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J Clin Virol. Serologic assay for avian-origin influenza A (H7N9) virus in adults of Shanghai, Guangzhou and Yunnan, China.
[Source: US National Library of Medicine, full page: (LINK). Abstract, edited.]
J Clin Virol. 2014 Apr 13. pii: S1386-6532(14)00138-3. doi: 10.1016/j.jcv.2014.04.006. [Epub ahead of print]
Serologic assay for avian-origin influenza A (H7N9) virus in adults of Shanghai, Guangzhou and Yunnan, China.
Wang W<SUP>1</SUP>, Peng H<SUP>1</SUP>, Tao Q<SUP>1</SUP>, Zhao X<SUP>2</SUP>, Tang H<SUP>1</SUP>, Tang Z<SUP>1</SUP>, Wang Y<SUP>1</SUP>, Wang Y<SUP>3</SUP>, Zhao P<SUP>4</SUP>, Qi Z<SUP>5</SUP>.
Author information: <SUP>1</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. <SUP>2</SUP>Microbiology Laboratory, Center for Disease Control and Prevention of Xuhui District, Shanghai, China. <SUP>3</SUP>National Institute for Viral Disease Control and Prevention, China CDC, Beijing, China. Electronic address: euy-tokyo@umin.ac.jp. <SUP>4</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. Electronic address: pnzhao@163.com. <SUP>5</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. Electronic address: qizt@smmu.edu.cn.
Abstract
BACKGROUND AND OBJECTIVE:
To investigate serologic status for novel avian influenza A (H7N9) virus in different areas in China, we examined serum samples collected in winter of 2011 from adult population of Shanghai (eastern China), Guangzhou (southern China) and Yunnan (southwest China) for the antibody responses to this virus.
STUDY DESIGN:
A total of 900 stored serum samples of adult outpatients (300 samples for each area) were subjected to anti-hemagglutinin (HA) antibodies assay using enzyme-linked immunosorbent assay (ELISA) and neutralizing antibodies assay using H7N9 pseudotyped particles (H7N9pp) and authentic H7N9 virus based neutralization test.
RESULTS:
Anti-H7 antibodies were detected in 164, 186 and 123 samples from three areas above, respectively. Among anti-H7 positive sera, 20, 42 and 13 samples had neutralizing titers of ≥10 when 8?10<SUP>2</SUP> focus-forming units (FFU) of H7N9 pseudotyped particles (pp) were adopted in neutralizing assay, respectively. When neutralizing antibodies were assayed using classic microneutralization (MN) test, MN titers of ≥10 were found in 7 samples from Guangzhou, but none from Shanghai and Yunnan.
CONCLUSION:
Low levels of protective immunity pre-existed in some general adult population of the three areas, and pre-existing immunity against H7N9 in Guangzhou appears stronger than that in Shanghai and Yunnan.
Copyright ? 2014 Elsevier B.V. All rights reserved.
KEYWORDS: H7N9, Influenza, Neutralizing antibody, Pre-existing immunity, Serology
PMID: 24793969 [PubMed - as supplied by publisher]
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J Clin Virol. 2014 Apr 13. pii: S1386-6532(14)00138-3. doi: 10.1016/j.jcv.2014.04.006. [Epub ahead of print]
Serologic assay for avian-origin influenza A (H7N9) virus in adults of Shanghai, Guangzhou and Yunnan, China.
Wang W<SUP>1</SUP>, Peng H<SUP>1</SUP>, Tao Q<SUP>1</SUP>, Zhao X<SUP>2</SUP>, Tang H<SUP>1</SUP>, Tang Z<SUP>1</SUP>, Wang Y<SUP>1</SUP>, Wang Y<SUP>3</SUP>, Zhao P<SUP>4</SUP>, Qi Z<SUP>5</SUP>.
Author information: <SUP>1</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. <SUP>2</SUP>Microbiology Laboratory, Center for Disease Control and Prevention of Xuhui District, Shanghai, China. <SUP>3</SUP>National Institute for Viral Disease Control and Prevention, China CDC, Beijing, China. Electronic address: euy-tokyo@umin.ac.jp. <SUP>4</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. Electronic address: pnzhao@163.com. <SUP>5</SUP>Department of Microbiology, Shanghai Key Laboratory of Medical Biodefense, Second Military Medical University, Shanghai, China. Electronic address: qizt@smmu.edu.cn.
Abstract
BACKGROUND AND OBJECTIVE:
To investigate serologic status for novel avian influenza A (H7N9) virus in different areas in China, we examined serum samples collected in winter of 2011 from adult population of Shanghai (eastern China), Guangzhou (southern China) and Yunnan (southwest China) for the antibody responses to this virus.
STUDY DESIGN:
A total of 900 stored serum samples of adult outpatients (300 samples for each area) were subjected to anti-hemagglutinin (HA) antibodies assay using enzyme-linked immunosorbent assay (ELISA) and neutralizing antibodies assay using H7N9 pseudotyped particles (H7N9pp) and authentic H7N9 virus based neutralization test.
RESULTS:
Anti-H7 antibodies were detected in 164, 186 and 123 samples from three areas above, respectively. Among anti-H7 positive sera, 20, 42 and 13 samples had neutralizing titers of ≥10 when 8?10<SUP>2</SUP> focus-forming units (FFU) of H7N9 pseudotyped particles (pp) were adopted in neutralizing assay, respectively. When neutralizing antibodies were assayed using classic microneutralization (MN) test, MN titers of ≥10 were found in 7 samples from Guangzhou, but none from Shanghai and Yunnan.
CONCLUSION:
Low levels of protective immunity pre-existed in some general adult population of the three areas, and pre-existing immunity against H7N9 in Guangzhou appears stronger than that in Shanghai and Yunnan.
Copyright ? 2014 Elsevier B.V. All rights reserved.
KEYWORDS: H7N9, Influenza, Neutralizing antibody, Pre-existing immunity, Serology
PMID: 24793969 [PubMed - as supplied by publisher]
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