. Methods We retrospectively recruited 173 patients with pulmonary nodules (PN) and 40 healthy controls (HC). The four diagnostic information was collected from all participants, and syndrome differentiation method was used to analyze the distribution of Traditional Chinese Medicine (TCM) syndrome elements in both groups. Saliva samples were obtained from the subjects for 16S rRNA high-throughput sequencing to obtain differential microbiota and to explore the correlation between Traditional Chinese Medicine (TCM) syndrome elements and salivary microbiota in the evolution of the pulmonary nodule disease. Results The study found that in the PN group, the primary Traditional Chinese Medicine (TCM) syndrome elements related to disease location were the lung and liver, and the primary Traditional Chinese Medicine (TCM) syndrome elements related to disease nature were yin deficiency and phlegm. In the HC group, the primary Traditional Chinese Medicine (TCM) syndrome elements related to disease location were the lung and spleen, and the primary Traditional Chinese Medicine (TCM) syndrome elements related to disease nature were dampness and qi deficiency. There were differences between the two groups in the distribution of Traditional Chinese Medicine (TCM) syndrome elements related to disease location (lung, liver, kidney, exterior, heart) and disease nature (yin deficiency, phlegm, qi stagnation, qi deficiency, dampness, blood deficiency, heat, blood stasis) (P<0.05). The species abundance of the salivary microbiota was higher in the PN group than that in the HC group (P<0.05), and there were significant differences in community composition between the two groups (P<0.05). Correlation analysis using multiple methods, including Mantel test network heatmap analysis and Spearman correlation analysis and so on, showed that in the PN group, Prevotella and Porphyromonas were positively correlated with disease location in the lung, and Porphyromonas and Granulicatella were positively correlated with disease nature in yin deficiency (P<0.05). Conclusion The study concludes that there are notable differences in the distribution of Traditional Chinese Medicine (TCM) syndrome elements and the species abundance and composition of salivary microbiota between patients with pulmonary nodules and healthy individuals. The distinct external syndrome manifestations in patients with pulmonary nodules, compared to healthy individuals, may be a cascade event triggered by changes in the salivary microbiota. The dual correlation of Porphyromonas with both disease location and nature suggests that changes in its abundance may serve as an objective indicator for the improvement of symptoms in patients with yin deficiency-type pulmonary nodules.