1.Genomic characteristics and phylogenetic analyses of enteroaggregative Escherichia coli infection in diarrhea outpatients in Pudong New Area, Shanghai
Qiqi CUI ; Yuchen LU ; Suping WU ; Yinwen ZHANG ; Bing ZHAO ; Lifeng PAN ; Yingjie ZHENG ; Lipeng HAO
Shanghai Journal of Preventive Medicine 2025;37(4):342-349
ObjectiveTo investigate the whole genomic characteristics and phylogenetic relationships of clinical isolates of enteroaggregative Escherichia coli (EAEC) in diarrhea outpatients in Pudong New Area, Shanghai. MethodsBased on the diarrheal disease surveillance network in Pudong New Area, Shanghai, whole-genome sequencing was performed on a total of 55 EAEC strains isolated from fecal samples of the diarrhea outpatients from January 2015 to December 2019. The genome analyses based on raw sequencing data encompassed genome size, coding genes, dispersed repeat sequences, genomic islands, and protein coding regions, and pan-genome analyses were conducted simultaneously. Contigs sequences assays were performed to analyze molecular characteristics including serotypes, antibiotic resistance genes, and virulence factors. The phylogenetic clusters and multilocus sequence typing (MLST) were identified, and a phylogenetic tree was constructed. ResultsEAEC exhibited an open pan-genome. The predominant serotype of EAEC in diarrhea outpatients in Pudong New Area was O130:H27, and the carriage rate of β-lactam resistance genes was the highest (67.27%, 37/55). A total of 29 virulence factors and 106 virulence genes were identified, phylogenic group B1 was the predominant group, and clonal group CC31 was the dominant clonal group. The strain distribution was highly heterogeneous. ConclusionThe genomic characteristics of EAEC displayed significant strain polymorphism. It is necessary to develop effective strategies for differential diagnosis and improve detection capabilities for infection with EAEC of different serotypes and genotypes.
2.Therapeutic Effect of Cranial Painkiller Pills' Extract Powder in Treatment of Trigeminal Neuralgia Induced by Injection of Talci Pulvis into Infraorbital Foramen of Model Rats Based on OTULIN-regulated Neuroinflammation
Shuran LI ; Xinwei WANG ; Jing SUN ; Dan XIE ; Ronghua ZHAO ; Lei BAO ; Zihan GENG ; Qiyue SUN ; Jingsheng ZHANG ; Yaxin WANG ; Xihe CUI ; Xinying LI ; Bing HAN ; Tianjiao LU ; Xiaolan CUI ; Liying LIU ; Shanshan GUO
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(21):21-28
ObjectiveThis paper aims to verify the therapeutic effect of Cranial Painkiller pills' extract powder prepared by the new process on the rat's trigeminal neuralgia model caused by infraorbital injection of Talci Pulvis, evaluate its potential clinical application value, and compare the therapeutic effect with that of Cranial Painkiller granules, so as to provide data support for the application of the Cranial Painkiller pills' extract powder and precise treatment. MethodsThe rat's trigeminal neuralgia model was constructed by infraorbital injection of Talci Pulvis, and the rats were randomly divided into the normal group, model group, carbamazepine group (60 mg·kg-1), Cranial Painkiller granules group (2.70 g·kg-1), and low, medium, and high dosage groups of Cranial Painkiller pills' extract powder (1.35, 2.70, 5.40 g·kg-1) according to the basal mechanical pain thresholds, and there were 10 rats in each group. The drug was administered by gavage to each group 2 h after modeling, and distilled water was given by gavage to the normal and model groups under the same conditions once a day for 10 d. Von Frey brushes were used to measure mechanical pain thresholds in rats. Hematoxylin-eosin (HE) staining was used to detect pathological changes in the trigeminal ganglion, and enzyme-linked immunosorbent assay (ELISA) was used to detect the inflammatory factors interleukin-1 (IL-1), interleukin-6 (IL-6), interleukin-8 (IL-8), and tumor necrosis factor-α (TNF-α) levels in rat serum, as well as neuropeptide substance P (SP) and β-endorphin (β-EP) levels in rat brain tissue. Western blot technique was used to detect the levels of NLRP3, ASC, Caspase-1, and OTULIN proteins in rat brain tissue. ResultsCompared with the normal group, the pain threshold of rats in the model group showed a continuous significant decrease (P<0.01). The pathological damage of brain tissue was significant (P<0.01), and the inflammatory levels of IL-1, IL-6, IL-8, and TNF-α in serum were significantly elevated (P<0.01). The level of the SP in the brain tissue was significantly elevated (P<0.01), and the level of β-EP was significantly reduced (P<0.01), while the level of OTULIN was significantly reduced, and NLRP3, ASC, and Caspase-1 protein levels were significantly elevated (P<0.01). After administration of the drug, compared with the model group, the pain threshold of each dose group of the Cranial Painkiller pills' extract powder and the Cranial Painkiller granules group significantly increased (P<0.01). The inflammatory levels of IL-1, IL-6, IL-8, and TNF-α and SP levels significantly decreased (P<0.01), and the β-EP levels were significantly elevated (P<0.01), while the levels of OTULIN protein were significantly elevated (P<0.05, P<0.01), and the levels of NLRP3, ASC proteins were decreased (P<0.01)in high dose Cranial Painkiller pills' extract powder. Meanwhile, compared with those in the model group, the trigeminal ganglion lesions of rats in the Cranial Painkiller pills' extract powder and Cranial Painkiller granules groups showed different degrees of improvement (P<0.05, P<0.01). ConclusionThe Cranial Painkiller pills' extract powder has significant therapeutic effects on the rat model of trigeminal neuralgia induced by infraorbital injection of Talci Pulvis, and its mechanism is related to the improvement of OTULIN-regulated neuroinflammation.
3.Therapeutic Effect of Cranial Painkiller Pills' Extract Powder in Treatment of Trigeminal Neuralgia Induced by Injection of Talci Pulvis into Infraorbital Foramen of Model Rats Based on OTULIN-regulated Neuroinflammation
Shuran LI ; Xinwei WANG ; Jing SUN ; Dan XIE ; Ronghua ZHAO ; Lei BAO ; Zihan GENG ; Qiyue SUN ; Jingsheng ZHANG ; Yaxin WANG ; Xihe CUI ; Xinying LI ; Bing HAN ; Tianjiao LU ; Xiaolan CUI ; Liying LIU ; Shanshan GUO
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(21):21-28
ObjectiveThis paper aims to verify the therapeutic effect of Cranial Painkiller pills' extract powder prepared by the new process on the rat's trigeminal neuralgia model caused by infraorbital injection of Talci Pulvis, evaluate its potential clinical application value, and compare the therapeutic effect with that of Cranial Painkiller granules, so as to provide data support for the application of the Cranial Painkiller pills' extract powder and precise treatment. MethodsThe rat's trigeminal neuralgia model was constructed by infraorbital injection of Talci Pulvis, and the rats were randomly divided into the normal group, model group, carbamazepine group (60 mg·kg-1), Cranial Painkiller granules group (2.70 g·kg-1), and low, medium, and high dosage groups of Cranial Painkiller pills' extract powder (1.35, 2.70, 5.40 g·kg-1) according to the basal mechanical pain thresholds, and there were 10 rats in each group. The drug was administered by gavage to each group 2 h after modeling, and distilled water was given by gavage to the normal and model groups under the same conditions once a day for 10 d. Von Frey brushes were used to measure mechanical pain thresholds in rats. Hematoxylin-eosin (HE) staining was used to detect pathological changes in the trigeminal ganglion, and enzyme-linked immunosorbent assay (ELISA) was used to detect the inflammatory factors interleukin-1 (IL-1), interleukin-6 (IL-6), interleukin-8 (IL-8), and tumor necrosis factor-α (TNF-α) levels in rat serum, as well as neuropeptide substance P (SP) and β-endorphin (β-EP) levels in rat brain tissue. Western blot technique was used to detect the levels of NLRP3, ASC, Caspase-1, and OTULIN proteins in rat brain tissue. ResultsCompared with the normal group, the pain threshold of rats in the model group showed a continuous significant decrease (P<0.01). The pathological damage of brain tissue was significant (P<0.01), and the inflammatory levels of IL-1, IL-6, IL-8, and TNF-α in serum were significantly elevated (P<0.01). The level of the SP in the brain tissue was significantly elevated (P<0.01), and the level of β-EP was significantly reduced (P<0.01), while the level of OTULIN was significantly reduced, and NLRP3, ASC, and Caspase-1 protein levels were significantly elevated (P<0.01). After administration of the drug, compared with the model group, the pain threshold of each dose group of the Cranial Painkiller pills' extract powder and the Cranial Painkiller granules group significantly increased (P<0.01). The inflammatory levels of IL-1, IL-6, IL-8, and TNF-α and SP levels significantly decreased (P<0.01), and the β-EP levels were significantly elevated (P<0.01), while the levels of OTULIN protein were significantly elevated (P<0.05, P<0.01), and the levels of NLRP3, ASC proteins were decreased (P<0.01)in high dose Cranial Painkiller pills' extract powder. Meanwhile, compared with those in the model group, the trigeminal ganglion lesions of rats in the Cranial Painkiller pills' extract powder and Cranial Painkiller granules groups showed different degrees of improvement (P<0.05, P<0.01). ConclusionThe Cranial Painkiller pills' extract powder has significant therapeutic effects on the rat model of trigeminal neuralgia induced by infraorbital injection of Talci Pulvis, and its mechanism is related to the improvement of OTULIN-regulated neuroinflammation.
4.Association between incidence of hand-foot-mouth disease and meteorological factors
YANG Ya ; FEI Jie ; YANG Yiwei ; ZHANG Bing ; ZHANG Qian ; LU Yihan
Journal of Preventive Medicine 2025;37(4):346-349,355
Objective:
To examine the association between incidence of hand-foot-mouth disease (HFMD) and meteorological factors, so as to provide the basis for the prevention and control of HFMD.
Methods:
The number of HFMD cases in Jiading District, Shanghai Municipality from 2016 to 2023 were collected through the Chinese Disease Prevention and Control Information System, and meteorological data were obtained from the Shanghai Meteorological Bureau. The associations of daily average temperature, daily average relative humidity, and daily average atmospheric pressure with the daily number of HFMD cases were analyzed using a distributed lag non-linear model (DLNM).
Results:
A total of 21 555 HFMD cases were reported in Jiading District from 2016 to 2023, with an average annual incidence of 132.57/100 000. There were 12 762 male cases (59.21%) and 8 793 female cases (40.79%). The main peak of incidence occurred from June to August, and the secondary peak was from October to December. DLNM analysis showed that the incidence risk of HFMD first increased and then decreased with the increase of daily average temperature, and first decreased and then increased with the prolongation of the lag time. The cumulative lag risk was higher when the daily average temperature ranged from 18.4 to 35.1 ℃, and the maximum cumulative lag effect was observed at 27.8 ℃ (RR=5.522, 95%CI: 4.751-6.370). The incidence risk of HFMD first increased and then decreased with the increase of daily average relative humidity, and first decreased, then increased and then decreased again with the prolongation of the lag time. The cumulative lag risk was higher when the daily average relative humidity ranged from 71.7% and 90.8%, and the maximum cumulative lag effect was observed at 81.8% (RR=1.603, 95%CI: 1.321-1.995). The incidence risk of HFMD decreased with the increase of daily average atmospheric pressure, and decreased with the prolongation of the lag time when the daily average atmospheric pressure was greater than 1 015.80 hPa. When the daily average atmospheric pressure was less than 1 015.80 hPa, the incidence risk of HFMD increased with the prolongation of the lag time. The maximum cumulative lag effect was observed at 986.80 hPa (RR=8.513, 95%CI: 1.401-36.625).
Conclusion
The incidence risk of HFMD in Jiading District initially increases and then decreases with increasing temperature and relative humidity, while it decreases with increasing atmospheric pressure, and these effects exhibit a lagged response.
5. Association between index finger and ring finger length ratios and polymorphism of homeobox A11 gene locus among Ningxia college students
Meng-Yi YANG ; Shi-Bo NIU ; Jing ZHANG ; Jie DANG ; Zhan-Bing MA ; Hong LU ; Zheng-Hao HUO
Acta Anatomica Sinica 2024;55(1):62-66
Objective To investigate the association between the index finger and ring finger length ratio (2D ∶ 4D) and of four loci (rs6461992‚ rs6968828‚ rs7801581‚ rs17427875) polymorphism of homeobox (HOX) A11 gene among Ningxia college students. Methods Digit camera was used to collect frontal hand photos of 667 Han college students (348 males and 319 females) from Ningxia province; Image analysis software was used to mark the anatomical points and measure finger lengths of the index and ring fingers of both hands; multiplex PCR was used to detect each locus polymorphisms of HOXA11 gene; statistical software was used to compare and analyze the differences and associations of 2D ∶4D and gene polymorphisms between different genders. Results Among Ningxia Han college students‚ both left hand and right hand 2D ∶ 4D were significantly higher in females than those of in males (all P< 0. 05)‚ and there were no significant sex differences in right-left hand 2D ∶4D; the genotypes and allele frequencies of rs7801581 locus of HOXA11 gene differed significantly between genders (all P < 0. 05)‚ and none of the other locus polymorphisms showed any significant sex differences; only female left hand 2D ∶4D was significantly associated with rs6461992 locus genotype in the relationship between 2D ∶4D and HOXA11 polymorphisms (P<0. 05). Conclusion There were significant sex differences in 2D ∶ 4D among Han college students in Ningxia‚ and the rs6461992 locus polymorphism of HOXA11 gene may be associated with the formation of 2D ∶4D in females.
6.Association between index-ring finger length ratio and polymorphisms of 6 phalange-bone development related genes
Meng-Yi YANG ; Shi-Bo NIU ; Jing ZHANG ; Liang PENG ; Jie DANG ; Zhan-Bing MA ; Hong LU ; Zheng-Hao HUO
Acta Anatomica Sinica 2024;55(2):181-187
Objective To investigate the association of 13 single nucleotide polymorphism(SNP)sites in 6 phalange-bone development related genes[fibroblast growth factor receptor 2(FGFR2),indian hedgehog signaling molecule(IHH),Msh homeobox 1(MSX1),Runx family transcription factor 2(RUNX2),SRY-box transcription factor 9(SOX9),Wnt family member 5A(WNT5A)]with human index-ring finger length ratio(2D∶4D).Methods Digital cameras were used to take frontal photographs of the hands of 731 college students(358 males and 373 females)in Ningxia,and image analysis software was used to mark anatomical points and measure finger lengths of index(2th)and ring(4th);genotyping of 13 SNP sites(rs1047057,rs755793,rs41258305,rs3731881,rs3100776,rs12532,rs3821949,rs45585135,rs3749863,rs1042667,rs12601701,rs1829556,rs3732750)for 6 genes by multiplex PCR;One-Way ANOVA or independent sample t-test indirectly assessed the association between 2D∶4D and 13 SNP sites.Results Both left and right hand 2D∶4D were significantly higher in females than males in Ningxia college students(all P<0.01);no statistically significant differences in genotype and allele frequencies of the 13 SNP sites among different sexes(all P>0.05);among different sexes,male left hand 2D∶4D was significantly associated with the genotype of SOX9 gene rs12601701 site(P<0.05)and right hand 2D∶4D was significantly associated with the genotype of WNT5A gene rs1829556 site(P<0.05);the female right hand 2D∶4D was significantly associated with the MSX1 gene rs12532(P<0.01)and rs3821949(P<0.05)sites genotypes.Conclusion SOX9(rs12601701),WNT5A(rs1829556)and MSX1(rs12532 and rs3821949)gene polymorphisms may be associated with the formation of 2D∶4D in Ningxia population.
7.An Enhancer LncRNA Regulates NFE2 Expression and Proliferation in Human Leukemic K562 Cells
Yan-Fei LU ; Song-Ya QU ; Jing-Jing ZHU ; Chao LIU ; Jian WANG ; Bing-She HAN ; Jun-Fang ZHANG
Progress in Biochemistry and Biophysics 2024;51(1):190-201
ObjectiveTranscription factor NFE2 was observed abnormal expression in myeloproliferative neoplasm (MPN) patients. However, how NFE2 is transcriptionally regulated remains ambiguous. This study aims to explore the elements and molecular mechanisms involved in the transcriptional regulation of NFE2. MethodsActive enhancers were predicted by public NGS data and conformed experimentally via dual luciferase reporter assay. After that, PRO-seq and GRO-seq data was used to detect enhancer RNAs transcribed from these enhancers. RACE was utilized to clone the full length enhancer RNA (eRNA) transcripts, and RT-qPCR was used to measure their expression in different leukemia cell lines as well as the transcript levels during induced differentiation. Finally, to investigate the molecular function of the eRNA, overexpression and knockdown of the eRNA via lentivirus system was performed in K562 cells. ResultsWe identified three enhancers regulating NFE2 transcription, which located at -3.6k, -6.2k and +6.3k from NFE2 transcription start site (TSS) respectively. At the -3.6k enhancer, we cloned an eRNA transcript and characterized that as a lncRNA which was expressed and located in the nucleus in three types of leukemia cell lines. When this lncRNA was overexpressed, expression of NFE2 was upregulated and decreases of K562 cell proliferation and migration ability were observed. While knocking down of this lncRNA, the level of NFE2 decreases correspondingly and the proliferation ability of K562 cells increases accordingly. ConclusionWe identified an enhancer lncRNA that regulates NFE2 transcription positively and suppresses K562 cell proliferation.
8.Experts consensus on standard items of the cohort construction and quality control of temporomandibular joint diseases (2024)
Min HU ; Chi YANG ; Huawei LIU ; Haixia LU ; Chen YAO ; Qiufei XIE ; Yongjin CHEN ; Kaiyuan FU ; Bing FANG ; Songsong ZHU ; Qing ZHOU ; Zhiye CHEN ; Yaomin ZHU ; Qingbin ZHANG ; Ying YAN ; Xing LONG ; Zhiyong LI ; Yehua GAN ; Shibin YU ; Yuxing BAI ; Yi ZHANG ; Yanyi WANG ; Jie LEI ; Yong CHENG ; Changkui LIU ; Ye CAO ; Dongmei HE ; Ning WEN ; Shanyong ZHANG ; Minjie CHEN ; Guoliang JIAO ; Xinhua LIU ; Hua JIANG ; Yang HE ; Pei SHEN ; Haitao HUANG ; Yongfeng LI ; Jisi ZHENG ; Jing GUO ; Lisheng ZHAO ; Laiqing XU
Chinese Journal of Stomatology 2024;59(10):977-987
Temporomandibular joint (TMJ) diseases are common clinical conditions. The number of patients with TMJ diseases is large, and the etiology, epidemiology, disease spectrum, and treatment of the disease remain controversial and unknown. To understand and master the current situation of the occurrence, development and prevention of TMJ diseases, as well as to identify the patterns in etiology, incidence, drug sensitivity, and prognosis is crucial for alleviating patients′suffering.This will facilitate in-depth medical research, effective disease prevention measures, and the formulation of corresponding health policies. Cohort construction and research has an irreplaceable role in precise disease prevention and significant improvement in diagnosis and treatment levels. Large-scale cohort studies are needed to explore the relationship between potential risk factors and outcomes of TMJ diseases, and to observe disease prognoses through long-term follw-ups. The consensus aims to establish a standard conceptual frame work for a cohort study on patients with TMJ disease while providing ideas for cohort data standards to this condition. TMJ disease cohort data consists of both common data standards applicable to all specific disease cohorts as well as disease-specific data standards. Common data were available for each specific disease cohort. By integrating different cohort research resources, standard problems or study variables can be unified. Long-term follow-up can be performed using consistent definitions and criteria across different projects for better core data collection. It is hoped that this consensus will be facilitate the development cohort studies of TMJ diseases.
9.Analysis of detection of acute respiratory infection in children under 12 years old in Pudong New Area, Shanghai from 2019 to 2023
Yang YUAN ; Lu ZHANG ; Zhuyun LI ; Yue ZHANG ; Yujia HUO ; Jialiang CHEN ; Qing LIU ; Wenwei ZOU ; Bing ZHAO ; Lipeng HAO ; Lifeng PAN
Shanghai Journal of Preventive Medicine 2024;36(4):342-347
ObjectiveTo investigate the impact of acute respiratory infections in children under 12 years old in Pudong New Area, Shanghai from 2019 to 2023. MethodsAcute respiratory infection samples of children under 12 years old from three sentinel hospitals in Pudong New Area, Shanghai from 2019 to 2023 were collected, and 42 respiratory infection pathogens, including influenza virus, adenovirus, parainfluenza virus, respiratory syncytial virus, human enterovirus/rhinovirus, human pulmonary virus, human bokavirus, coronavirus (229E, HKU1, NL63 and OC43), and novel coronavirus, were detected with microfluidic chips. The situation of acute respiratory infections among outpatient and inpatient children in this area was analyzed for the before the implementation of non pharmacological intervention measures (2019.12‒2020.1), during the period of non pharmacological intervention measures (2020.2‒2022.12), and after non pharmacological intervention measures (2023.1‒2023.6). ResultsFrom 2019 to 2023, a total of 1 770 samples were collected, and 445 pathogens were detected, with a detection rate of 25.14% (445/1 770). The main pathogens detected during the study period were influenza virus: 8.70% (154/1 770), respiratory syncytial virus: 4.41% (78/1 770), human enterovirus/rhinovirus: 2.66% (47/1 770), human adenovirus: 2.49% (44/1 770), and parainfluenza virus: 2.20% (39/1 770). Before the implementation of non pharmacological intervention measures, outpatients were primarily infected with influenza, parainfluenza virus, and respiratory syncytial virus, with detection rates of 8.09%, 4.49%, and 4.04%, respectively; inpatients were mainly infected with influenza, respiratory syncytial virus, and parainfluenza virus, with detection rates of 4.49%, 3.82%, and 3.15%, respectively. During the period of non pharmacological intervention measures, influenza, rhinovirus and respiratory syncytial virus were the main viruses detected in the samples of outpatient children, with detection rates of 4.04%, 3.60%, and 2.47%, respectively; inpatient samples mainly detected respiratory syncytial virus, rhinovirus, and influenza virus, with detection rates of 3.60%, 2.02%, and 1.80%, respectively. After non pharmacological intervention measures, influenza, rhinovirus and respiratory syncytial virus were the main pathogens detected in the outpatients, with detection rates of 9.89%, 2.92% and 2.02%, respectively; influenza, respiratory syncytial virus, and rhinovirus were the main pathogens detected in inpatient children, with detection rates of 6.29%, 1.57%, and 1.35%, respectively. ConclusionThe prevalence of pathogens related to acute respiratory infections in children is influenced by non pharmacological preventive measures.
10.Assessment of respiratory protection competency of staff in healthcare facilities
Hui-Xue JIA ; Xi YAO ; Mei-Hua HU ; Bing-Li ZHANG ; Xin-Ying SUN ; Zi-Han LI ; Ming-Zhuo DENG ; Lian-He LU ; Jie LI ; Li-Hong SONG ; Jian-Yu LU ; Xue-Mei SONG ; Hang GAO ; Liu-Yi LI
Chinese Journal of Infection Control 2024;23(1):25-31
Objective To understand the respiratory protection competency of staff in hospitals.Methods Staff from six hospitals of different levels and characteristics in Beijing were selected,including doctors,nurses,medical technicians,and servicers,to conduct knowledge assessment on respiratory protection competency.According to exposure risks of respiratory infectious diseases,based on actual cases and daily work scenarios,content of respira-tory protection competency assessment was designed from three aspects:identification of respiratory infectious di-seases,transmission routes and corresponding protection requirements,as well as correct selection and use of masks.The assessment included 6,6,and 8 knowledge points respectively,with 20 knowledge points in total,all of which were choice questions.For multiple-choice questions,full marks,partial marks,and no mark were given respective-ly if all options were correct,partial options were correct and without incorrect options,and partial options were correct but with incorrect options.Difficulty and discrimination analyses on question of each knowledge point was conducted based on classical test theory.Results The respiratory protection competency knowledge assessment for 326 staff members at different risk levels in 6 hospitals showed that concerning the 20 knowledge points,more than 60%participants got full marks for 6 points,while the proportion of full marks for other questions was relatively low.Less than 10%participants got full marks for the following 5 knowledge points:types of airborne diseases,types of droplet-borne diseases,conventional measures for the prevention and control of healthcare-associated infec-tion with respiratory infectious diseases,indications for wearing respirators,and indications for wearing medical protective masks.Among the 20 knowledge questions,5,1,and 14 questions were relatively easy,medium,and difficult,respectively;6,1,4,and 9 questions were with discrimination levels of ≥0.4,0.30-0.39,0.20-0.29,and ≤0.19,respectively.Conclusion There is still much room for hospital staff to improve their respiratory protection competency,especially in the recognition of diseases with different transmission routes and the indications for wearing different types of masks.


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