1.Meta-analysis and trial sequential analysis of Chaihuang Granules in treatment of upper respiratory tract infection in children.
Ni ZHONG ; Wen-Hao GONG ; Tong WAN ; Rong FENG ; Zhi-Fei LI ; Ze-Qi CAI ; Jun-Yuan GAN ; Jun AI
China Journal of Chinese Materia Medica 2023;48(19):5377-5388
This study aimed to evaluate the efficacy and safety of Chaihuang Granules in the treatment of upper respiratory tract infection in children. The databases such as CNKI, Wanfang, VIP, SinoMed, Cochrane Library, PubMed, EMbase, Web of Science, Chinese Clinical Trial Registry, and ClinicalTrials.gov were searched for randomized controlled trial(RCT) of Chaihuang Granules for the treatment of upper respiratory tract infection in children, and supplemented by manual searching of gray literature. Two investigators independently screened the literature, extracted data, and assessed the methodological quality. Meta-analysis was performed using RevMan 5.4 software, trial sequential analysis was conducted using TSA 0.9.5.10 Beta software, and evidence quality evaluation was carried out using GRADE profiler 3.6.1 software. Eighteen RCTs involving 2 459 patients(1 262 in the treatment group and 1 197 in the control group) were included. Meta-analysis showed that compared with conventional therapy alone, Chaihuang Granules significantly improved the total effective rate(RR=1.18, 95%CI[1.15, 1.22], P<0.000 01), reduced the disappearance time of symptoms/signs(MD=-1.39, 95%CI[-1.66,-1.12], P<0.000 01), improved cytokine levels(MD=-2.40, 95%CI[-3.80,-1.00], P=0.000 8), improved humoral immune levels(MD=0.75, 95%CI[0.60, 0.90], P<0.000 01), and reduced the recurrence rate(MD=-2.11, 95%CI[-2.98,-1.25], P<0.000 01). However, the incidence of adverse reactions was not increased(RR=0.94, 95%CI[0.59, 1.49], P=0.78). Subgroup analysis showed that:(1) both Chaihuang Granules used alone(RR=1.19, 95%CI[1.11, 1.27], P<0.000 01) and in combination with other therapies(RR=1.18, 95%CI[1.14, 1.22], P<0.000 01) effectively improved the total effective rate.(2) In terms of symptoms/signs disappearance time, Chaihuang Granules effectively reduced the duration of fever(MD=-1.18, 95%CI[-1.78,-0.58], P=0.000 1), cough with sputum(MD=-1.82, 95%CI[-2.38,-1.25], P<0.000 01), cough(MD=-1.31, 95%CI[-1.89,-0.74], P<0.000 01), sore throat(MD=-1.57, 95%CI[-2.25,-0.89], P<0.000 01), and lung rales(MD=-1.49, 95%CI[-2.06,-0.92], P<0.000 01).(3) Regarding cytokine levels, Chaihuang Gra-nules effectively improved the levels of interleukin(IL)-2(MD=-0.94, 95%CI[-1.16,-0.72], P<0.000 01), IL-6(MD=-4.71, 95%CI[-6.39,-3.03], P<0.000 01), and tumor necrosis factor-α(TNF-α)(MD=-2.07, 95%CI[-2.43,-1.71], P<0.000 01).(4) In terms of cellular immune levels, Chaihuang Granules effectively improved the levels of CD3~+(MD=4.11, 95%CI[1.53, 6.69], P=0.002), CD4~+(MD=4.21, 95%CI[1.69, 6.73], P=0.001), CD8~+(MD=-2.65, 95%CI[-3.93,-1.37], P<0.000 1), and CD4~+/CD8~+(MD=0.25, 95%CI[0.14, 0.37], P<0.000 1).(5) In terms of humoral immune levels, Chaihuang Granules effectively improved the levels of IgA(MD=0.44, 95%CI[0.23, 0.64], P<0.000 1), IgM(MD=0.31, 95%CI[0.15, 0.46], P=0.000 1), and IgG(MD=2.02, 95%CI[1.60, 2.43], P<0.000 01). Trial sequential analysis showed that the cumulative Z-curve of the total effective rate crossed the boundary value, further confirming its clinical efficacy. The GRADE evidence quality evaluation showed that the evidence quality of the above outcome indicators was low or very low, and the recommendation strength was weak. Compared to conventional therapy alone, Chaihuang Granules can effectively improve the total effective rate of treatment, alle-viate symptoms and signs of upper respiratory tract infection in children, improve inflammatory conditions, enhance immune function, and reduce the recurrence rate. Due to the limited quality of the included studies, high-quality RCT is still needed to provide evidence support for the above conclusions.
Child
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Humans
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Drugs, Chinese Herbal/therapeutic use*
;
Treatment Outcome
;
Clinical Trials as Topic
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Respiratory Tract Infections/drug therapy*
2.Meta-analysis and trial sequential analysis of Compound Qinlan Oral Liquid in treatment of acute upper respiratory tract infection.
Ni ZHONG ; Wen-Hao GONG ; Tong WAN ; Rong FENG ; Zhi-Fei LI ; Ze-Qi CAI ; Jun-Yuan GAN ; Jun AI
China Journal of Chinese Materia Medica 2023;48(24):6798-6811
This study aims to evaluate the efficacy and safety of Compound Qinlan Oral Liquid in the treatment of acute upper respiratory tract infection. Computer-based online searching of CNKI, VIP, SinoMed, Wanfang, ChiCTR, ClinicalTrials.gov, Cochrane Library, PubMed, EMbase, and Web of Science was performed to retrieve the randomized controlled trial(RCT) regarding Compound Qinlan Oral Liquid in the treatment of acute upper respiratory tract infection. In addition, manual searching of gray literature was conducted. After two evaluators independently selected articles, extracted data, and evaluated the quality of methodology included in the studies, Meta-analysis was carried out in RevMan 5.4 and trial sequential analysis(TSA) in TSA 0.9.5.10 Beta. GRADE profiler 3.6.1 was employed to evaluate the evidence quality. A total of 21 RCTs were included in this study, involving 2 651 patients(1 330 patients in the observation group and 1 321 patients in the control group). Meta-analysis showed that compared with conventional western medicine alone, Compound Qinlan Oral liquid improved the total response rate(RR=1.15, 95%CI[1.12, 1.19], P<0.000 01) without increasing the incidence of adverse reactions(RR=0.77, 95%CI[0.47, 1.25], P=0.16). The results of subgroup analysis are described as follows:(1) Compared with conventional western medicine alone, Compound Qinlan Oral Liquid improved the total response rate(RR=1.10, 95%CI[1.05, 1.14], P<0.000 01) and shortened the time to symptom relief(SMD=-0.76, 95%CI[-1.02,-0.51], P<0.000 01). There was no significant difference in the incidence of adverse reactions between the two groups(RR=1.16, 95%CI[0.54, 2.47], P=0.71).(2) Compared with conventional western medicine alone, Compound Qinlan Oral Liquid + conventional western medicine improved the total response rate(RR=1.20, 95%CI[1.15, 1.25], P<0.000 01), decreased traditional Chinese medicine(TCM) syndrome scores(MD=-0.58, 95%CI[-0.75,-0.41], P<0.000 01), shortened the time to symptom relief(SMD=-2.44, 95%CI[-3.09,-1.80], P<0.000 01) and physical sign improvement(MD=-2.57, 95%CI[-4.11,-1.04], P=0.001), lowered the serum levels of inflammatory cytokines(SMD=-2.16, 95%CI[-2.61,-1.70], P<0.000 01), improved respiratory function indicators(SMD=1.48, 95%CI[1.00, 1.96], P<0.000 01), and enhanced the humoral immunity(MD=0.94, 95%CI[0.69, 1.18], P<0.000 01). There was no significant difference in the incidence of adverse reactions between the two groups(RR=0.57, 95%CI[0.29, 1.09], P=0.09). TSA showed that the cumulative Z curve of total response rate crossed the traditional threshold and TSA threshold, further confirming the clinical efficacy of Compound Qinlan Oral Liquid. The GRADE graded the evidence of the above outcome indicators as low or extremely low, and yielded weak recommendation. Compared with conventional western medicine alone, Compound Qinlan Oral Liquid can improve the total effective rate and reduce the time to symptom relief. The combination of Compound Qinlan Oral Liquid and conventional western medicine can improve the total response rate, mitigate the symptoms and improve the physical signs, reduce inflammation, and improve respiratory function and immunity of the patients with acute upper respiratory tract infection. In view of the limited number and quality of the included studies, the above conclusions still require high-quality RCT to provide evidence support.
Humans
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Drugs, Chinese Herbal/therapeutic use*
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Inflammation/drug therapy*
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Medicine, Chinese Traditional
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Respiratory Tract Infections/drug therapy*
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Treatment Outcome
3.A phase I study of subcutaneous envafolimab (KN035) monotherapy in Chinese patients with advanced solid tumors.
Rong Rui LIU ; Shan Zhi GU ; Tie ZHOU ; Li Zhu LIN ; Wei Chang CHEN ; Dian Sheng ZHONG ; Tian Shu LIU ; Nong YANG ; Lin SHEN ; Si Ying XU ; Ni LU ; Yun ZHANG ; Zhao Long GONG ; Jian Ming XU
Chinese Journal of Oncology 2023;45(10):898-903
Objective: To evaluate the safety and antitumor activity of envafolimab monotherapy in Chinese patients with advanced solid tumors. Methods: This open-label, multicenter phase I trial included dose escalation and dose expansion phases. In the dose escalation phase, patients received subcutaneous 0.1, 0.3, 1.0, 2.5, 5.0 or 10.0 mg/kg envafolimab once weekly (QW) following a modified "3+ 3" design. The dose expansion phase was performed in the 2.5 mg/kg and 5.0 mg/kg (QW) dose cohorts. Results: At November 25, 2019, a total of 287 patients received envafolimab treatment. During the dose escalation phase, no dose-limiting toxicities (DLT) was observed. In all dose cohorts, drug-related treatment-emergent adverse events (TEAEs) for all grades occurred in 75.3% of patients, and grade 3 or 4 occurred in 20.6% of patients. The incidence of immune-related adverse reactions (irAE) was 24.0% for all grades, the most common irAEs (≥2%) included hypothyroidism, hyperthyroidism, immune-associated hepatitis and rash. The incidence of injection site reactions was low (3.8%), all of which were grades 1-2. Among the 216 efficacy evaluable patients, the objective response rate (ORR) and disease control rate (DCR) were 11.6% and 43.1%, respectively. Median duration of response was 49.1 weeks (95% CI: 24.0, 49.3). Pharmacokinetic (PK) exposure to envafolimab is proportional to dose and median time to maximum plasma concentration is 72-120 hours based on the PK results from the dose escalation phase of the study. Conclusion: Subcutaneous envafolimab has a favorable safety and promising preliminary anti-tumor activity in Chinese patients with advanced solid tumors.
Humans
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East Asian People
;
Neoplasms/pathology*
;
Antibodies, Monoclonal, Humanized/therapeutic use*
4.A phase I study of subcutaneous envafolimab (KN035) monotherapy in Chinese patients with advanced solid tumors.
Rong Rui LIU ; Shan Zhi GU ; Tie ZHOU ; Li Zhu LIN ; Wei Chang CHEN ; Dian Sheng ZHONG ; Tian Shu LIU ; Nong YANG ; Lin SHEN ; Si Ying XU ; Ni LU ; Yun ZHANG ; Zhao Long GONG ; Jian Ming XU
Chinese Journal of Oncology 2023;45(10):898-903
Objective: To evaluate the safety and antitumor activity of envafolimab monotherapy in Chinese patients with advanced solid tumors. Methods: This open-label, multicenter phase I trial included dose escalation and dose expansion phases. In the dose escalation phase, patients received subcutaneous 0.1, 0.3, 1.0, 2.5, 5.0 or 10.0 mg/kg envafolimab once weekly (QW) following a modified "3+ 3" design. The dose expansion phase was performed in the 2.5 mg/kg and 5.0 mg/kg (QW) dose cohorts. Results: At November 25, 2019, a total of 287 patients received envafolimab treatment. During the dose escalation phase, no dose-limiting toxicities (DLT) was observed. In all dose cohorts, drug-related treatment-emergent adverse events (TEAEs) for all grades occurred in 75.3% of patients, and grade 3 or 4 occurred in 20.6% of patients. The incidence of immune-related adverse reactions (irAE) was 24.0% for all grades, the most common irAEs (≥2%) included hypothyroidism, hyperthyroidism, immune-associated hepatitis and rash. The incidence of injection site reactions was low (3.8%), all of which were grades 1-2. Among the 216 efficacy evaluable patients, the objective response rate (ORR) and disease control rate (DCR) were 11.6% and 43.1%, respectively. Median duration of response was 49.1 weeks (95% CI: 24.0, 49.3). Pharmacokinetic (PK) exposure to envafolimab is proportional to dose and median time to maximum plasma concentration is 72-120 hours based on the PK results from the dose escalation phase of the study. Conclusion: Subcutaneous envafolimab has a favorable safety and promising preliminary anti-tumor activity in Chinese patients with advanced solid tumors.
Humans
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East Asian People
;
Neoplasms/pathology*
;
Antibodies, Monoclonal, Humanized/therapeutic use*
5.Diagnostic value of rapid antigen testing for the detection of SARS-CoV-2 infection.
Jing Jing LI ; Mei ZENG ; Jin XU ; Yan Ling GE ; He TIAN ; Zhong Lin WANG ; Gong Bao LIU ; Xiao Wen ZHAI ; Xiao Bo ZHANG ; Qi Rong ZHU ; Hai Ling CHANG
Chinese Journal of Pediatrics 2022;60(11):1153-1157
Objective: To investigate the diagnostic value of rapid antigen test based on colloidal gold immunochromatographic assay for the detection of SARS-CoV-2 infection in symptomatic patients. Methods: From May 20 to June 5 2022, 76 hospitalized children and their 55 accompanying family members with confirmed SARS-CoV-2 infection in the COVID-19 isolation unit of the Children's Hospital of Fudan University (designated referral hospital for SARS-CoV-2 infection in Shanghai) enrolled. Their nasopharyngeal swab specimens were consecutively collected. The samples were tested for SARS-CoV-2 nucleic acid by real-time quantitative. SARS-CoV-2 antigen was tested by immunochromatography. The correlation between the antigen detection results and the change of the cycle threshold (Ct) values were evaluated, as well as the sensitivity and specificity of SARS-CoV-2 antigen detection at different periods after the onset of the disease. Kappa consistency test was conducted to investigate the consistency between the 2 diagnostic methods. Results: Of the enrolled SARS-CoV-2 symptomatic infections, 76 were children, including 41 males and 35 females, with an age of 5 (2, 9) years; 55 were accompanying families, including 8 males and 47 females, with an age of 38 (32, 41) years. All 478 samples were simultaneously tested for SARS-CoV-2 antigen and nucleic acid. In any period from disease onset to negative conversion of viral nucleic acid, the overall sensitivity of the rapid antigen test was 48.2% (119/247), the specificity was 98.3% (227/231), and antigen test and nucleic acid test showed moderate consistency (κ=0.46, P<0.05). The sensitivity of antigen test was 100% (82/82) when the Ct value was ≤25. And the sensitivity of antigen test was 8/10, 4/15 and 8.3% (3/36) when the Ct value was 26, 30 and 35, respectively. All antigen tests were negative when Ct value was >35. During the period of 1-2 days, 3-5 days, 6-7 days, 8-10 days and >10 days after onset, the sensitivity and specificity of SARS-CoV-2 antigen test were 5/8 and 5/5, 90.2% (37/41) and 5/5, 88.9% (24/27) and 2/5, 45.0% (36/80) and 94.1% (32/34), 18.7% (17/91) and 98.9% (183/185) respectively. The Ct values of nasopharyngeal swabs were<26 during 2 to 7 days after onset, 28.7±5.0 on day 8, 34.5±2.9 on day 13 and > 35 after 14 days, respectively . Conclusion: SARS-CoV-2 antigen test in the patients with SARS-CoV-2 infection shows acceptable sensitivity and specificity within 7 days after onset of disease, and the sensitivity was positively correlated with viral load and negatively correlated with onset time.
Male
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Child
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Female
;
Humans
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COVID-19
;
SARS-CoV-2
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China
;
COVID-19 Testing
;
Nucleic Acids
6.Construction and application of comprehensive system of chronic diseases surveillance in Zhejiang province.
Ru Ying HU ; Wei Wei GONG ; Jie Ming ZHONG ; Jin PAN ; Hao WANG ; Meng WANG ; Fang Rong FEI ; Min YU
Chinese Journal of Epidemiology 2022;43(9):1485-1490
To construct a non-communicable disease system recommended by WHO, develop the key techniques and promote their applications, obtain the main health indicators and understand the prevalence of chronic diseases, and provide support for the prevention, control and research of chronic diseases. Based on factor analysis, K-means clustering and multi-cluster random sampling, 30 typical sampling areas at provincial level were designed and constructed; By referring to WHO's Non-communicable Disease Surveillance Framework and the American behavioral risk factor sampling and questionnaire and combined with China's actual needs, a comprehensive surveillance system for chronic diseases, covering morbidity and mortality, risk factor exposure and community management and control of chronic diseases, was established, a "5+12+1" quality control system for surveillance data collection, management, analysis and feedback was formed and a three-level surveillance information management platform and information technology construction standards in the province were established, resulting the integration of life registration, chronic disease case reporting and community chronic disease management. Using these key techniques, we have obtained high-quality surveillance data of the whole province, produced the main health indicators, carried out research of chronic diseases, and analyze the prevalence and changing trend of the main chronic diseases and related risk factors to boost the government's practical projects for the reform of the people's livelihood and facilitate the construction of "Healthy Zhejiang". The successful experiences and key techniques have been applied in the construction of chronic disease surveillance system in some provinces in China.
China/epidemiology*
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Chronic Disease
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Chronic Disease Indicators
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Humans
;
Noncommunicable Diseases
;
Prevalence
7.Clinical features of five children with hepatitis-associated aplastic anaemia
Meijuan WANG ; Xuemei ZHONG ; Xin MA ; Huijuan NING ; Dan ZHU ; Youzhe GONG ; Rong LIU
Chinese Pediatric Emergency Medicine 2022;29(12):994-997
Objective:To investigate the clinical characteristics of hepatitis-associated aplastic anaemia(HAAA)in children.Methods:A retrospective analysis was performed on the clinical manifestations, laboratory examinations, treatments and other clinical data of five children with aplastic anemia(AA)diagnosed by bone marrow examination after admission with acute liver dysfunction admitted to the Department of Gastroenterology, Children′s Hospital Affiliated to Capital Institute of Pediatrics from January 2016 to December 2020.Results:All five children were boys and the onset age of these children ranged from 2 to 13 years.All of the five cases were acute onset and presented with jaundice.The time frame of the diagnosis of HAAA was 0 to 12 weeks from the presentation of the liver disease.One patient had simultaneous onset of hepatitis and aplastic anemia.The liver function was significantly improved at the diagnosis of HAAA in three patients and worsen in one patient.Only one patient showed CMV-DNA positive and the pathogen results of other patients were negative.Lymphocyte immunity disorders were found in all five patients, and the proportion of inhibitory/cytotoxic T lymphocytes(CD3 + CD8 + ) increased.Two children received hematopoietic stem cell transplantation, of which one died and one improved after transplantation.One child improved after treated with antithymocyteglobulin and cyclosporin.One child died due to severe infection.There was no significant improvement in one child treated with cyclosporine. Conclusion:HAAA should be alerted in acute hepatitis patients.Blood routine should be monitored even if liver function improves.Bone marrow tests are needed if patients have peripheral cytopenia in two or more lineages.Early and timely treatments with immunosuppressive therapy and hematopoietic stem cell transplantation can improve the prognosis.
8.Ultrasound anatomy and needle-knife insertion approach of common tendon lesions in knee osteoarthritis based on meridian sinew theory.
Jing LIU ; Zhong-Biao XIU ; Qiao-Xuan LIN ; Li-Ming LU ; Ze-Xing GUO ; Yu-Rong GONG
Chinese Acupuncture & Moxibustion 2021;41(8):892-896
OBJECTIVE:
To explore the ultrasonic anatomical characteristics and needle-knife insertion approach of common tendon lesions in knee osteoarthritis (KOA), so as to provide the references for accurate release of KOA by needle- knife along tendon lesions based on meridian sinew theory.
METHODS:
Sixty patients with one-knee KOA were selected. High-frequency musculoskeletal ultrasound was used to collect sonograms at the anatomical positions of "Hedingci" "Binwaixia" "Binneixia" and "Yinlingshang". The anatomic levels were marked on the sonograms. The anatomic levels and sonographic features of lesions were compared and analyzed, and the relevant data of needle-knife simulation approach was measured.
RESULTS:
The "Hedingci" lesions were mainly located at the attachment of quadriceps tendon to patella and suprapatellar bursa. The "Binwaixia" and "Binneixia" lesions were mainly located at the attachment of retinaculum patellae laterale and retinaculum patellae mediale to patella and infrapatellar fat pad. The "Yinlingshang" lesions were mainly located at the attachment of goose foot tendon to medial tibial condyle and bursa of goose foot. With "Hedingci" as an example, when the needle-knife entry point was 1 cm above the patella, the attachment of quadriceps tendon to patella was released, and the average depth of needle-knife was (3.60±0.10) cm, and the needle body was perpendicular to the skin. The average depth of needle-knife for releasing suprapatellar bursa was (2.35±0.17) cm, and the needle body was 45° towards head.
CONCLUSION
The musculoskeletal ultrasound could clearly show the local detailed anatomical level, ultrasonic characteristics and anatomical level of common tendon lesions of KOA, and could improve the accuracy of needle-knife along tendon lesions with non-direct vision, which has important reference value for needle-knife medical standardization and standardized operation.
Humans
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Knee Joint/surgery*
;
Meridians
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Osteoarthritis, Knee/surgery*
;
Patella
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Tendons/surgery*
;
Ultrasonography
9.Automated classification of ICD-O-3 morphology code from pathology reports using text-mining and support vector machine
PAN Jin ; GONG Wei Wei ; FEI Fang Rong ; WANG Meng ; ZHOU Xiao Yan ; HU Ru Ying ; ZHONG Jie Ming
Journal of Preventive Medicine 2021;33(3):255-258
Objective:
To evaluate the accuracy of automated classification of ICD-O-3 morphology code from pathology reports by text-mining and support vector machine ( SVM ) , in order to provide basis for automated tumor coding in Chinese.
Methods:
The tumor report cards of Zhejiang residents from 2017 to 2019 were collected from Chronic Disease Surveillance Information Management System of Zhejiang Province. According to ICD-O-3, the keywords of the pathology reports were extracted, and SVM was used for automatic classification. The classification results were compared with those of 16 professionals with more than two years of experience in tumor coding, and the accuracy rate, recall rate and F-score were calculated for effect evaluation.
Results:
Totally 83 082 cases from 2017 to 2019 were included and were categorized into 17 morphological classifications, with 52 877 ( 63.65% ) cases of adenocarcinoma, squamous carcinoma and transitional cell carcinoma. A total of 1 090 keywords were enrolled into main corpus. The total F-score, accuracy rate and recall rate are 85.69, 77.20% and 96.27%, respectively.
Conclusion
Text-mining combined with SVM can improve the efficiency of ICD-O-3 morphology coding; however, the accuracy needs to be further improved.
10. Risk assessment and early warning of imported COVID-19 in 21 cities, Guangdong province
Jianxiong HU ; Tao LIU ; Jianpeng XIAO ; Guanhao HE ; Zuhua RONG ; Lihua YIN ; Donghua WAN ; Weilin ZENG ; Dexin GONG ; Lingchuan GUO ; Zhihua ZHU ; Lilian ZENG ; Min KANG ; Tie SONG ; Haojie ZHONG ; Jianfeng HE ; Limei SUN ; Yan LI ; Wenjun MA
Chinese Journal of Epidemiology 2020;41(5):658-662
Objective To assess the imported risk of COVID-19 in Guangdong province and its cities, and conduct early warning. Methods Data of reported COVID-19 cases and Baidu Migration Index of 21 cities in Guangdong province and other provinces of China as of February 25, 2020 were collected. The imported risk index of each city in Guangdong province were calculated, and then correlation analysis was performed between reported cases and the imported risk index to identify lag time. Finally, we classified the early warming levels of epidemic by imported risk index. Results A total of 1 347 confirmed cases were reported in Guangdong province, and 90.0% of the cases were clustered in the Pearl River Delta region. The average daily imported risk index of Guangdong was 44.03. Among the imported risk sources of each city, the highest risk of almost all cities came from Hubei province, except for Zhanjiang from Hainan province. In addition, the neighboring provinces of Guangdong province also had a greater impact. The correlation between the imported risk index with a lag of 4 days and the daily reported cases was the strongest (correlation coefficient: 0.73). The early warning base on cumulative 4-day risk of each city showed that Dongguan, Shenzhen, Zhongshan, Guangzhou, Foshan and Huizhou have high imported risks in the next 4 days, with imported risk indexes of 38.85, 21.59, 11.67, 11.25, 6.19 and 5.92, and the highest risk still comes from Hubei province. Conclusions Cities with a large number of migrants in Guangdong province have a higher risk of import. Hubei province and neighboring provinces in Guangdong province are the main source of the imported risk. Each city must strengthen the health management of migrants in high-risk provinces and reduce the imported risk of Guangdong province.


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