1.Sensitivities of seasonal and pandemic rapid antigen tests differentiated by the level of immunofluorescence for the detection of pandemic influenza A/H1N1 2009 virus.
Ji Hyun CHO ; Hyo Yeop SONG ; Jae Hoon LEE
The Korean Journal of Internal Medicine 2013;28(4):507-509
No abstract available.
Antigens, Viral/*analysis
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Biological Markers/analysis
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DNA, Viral/analysis
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*Fluorescent Antibody Technique
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Humans
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Influenza A Virus, H1N1 Subtype/genetics/*immunology
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Influenza, Human/*diagnosis/epidemiology/immunology/virology
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*Pandemics
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Predictive Value of Tests
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Republic of Korea/epidemiology
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*Seasons
2.The significance of different sample types in study of pandemic A (H1N1) influenza diagnosis.
Fang HUANG ; Wei-Xian SHI ; Gui-Lan LU ; Shu-Juan CUI ; Yan-Ning LÜ ; Li-Li TIAN ; Hai-Kun QIAN ; Peng YANG ; Quan-Yi WANG ; Xing-Huo PANG
Chinese Journal of Preventive Medicine 2010;44(12):1079-1082
OBJECTIVETo explore the value of different types of samples, including throat swabs, stools, bloods in pandemic A (H1N1) influenza diagnosis and virus shedding patterns.
METHODSFrom May to June in 2009, 135 samples were collected from 23 confirmed cases of pandemic influenza A (H1N1) infection, including 99 throat swabs, 14 stools, 11 bloods, 1 respiratory tract washing from 13 confirmed cases and 10 blood samples from other confirmed cases. The virus was detected by real-time RT-PCR, the antibody was detected by haemagglutination inhibition assay.
RESULTSFor 99 throat swabs of 13 patients, the median time of the first positive real-time RT-PCR was 1 day (ranged from 0 to 7 days) after the onset of the symptoms of illness; the median length of time duration of positive real-time RT-PCR results from throat swabs was 3 days (ranged from 1 to 15 days). Four cases intermittently released virus. One respiratory tract washing sample was positive. In 14 stools, 8 stools were real-time RT-PCR positive, the positive rate was 57.14%. The median time of the positive real-time RT-PCR was 3 days (ranged from 1 to 4 days) after the onset of the symptoms of illness. In 21 blood samples collected at 2 to 9 days of onset, 1 blood sample was real-time RT-PCR positive, the positive rate was 4.76%. All these 21 blood samples were antibody negative.
CONCLUSIONThroat swabs and stools samples can be used as A (H1N1) influenza early diagnosis. The length of time duration of positive real-time RT-PCR in throat swabs was longer than stool samples and intermittently releasing of virus were found in throat swabs. Influenza A H1N1 cases showed the presence of small amount of viremia and antibody was negative in early blood samples (< 9 days).
Adolescent ; Adult ; Antibodies, Viral ; analysis ; Child ; China ; epidemiology ; Female ; Hemagglutination Inhibition Tests ; Humans ; Influenza A Virus, H1N1 Subtype ; immunology ; Influenza, Human ; diagnosis ; epidemiology ; virology ; Male ; Middle Aged ; Real-Time Polymerase Chain Reaction ; Reverse Transcriptase Polymerase Chain Reaction ; Virus Shedding ; Young Adult