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Objective:To analyze the genomic characteristics of H9N2 subtype avian influenza virus in external environmental specimens collected in Huainan city from February to April, 2016.Methods:Specimens positive for H9N2 nucleic acid (Ct value≤30) were screened by fluorescent PCR and cultivated in chicken embryos to extract RNA. Eight gene segments were amplified and analyzed with whole genome sequencing. The molecular characteristics of each gene segment of Huainan strains were analyzed. A phylogenetic tree was constructed based on the sequences.Results:The hemagglutinin (HA) and neuramidinase (NA) genes of two Huainan H9N2 avian influenza strains and the human-derived strain A/Anhui-Lujiang/39/2018/H9N2 shared the homology of 98.2%-98.3% and 97.2%-94.9% in nucleotide and 98.9%-98.8% and 99.2%-98.6% in amino acid. The other six endogenous genes were highly homologous to those of the A/Anhui/1/2013/H7N9 and A/Anhui/33163/2016/H5N6 strains. The phylogenetic tree showed that two H9N2 subtype avian influenza strains isolated in Huainan city in 2016 belonged to G57 genotype, and the endogenous genes of two Huainan H7N9 isolates and human-derived A/Anhui/1/2013/ H7N9 and A/Anhui/33163/2016/H5N6 strains were G57-like genotype. Amino acid mutations in the HA protein receptor binding domain including S132D, K138T, T189D, V/A190T and Q226L were detected. The " TEI" sequence was deleted from the NA stem region. Amino acid mutations associated with drug resistance including H274Y, R292K and N294S were not detected in the isolates, but they carried the mutations of I550L in PA gene, I368V in PB1 gene, I504V in PB2 gene, P42S in NS1 gene, N30D and T215A in M1 gene and S31N in M2 gene.Conclusions:The two H9N2 viruses isolated in the live poultry market in Huainan city were highly homologous to the A/Anhui-Lujiang/39/2018/H9N2 strain isolated from humans. The three strains were within the same evolutionary branch and belonged to G57 genotype. The endogenous genes of the two H9N2 viruses could recombine with H7N9 and H5N6 subtype avian influenza viruses that caused human infection. Amino acid mutations in the HA protein receptor binding domain, deleted sequences in the NA stem region and increased polymerase activity strengthened the ability of viruses to infect humans and were related to the drug resistance to M2 ion channel inhibitors (adamantane). The two Huainan H9N2 viruses remained sensitive to NA inhibitors (oseltamivir phosphate).
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Objective To reveal the epidemic characteristics of influenza in Huainan of Anhui Province and provide scientific basis for prevention and control of influenza surveillance by summarizing the work of influenza virus isolation performed in 2012-2013.Methods First nucleic acid fast typing by real-time PCR method for sentinel hospitals in throat swab specimens for inspection from sentinel hospital ,the influenza virus isolation was performed by using MDCK cells and the identification of the isolates was carried out by hemagglutination ( HA) and hemagglutination inhibition(HI) tests.Results 68 strains of influenza virus were isolated (45.9%) from 148 of positive specimens detected by fluorescent quantitative real-time PCR.The number of subtype A(H1N1),A(H3N2),BY and BV were 26 strains,25 strains,4 strains and 13 strains,respectively,the success rate of the separation were 56.5%,33.3%, 63.0%,respectively.There were significant difference among the separation of the strain rate of success (P<0.05). 2012 epidemic strain in Huainan was influenza BV virus ,and reached epidemic peak in March;2013 epidemic strain was A(H1N1)influenza virus,the epidemic peak was December.Conclusion During the period of influenza surveillance in Huainan,the main subtype of influenza of the year 2012 is BV which reached epidemic peak in March , while subtype A(H1N1) is the main subtype of the year 2013,with the epidemic peak month December .
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Objective To analyze influence mycobacterium tuberculosis sputum culture and heat-proof rifabutin antimicrobial susceptibility test results and related factors.Methods To the centers for disease control and prevention of Huainan tuberculosis clinic into the program to treat 227 sputum smear-positive patients in the sputum culture and heat-proof rifabutin of antimicrobial susceptibility test. Results Among 227 patients sputum culture positive 220 cases, accounting for 96. 9％, sputum culture-negative 2 cases, accounting for 0. 9％, pollution, 5 cases of 2. 2％. Resistance rifabutin antimicrobial susceptibility test,a new patient resistance ratio for 10. 4％ ,early cure loser for 37.5％, concomitant person for 28.9％. Conclusion The mycobacterium tuberculosis in the process of cultivation should be strictly according to the requirements of collecting, processing, specimen vaccination, preservation and observation. Early cure failure patients and treat patients resistant rifabutin rate was far higher than new patients, the patients with irregular or unreasonable chemotherapy were concerned.
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ObjectiveTo identify the first cases of cholera in Huainan,0139 epidemic causes and biological properties. MethodsConventional methods of serological and bacteriological methods of the strains were identified by polymerase chain reaction (PCR) to detect cholera virulence genes, susceptibility testing modified KB.Results1 ,was isolated and serum agglutination results,2 patients were all positive stool samples,6 were in close contact with all the negative rectal swab;turtle pond-like 18,5 were positive;turtle egg in battle were like 9,2 were positive ; turtle eggs 7, the positive three copies; turtle waste 11, were negative. 2, or more positive culture drug sensitivity test of the pioneer B, doxycycline resistant; to ampicillin, tetracycline in sensitive;on norfloxacin, gentamicin, ciprofloxacin sensitive. 3,or more positive cultures gene DNA PCR test results,cholera toxin(CT) ,toxin coregulated pilus (TCP) all were positive. ConclusionFrom the outbreak of cholera 0139 is water pollution caused by turtle ponds,The trip types of 0139 Vibrio cholera were highly homologous with that isolated from green turtle;the bacteria of the pioneer B, doxycycline resistance and carrying cta, tcpa virulence genes.