目的 分析类风湿因子（RF）、T淋巴细胞亚群（CD3⁺、CD4⁺、CD8⁺、CD4⁺/CD8⁺）与类风湿关节炎病情程度的关系。方法 选取2023年1月—2024年4月收治的90例类风湿关节炎患者作为观察组,同期到院的90例健康体检者为对照组,均接受RF、CD3⁺、CD4⁺、CD8⁺、CD4⁺/CD8⁺检测,并按照类风湿关节炎患者病情评价（DAS28）判定观察组患者病情的严重程度,应用Pearson相关性分析RF、CD3⁺、CD4⁺、CD8⁺、CD4⁺/CD8⁺与患者病情严重程度的关系。结果 与对照组比较,观察组RF及CD8⁺水平较高,CD3⁺、CD4⁺及CD4⁺/CD8⁺水平较低（P<0.05）;不同病情的RF及CD8⁺水平比较,重度患者最高,其次为中度、轻度,而CD3⁺、CD4⁺及CD4⁺/CD8⁺水平比较,轻度患者最高,其次为中度、重度,两两比较均有差异统计学意义（P<0.05）;经Pearson相关性分析,RF及CD8⁺水平与病情程度呈正相关,CD3⁺、CD4⁺及CD4⁺/CD8⁺水平与病情程度呈负相关（P<0.05）。结论 RF、T淋巴细胞亚群指标与类风湿关节炎发生、发展有密切关系,可为医师准确评估患者病情严重程度提供可靠参考。

Objective To analyze the relationship between rheumatoid factor（RF）,T lymphocyte subsets（CD3⁺,CD4⁺,CD8⁺,CD4⁺/CD8⁺）and the severity of rheumatoid arthritis．Methods A total of 90 patients with rheumatoid arthritis from January 2023 to April 2024 were selected as the observation group,and 90 healthy checkup individuals who came to the hospital during the same period were selected as the control group．All patients underwent RF,CD3⁺,CD4⁺,CD8⁺,and CD4⁺/CD8⁺ tests,and the severity of their condition was determined based on the evaluation of rheumatoid arthritis patient condition（DAS28）． Pearson Correlation analysis was used to analyze the relationship between RF,CD3⁺,CD4⁺,CD8⁺,CD4⁺/CD8⁺ and the disease severity of the patients．Results Compared with the control group,RF and CD8⁺ levels in the observation group were higher,while the levels of CD3⁺,CD4⁺ and CD4⁺/CD8⁺ were low（P<0.05）．Comparison of RF and CD8⁺ levels for different conditions,the RF and CD8⁺ levels of the severe patients was highest,followed by moderate and mild．However,the CD3⁺,CD4⁺ and CD4⁺/CD8⁺ levels were highest in mild patients,followed by the moderate and sereve patients．Statistical significance was found in both pairwise comparisons（P<0.05）．After the Pearson correlation analysis,RF and CD8⁺ levels were positively correlated with the degree of disease,while CD3⁺,CD4⁺,and CD4⁺/CD8⁺ levels were inversely associated with the degree of disease condition（P<0.05）．Conclusions RF and T lymphocyte subsets are closely related to the occurrence and development of rheumatoid arthritis,and can provide reliable references for physicians to accurately evaluate the severity of patients' conditions．

目的 分析全瓷冠与高嵌体对后牙牙体缺损的修复效果及对牙周炎性反应的影响。方法 用随机抽签法将我科2022年2月—2023年5月接治的50例后牙牙体缺损者分为对照组（签号为奇数,全瓷冠修复）与高嵌体组（签号为偶数,高嵌体修复）,各25例,对比两组修复效果（指标为修复体佩戴时间及总体康复时间）、牙周炎性反应、口腔健康指数及并发症发生率。结果 高嵌体组修复体佩戴时间（14.38±2.51）d、总体康复时间为（59.66±4.47）d,短于对照组的（21.96±2.87）d、（93.84±5.26）d（P<0.001）;高嵌体组牙周正常率（88.00%）高于对照组（64.00%）（P<0.05）;高嵌体组修复后的GI、PLI、SBI分别为（0.81±0.19）分、（0.85±0.16）分、（1.04±0.25）分,低于对照组的（0.97±0.23）分、（1.01±0.22）分、（1.31±0.28）分（P<0.05）;高嵌体组并发症发生率（8.00%）接近于对照组（12.00%）（P>0.05）。结论 修复后牙牙体缺损时选用高嵌体修复法可取得相对更好的修复效果,能够缩短患者佩戴修复体时间,加速其康复进程,对牙周炎性反应的减轻、口腔健康的改善均有积极影响,且并发症风险较小,整体效果更优。

Objective To analyze the effect of all-porcelain crown and onlay on posterior tooth defect repair and periodontitis reaction. Methods Fifty cases of posterior dental defects treated in our department from February 2022 to May 2023 were divided into control group（odd-numbered,all-porcelain crown restoration）and onlay group（even-numbered,onlay restoration）with 25 cases each．The repair effect,periodontitis response,oral health index and complication rate were compared between the two groups. Results The wearing time and overall recovery time of the onlay group were shorter than those of the control group（P<0.001）．The periodontal normal rate in the onlay group was higher than that in the control group （P<0.05）．gingival index,plaque index,sulcus bleeding index of the onlay group after repair were lower than those of the control group（P<0.05）．The complication rate of the high inlays group was close to that of the control group（P>0.05）. Conclusions In the repair of post-dental defects,the use of onlay repair can achieve relatively better repair effects,shorten the time for patients to wear the prosthesis,accelerate the rehabilitation process,have a positive impact on the reduction of periodontitis reaction and the improvement of oral health．The risk of its complications is small,and the overall effect is better．

目的 探讨早产儿语言-社会行为情况及其影响因素,研究语言-社会行为发育与智能发育之间的关系,为早产儿保健提供指导。方法 采用自制的一般情况问卷对125例早产儿开展随访、追踪,直至2岁时,采用盖泽尔发展量表（GDS）进行语言-社会行为及智能发育评估。结果 早产儿语言发育正常43例（34.4%）,社会行为发育正常40例（32%）。早产儿语言发育商平均为（67.99±25.75）,社会行为发育商平均为（67.75±23.98）,处于发育低下水平。性别、脑出血病史、定期随访史、康复干预史、家庭干预史在语言、社会行为方面比较差异均无统计学意义（P>0.05）。不同胎儿期安胎史、胎龄、出生体质量在语言、社会行为方面比较差异有统计学意义（P<0.05）;且胎儿期反复安胎,胎龄小,出生体质量低,语言及社会行为发育较差。与出生时无中-重度窒息史的患儿相比,出生时有中-重度窒息的患儿存在更多的语言发育异常,比较差异有统计学意义（P<0.05）;但在社会行为发育方面比较差异无统计学意义（P>0.05）。语言-社交行为发育落后的同时,早产儿的大运动、精细动作、适应性行为也存在落后,五大能区比较差异并均有统计学意义（P<0.05）。结论 多数早产儿存在语言-社会行为发育落后,其同时可能伴有更多的运动和适应行为发育问题;语言-社交行为发育落后的患儿在胎儿期存在反复安胎且胎龄较小、出生体质量更低或有中-重度窒息史。对早产儿的语言-社会行为要及时给予关注,早期发现并早期干预,改善预后。

Objective To explore the language-social behavior of preterm infants and its influencing factors,to study the relationship between language-social behavior development and intellectual development,and to provide guidance for preterm infants' health care．Methods A self-administered general questionnaire was used to follow up 125 preterm infants until the age of 2 years,and Gesell development scale（GDS）was used to assess their language-social behavior and intellectual development．Results Preterm infants had normal language development in 43 cases（34.4%）and normal social behavioral development in 40 cases（32%）．The mean language development quotient of preterm infants was（67.99±25.75）and the mean social behavioral development quotient was（67.75±23.98）,which was at the low developmental level．There were no significant differences in gender,history of cerebral hemorrhage,regular follow-up,rehabilitation intervention,family intervention and language or social behavior（P>0.05）．Infants with different fetal age history,gestational age,and birth weight varied significantly in language and social behavior（P<0.05）;and with repeated miscarriage,small gestational age,low birth weight,showed poor language and social behavior development．Compared the children with and without moderate to severe asphyxia at birth,there was statistically significant differences in language development（P<0.05）,but in social behavior there was no significant difference（P>0.05）．The backward development of language-social behavior was accompanied by backwardness in gross motor,fine motor,and adaptive behavior in preterm infants,and the differences in the five major domains were all present and statistically significant（P<0.05）．Conclusions A major of preterm infants have poor language-social behavior development,which may be accompanied by more motor and adaptive behavior development problems;children with poor language-social behavior development have repeated miscarriage prevention at younger gestational ages,lower birth weights,or a history of moderate-to-severe asphyxia during the fetal period．It is important to give timely attention to language-social behavior in preterm infants for early detection and early intervention to improve prognosis．

目的 探讨影响宫腔修复的因素,为不全流产妇女选择期待治疗提供理论依据。方法 2021年1月—12月在香港大学深圳医院招募早孕药流不全的患者534例,记录其人口学特征以及从排胎到流产后3周到月经复潮后的相关情况,通过多因素Logistic回归分析影响不全流产者宫腔修复的因素。结果 534例药流不全患者中,月经复潮后宫腔残留240例,残留率为44.9%;多因素Logistic回归分析显示,BMI（OR=0.888,95%CI：0.808~0.975）、子宫位置（OR=1.836,95%CI：1.139~2.958）、人工流产次数（OR=2.258,95%CI：1.078~4.728）、阴道流血时长（OR=0.344,95%CI：0.141~0.837）、残留物最大径线（OR=1.061,95%CI：1.031~1.092）、残留物血流信号2级/3级（OR=3.636,95%CI：1.790~7.394;OR=4.001,95%CI：1.561~10.256）是宫腔残留的影响因素。结论 宫腔残留的高危因素有子宫后位、残留物最大径线、1次以上的人工流产、2级及以上的残留物血流信号,且血流信号等级影响最大。BMI和阴道流血时长>3周是宫腔残留的保护因素。

Objective To investigate the factors affecting uterine cavity repair and to provide a theoretical basis for the choice of expectant treatment for women with incomplete abortion．Methods From January to December 2021,534 patients with incomplete abortions were recruited at University of Hong Kong-Shenzhen Hospital,and their demographic characteristics and correlations from expulsion of the gestational sac to 3 weeks after medication abortion and after menstrual resumption were recorded,and the factors affecting uterine cavity repair in incomplete abortions were analyzed by multifactorial logistic regression．Results In 534 women,there were 240 cases of uterine cavity remnants after menstrual return,with a remnant rate of 44.9%;the results of multifactorial logistic regression analysis showed that BMI（OR=0.888,95% CI：0.808-0.975）,uterine position（OR=1.836,95% CI：1.139-2.958）,number of abortions（OR=2.258,95% CI：1.078-4.728）,length of vaginal bleeding（OR=0.344,95% CI：0.141-0.837）,maximum diameter of residuals（OR=1.061,95% CI：1.031-1.092）,and residual blood flow signal grade 2/3（OR=3.636,95% CI：1.790-7.394;OR=4.001,95%CI：1.561-10.256）were influential factors for uterine residuals．Conclusions High-risk factors for uterine residuals are posterior uterus,the maximum diameter of residuals,more than one abortion,grade 2 or higher residual blood flow signal,and the grade of blood flow signal had the greatest effect．BMI and duration of vaginal bleeding >3 weeks are protective factors for uterine residuals．

目的 分析团体认知行为干预联合揿针全程护理对胃癌晚期癌痛患者心理状态的影响。方法 选取我院115例胃癌晚期癌痛患者(2018年3月—2021年1月),依照干预方案不同分为3组。对照1组(37例)接受团体认知行为干预,对照2组(38例)接受揿针全程护理干预,观察组(40例)接受团体认知行为干预联合揿针全程护理干预,比较3组干预效果。结果 疼痛爆发时疼痛缓解情况:观察组疼痛爆发时疼痛缓解率均较对照1组、对照2组高(P＜0.05);心理状态:干预1个月后,3组心理状态均得到改善,且观察组汉密尔顿抑郁量表(HAMD)、汉密尔顿焦虑量表(HAMA)评分均较对照1组、对照2组低(P＜0.05);护理满意度:与对照1组、对照2组对比,观察组护理满意度较高(P＜0.05)。结论 团体认知行为干预联合揿针全程护理应用于胃癌晚期癌痛患者,能有效缓解疼痛,改善心理状态,且护理满意度高。

Objective To analyze the effect of group cognitive behavior intervention combined with whole-process nursing of pressing needle on the psychological state of patients with advanced gastric cancer pain. Methods A total of 115 patients with advanced gastric cancer pain in our hospital (from March 2018 to January 2021) were selected and divided into 3 groups according to different intervention methods. Control group 1 (37 cases) received group cognitive behavioral intervention, control group 2 (38 cases) received whole-course nursing intervention of pressing needle, and observation group (40 cases) received whole-process nursing intervention of group cognitive behavioral intervention combined with pressing needle. The intervention effects of the three groups were compared. Results Pain relief when pain burst: the pain relief rate of observation group was higher than control group 1 and control group 2 (P<0.05). Mental state: after 1 month of intervention, the mental state of the 3 groups was improved, and the scores of Hamilton Depression Scale (HAMD) and Hamilton Anxiety Scale (HAMA) in the observation group were lower than those in control group 1 and control group 2 (P<0.05). Nursing satisfaction: compared with control group 1 and control group 2, nursing satisfaction of observation group was higher (P<0.05). Conclusions Group cognitive behavior intervention combined with whole-process nursing of pressing needle applied to patients with advanced gastric cancer pain could effectively relieve pain, improve psychological state, and nursing satisfaction.

目的 分析上消化道早癌与癌前病变内镜下治疗的效果。方法 将2017年10月—2020年10月接诊且行传统外科手术治疗的75例上消化道早癌与癌前病变患者作为对照组,将同期接诊且行内镜黏膜下剥离术(ESD)治疗的75例上消化道早癌与癌前病变患者作为观察组,对组间围手术期指标、生活质量、疼痛评分、病灶切除情况、治疗效果、并发症发生率展开分析。结果 (1)观察组术中出血量(17.66±2.25)mL、手术用时(96.79±9.25)min、住院时间(10.95±1.88)d、治疗费用(1.74±0.41)万元均少于对照组(87.73±5.63)mL、(190.52±10.68)min、(22.75±2.69)d、(4.96±0.37)万元(P<0.05);(2)组间生活质量、疼痛评分在术前无差异(P>0.05);观察组生活质量、疼痛评分在术后优于对照组(P<0.05);(3)观察组治愈性切除率(98.67%)、整块完整切除率(100.00%)与对照组(96.00%、98.67%)无差异(P>0.05);(4)观察组总有效率(96.00%)与对照组(97.33%)无明显差异(P>0.05);(5)观察组发生2例并发症(2.67%),对照组发生11例并发症(14.67%,P<0.05)。结论 对上消化道早癌与癌前病变患者行ESD治疗,疗效显著,可以减少并发症,减轻疼痛感与经济压力,改善生活质量,值得推广。

Objective To analyze the effect of endoscopic treatment of early upper gastrointestinal cancer and precancerous lesions. Methods From October 2017 to October 2020, 75 patients with early cancer and precancerous lesions of upper digestive tract who were treated by traditional surgery were selected as the control group, and 75 patients with early cancer and precancerous lesions of upper digestive tract who were treated by endoscopic submucosal dissection (ESD) were selected as the observation group. The therapeutic effect and the incidence of complications were analyzed. Results (1) The intraoperative blood loss was (17.66±2.25) mL, operation time was (96.79±9.25) min, hospitalization time was (10.95±1.88) d, treatment cost was(17.4±4.1)thousand yuan in the observation group, which were less than those in the control group [(87.73±5.63) mL, (190.52±10.68) min, (22.75±2.69) d, (49.6±3.7) thousand yuan, (P＜0.05)]. (2) There were no significant differences in quality of life and pain score between groups before operation. The quality of life and pain score of the observation group were better than those of the control group after operation (P<0.05). (3) The curative resection rate (98.67%) and complete resection rate (100.00%) of the observation group were not significantly different from those of the control group (96.00% and 98.67%,P＞0.05); (4) The total effective rate (96.00%) of the observation group was not significantly different from that of the control group (97.33%,P＞0.05); (5) The total effective rate of the observation group was significantly higher than that of the control group (97.33%). There were 2 cases of complications in the observation group (2.67%), and 11 cases in the control group (14.67%, P<0.05). Conclusion ESD treatment for patients with early upper gastrointestinal cancer and precancerous lesions has significant effect, can reduce complications, relieve pain and economic stress, and improve the quality of life, which is worthy of promotion.

目的 探讨四君寿胎汤对地中海贫血孕妇贫血状况的改善效果,以期指导地中海贫血孕妇的中药治疗。方法 选择2019年5月—2020年10月期间我院诊治的200例地中海贫血孕妇,根据随机数字表法将其分为两组,观察组与对照组,各100例,观察组患者给予四君寿胎汤,1剂/d,连续治疗3个月,对照组患者给与安慰剂,1剂/d,连续治疗3个月;治疗前、治疗3个月后,比较两组血液检测指标[血红蛋白(HGB)、红细胞(RBC)、红细胞比容(HCT)、平均红细胞体积(MCV)、平均血红蛋白含量(MCH)]、中医症候积分、肝肾指标[谷丙转氨酶(ALT)、谷草转氨酶(AST)、肌酐(Cre)、尿素(ure)、总胆汁酸(TBA)],记录两组孕妇妊娠结局、新生儿情况并比较。结果 治疗前,两组HGB、RBC、HCT、MCV、MCH比较,差异无统计学意义(P＞0.05);治疗3个月后,两组均升高,且观察组高于对照组(P＜0.05);治疗前,两组食少纳呆、体倦乏力、食后或午后腹胀、大便异常症候积分比较,差异无统计学意义(P＞0.05);治疗结束后,两组症候积分均较治疗前降低,且观察组低于对照组,差异有统计学意义(P＜0.05);治疗前后,两组ALT、AST、TBA、Cre、Ure差异无统计学意义(P＞0.05)。两组胎儿宫内窘迫、宫内生长受限发生率、产妇产后出血率比较,观察组较对照组发生率低,但差异无统计学意义(P＞0.05)。观察组早产发生率较对照组明显下降,差异有统计学意义(P＜0.05);观察组孕妇分娩孕周大于对照组,剖宫产率低于对照组,差异有统计学意义(P＜0.05);两组新生儿窒息率、转PICU率比较,差异无统计学意义(P＞0.05);观察组新生儿出生体重、HGB高于对照组(P＜0.05)。结论 四君寿胎可以改善地中海贫血孕妇的整体贫血状况,对肝肾功能无不良影响,中医证候得到改善,且有利于减少早产发生风险,降低剖宫产率,改善新生儿情况。

Objective To investigate effect of Sijun Shoutai decoction in improving anemia status of pregnant women with thalassemia, and to guide the Chinese medicine treatment of thalassemia in pregnant women in the future. Methods Two hundred pregnant women with thalassemia who were diagnosed in the hospital from May 2019 to October 2020 were divided into observation group and control group randomly, with 100 cases in each group. The observation group was treated with Sijun Shoutai decoction,1 dose/d, with continuous treatment for 3 months. The control group was given placebo,1 dose/d, with continuous treatment for 3 months. The indicators of blood test [hemoglobin (HGB), red blood cell (RBC), hematocrit value (HCT), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH)], TCM symptom scores, hepatic and renal indicators [alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine (Cre), urea (Ure), total bile acid (TBA)] were compared between the two groups before and after treatment for 3 months. The maternal pregnancy outcome and neonatal condition in the two groups were recorded and compared. Results There were no statistical difference in the HGB, RBC, HCT, MCV and MCH between the two groups before treatment (P>0.05); after 3 months the indicators above of two groups increased, and those in observation group were higher than those in control group (P<0.05). There were no statistical differences in the symptom scores of poor appetite, fatigue, abdominal distension after eating or after noon and fecal abnormalities between the two groups before treatment (P<0.05). The levels of ALT, AST and TBA in the two groups decreased after treatment for 3 months, while the Cre and Ure increased, but the differences were not statistically significant (P>0.05). There were no statistical differences in the rates of intrauterine fetal distress, intrauterine growth restriction, and postpartum hemorrhage between the two groups (P>0.05), though the results of observation group were lower than control group.The rate of premature birth was lower than that of control group(P<0.05) ; the gestational week of observation group was more than control group, and the cesarean section rate of observation group was lower than that of control group (P<0.05). There were no statistical differences in the rates of neonatal asphyxia and transfering to PICU between the two groups (P>0.05); the neonatal birth weight and HGB in observation group were higher than those in control group (P<0.05). Conclusion Sijun Shoutai decoction in the treatment of pregnant women with thalassemia can improve anemia status, with no adverse effect on liver or kidney function, improve TCM syndrome, reduce the risk of premature birth,reduce the rate of cesarean,and improve the neonatal condition.

目的 观察恩替卡韦治疗e抗原阳性慢性乙型病毒性肝炎慢加急性肝衰竭(CHB-ACLF)的近期疗效及安全性。方法 选择e抗原阳性CHB-ACLF患者60例,均为我院2016年6月—2017年6月收诊,随机分为各30例的治疗组(采用恩替卡韦治疗)与对照组(采用拉米夫定片治疗),连续用药6个月后,对比疗效及安全性差异。结果 治疗6个月后,治疗组的ALB、PTA水平高于对照组,TBIL、ALT水平低于对照组,MELD评分与HBV-DNA定量少于对照组(P＜0.05);治疗后6个月,两组的HBV-DNA转阴率均高于治疗后1、3个月,且治疗组高于对照组(P＜0.05);治疗期间,治疗组患者死亡4例(13.33%),对照组患者死亡6例(20.00%),两组的死亡率比较无统计学意义(P＞0.05)。结论 恩替卡韦分散片是一种安全、有效的抗e抗原阳性CHB-ACLF药物,能有效抑制病毒复制和改善肝功能,促进患者预后转归。

目的 探讨分娩前后母体血浆D-二聚体的变化及其在预测和预防静脉血栓栓塞症的临床意义。方法 回顾性分析2015年5月在东莞市长安医院分娩的、产前与产后均进行了D-二聚体检测,产前与产后均未使用抗凝药物并产后随访6周的102例产妇的临床资料。结果 分娩后48~72小时,75.5%的产妇血浆D-二聚体水平下降,24.5%的产妇血浆D-二聚体水平升高。血浆D-二聚体水平升高的产妇60%存在发生VTE的高危因素,经积极预防,无静脉血栓栓塞症病例发生。结论 比较分娩前后母体血浆D-二聚体水平是有临床意义的。对分娩后母体血浆D-二聚体水平升高者,尤其是存在血栓高危因素者应高度重视,积极预防静脉血栓栓塞症。

目的 研究探讨重症监护病房(ICU)病原菌的分布及耐药情况,为临床合理使用抗菌药物提供科学依据。方法 回顾性分析2015年ICU住院患者送检细菌分离培养及药敏试验结果。结果 ICU共送检标本1 326份,分离出病原菌554株,其中革兰阴性病原菌462株(83.4%),革兰阳性病原菌48株(8.7%),真菌44株(7.9%)。革兰阴性杆菌前5位依次为鲍曼不动杆菌、铜绿假单胞菌、肺炎克雷伯菌、粘质沙雷菌和大肠埃希菌,且多耐药菌株比例较高。革兰阳性病原菌以金黄色葡萄球菌为主,32株(66.7%),MRSA检出率78.3%(25/32)。结论 加强重症监护病房的细菌及药敏监测,根据病原菌药敏结果指导临床合理使用抗菌药物,控制耐药菌株的产生,预防及控制院内感染及感染暴发。

Objective To investigate the distribution characteristics and drug resistance of pathogenic bacteria in intensive care unit(ICU) and provide scientific evidence for clinically reasonable use of antibiotics. Methods Specimens from hospitalized intensive care unit patients in 2015 were obtained for routine bacterial isolation and culture. Results A total of 554 bacterial strains were isolated from 1326 specimens, in which Gram-negative bacilli accounted for 462 stains (83.4%),Gram-positive cocci accounted for 48 stains (8.7%),and fungi accounted for 44 stains (7.9%). Gram-negative bacilli of the top five were Acinetobacter baumannii,Pseudomonas aeruginosa,Klebsiella pneumoniae, Serratia marcescens and Escherichia coli,and the rate of multiple resistant bacteria was relatively high.Staphylococcus aureus were the main Gram-positive cocci, including MRSA accounted for 78.3%(25/32). Conclusion The monitoring of ICU clinical pathogens and their resistance should be strengthened. It is a great significance to use antibiotics rationally according to the results of susceptibility testing, in order to control the occurrence of resistant bacteria , prevent and control hospital infection and infection outbreak.