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Objective To investigate the epidemiological and pathogenic characteristics of viral diarrhea in Minhang District, Shanghai. Methods Random sampling on diarrhea was conducted in intestinal outpatient departments of 2 sentinel hospitals according to a certain sampling interval in Minhang District，Shanghai from 2014 to 2020. Real time PCR technology was used to detect Rotavirus, Norovirus, adenovirus, Astrovirus and Sapovirus in fecal samples. Results A total of 646 out of 1 839 stool specimenswere tested positive, and the positive rate was 35.13%.Five pathogenic viruses were detected , mostly norovirus (421 cases, 65.17%) followed by rotavirus (151 cases, 23.37%).The positive rate of norovirus was higher in the age group of 20- 69 years, and the positive rate of Rotavirus was higher in the age group of 0- 9 years. Conclusions Norovirus and rotavirus accounted for the majority of reported infection diarrhea cases in MinhangDistrict of Shanghai from 2014 to 2020, with significant seasonal peaks. Tailored prevention and control measures should be carried out, particularly in risk seasons.
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Objective:To investigate the epidemiological characteristics of influenza-like illnesses (ILI) and the etiological characteristics of influenza viruses in Minhang District of Shanghai from 2010 to 2021.Methods:The surveillance data collected by influenza surveillance sentinel hospitals and the influenza laboratory network from the first week of 2010 to the 52 nd week of 2021 were used for a statistical analysis. Results:A total of 122 903 cases with ILI were reported by the national influenza surveillance sentinel hospitals in Minhang during 2010 to 2021, and the average percentage of ILI cases was 0.94%, showing an increasing trend ( P<0.001). Among them, those aged 0-4, 5-14, 15-24, 25-59 and ≥60 years accounted for 4.35%, 13.30%, 14.30%, 54.32% and 13.73%, respectively. The percentage of ILI showed obvious periodicity. The seasonal incidence of ILI peaked from December to February and from July to September. But the winter peak at the beginning of 2013 was postponed. There was no significant peak in 2021. A total of 11 625 samples were tested from 2010 to 2021, in which the detection rate of influenza viruses was 20.92% (2 432/11 625). The positive rate was 12.83% (1 492/11 625) for influenza A viruses and 8.09% (940/11 625) for influenza B viruses, indicating that the epidemic intensity caused by influenza A viruses was greater than that caused by influenza B viruses. The overall positive rates for influenza A/H3N2 virus, influenza A/H1N1 virus, influenza B/Victoria lineage and influenza B/Yamagata lineage were 9.04% (1 051/11 625), 3.79% (441/11 625), 2.69% (313/11 625) and 2.19% (255/11 625) during 2010 to 2021. The predominant circulating strains altered between influenza A and influenza B viruses in Minhang District of Shanghai during 2010 to 2019. It generally took six months for an epidemic strain to be replaced by a new one. No obvious regularity was observed in 2020 or 2021. The tendency of the incidence of ILI reported from 2010 to 2019 was basically the same as that of the positive rate of influenza viruses, while there were significant differences in 2020 and 2021. Conclusions:Influenza viruses circulated seasonally in Minhang District of Shanghai with alternating prevalent viral subtypes and the infections mostly occurred in the winter and summer seasons. During the epidemic of COVID-19, the intensity of influenza was decreased, but with the normalization of prevention and control measures, the influenza epidemic showed an obvious upward trend. Therefore, it was important to strengthen the prevention and monitoring of influenza and analyze the virus variations in time.
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Objective@#To investigate the antimicrobial resistance, macrolide-resistance genes, virulence genes and emm types in Streptococcus pyogenes isolates.@*Methods@#A total of 247 oropharyngeal swab specimens were collected from pediatric outpatients (aged 2-11 years) who were clinically diagnosed as scarlet fever in Children′s Hospital of Fudan University from January to December, 2018. These specimens were timely sent to the Microbiology Laboratory for isolation and identification of Streptococcus pyogenes strains were isolate after culturing and identified with bacitracin susceptibility test. Moreover, the diameter of bacitracin inhibition zone was measured by vernier caliper. Their susceptibility to seven antibiotics, including erythromycin, clarithromycin, clindamycin, ampicillin, ceftriaxone, norfloxacin and chloramphenicol, were measured using KB method. Macrolide-resistance genes (mefA, ermA, ermB and Tn916 transposon) and virulence genes (speA, speB, speC, speG, speH, speI, speJ and speK) were detected by PCR. Amplification and sequencing of emm gene were conducted according to the protocol in the website of Centre for Disease Control and Prevention (CDC).@*Results@#A total of 86 strains of Streptococcus pyogenes were isolated from the 247 specimens. Their resistance rates to erythromycin, clarithromycin and clindamycin were 89.5%, 95.3% and 96.5%, respectively. However, these isolates showed high susceptibility to ampicillin (100.0%), ceftriaxone (100.0%), norfloxacin (90.7%) and chloramphenicol (95.3%). The positive rates of mefA, ermA, ermB and Tn916 genes were 20.9%, 24.4%, 98.8% and 97.7%. There was significant difference in the mefA-carrying rates between patients with scarlet fever and angina. The positive rates of virulence genes of speA, speB, speC, speG, speH, speI, speJ, speK, speL and speM were 8.1%, 100.0%, 95.3%, 100.0%, 80.2%, 90.7%, 10.5%, 100.0%, 5.8% and 5.8%. Seven emm types were identified and the predominant types were emm12.0 (75.6%), emm12.19 (9.3%) and emm1.0 (8.1%). The diameter of bacitracin inhibition zone was smaller in isolates of emm1.0 type than in emm12.0 type strains. The profile of virulence genes varied in the strains of different emm types. All types of strains carried speB, speG and speK genes. The isolates of emm1.0 type carried speA virulence gene, while speB, speC, speG, speH, speI and speK genes were more often identified in emm12.0 type isolates.@*Conclusions@#This study showed that emm types were associated with the profile of virulence genes and the diameter of bacitracin inhibition zone. It was recommended that the diameter of bacitracin inhibition zone should be measured in bacitracin inhibition susceptibility test apart from only observing the formation of inhibition zone.
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At present, China's AIDS testing increased rapidly, but there are still many people living with HIV do not recognize their status, thus postponing the antiviral treatment time. HIV self-testing (HST) is an effective method to expand the testing, not only simple operation, easy to get a result, effectively protect the detection privacy, expand the selection of testers, suit to the entire population, but also the premise and basis of other AIDS comprehensive prevention measures, all over the world are promoting it. Because the HST has controversies in the window period, price and before and after controversial, and our country is in the initial stage of HST, so it is not to develop related policies, but more and more countries are in accordance with their own situations are modified or developed to allow to use rapid detection of AIDS policy to regulate the field. This paper analyzed and summarized the advantage and influence factors of HST promotion, HST believes that in the long term, the advantages outweigh the disadvantages, we need to formulate relevant policies, and improve the sensitivity of the kit, shorten the window period of time, production and promotion of operation standard of video, specification and testing the operating practices, preventing and reporting the possible social harm, investigation and understanding of the needs of the people of the crowd, to maximize the advantages of HST, find more infection, so as to curb the epidemic of AIDS.
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<p><b>OBJECTIVE</b>To observe the trends on prevalence of early syphilis and HIV infection among men who had sex with men in the last six years from a HIV/AIDS counseling and testing clinic in Nanjing, and to develop relative strategies.</p><p><b>METHODS</b>Men who have sex with men involved in AIDS/HIV and syphilis voluntary counseling and testing services were recruited and investigated from 2008 to 2013 in this clinic. Clients whose syphilis serologic test showed positive were determined the diagnosis by physician within the referral network from sexually transmitted diseases clinics. Demographic information on early syphilis, HIV infection or co-infection with HIV and early syphilis was described while related epidemic trend analysis was performed.</p><p><b>RESULTS</b>The annual numbers of men having sex with men under survey were 1 004 in 2008, 1 218 in 2009, 1 236 in 2010, 748 in 2011, 1 019 in 2012 and 1 420 in 2013. The prevalence rates of early syphilis appeared to be: 2.19% in 2008, 2.71% in 2009, 2.43% in 2010, 1.74% in 2011, 3.04% in 2012 and 2.32% in 2013, with the trend as: P > 0.05. The prevalence rates of HIV infection were 1.29% in 2008, 2.63% in 2009, 5.42% in 2010, 8.82% in 2011, 11.97% in 2012 and 10.42% in 2013, with trend as: P < 0.01. The prevalence rates of early syphilis with HIV infection increased from 0.20% in 2008 to 1.06% in 2013 (trend: P < 0.01). The proportion of HIV co-infection among men having sex with men with early syphilis infection, increased from 9.09% in 2008 to 45.45% in 2013, with trend: P < 0.01.</p><p><b>CONCLUSION</b>Early syphilis infection among men who having sex with men showed a stable trend but the number of HIV and co-infections with early syphilis and HIV increased rapidly in the last six years in Nanjing. Continued intervention strategies should target on men who have sex with men to slow down the epidemic of syphilis and HIV infection.</p>