scholarly journals Observed association between the HA1 mutation D222G in the 2009 pandemic influenza A(H1N1) virus and severe clinical outcome, Norway 2009-2010

2010 ◽  
Vol 15 (9) ◽  
Author(s):  
A Kilander ◽  
R Rykkvin ◽  
S G Dudman ◽  
O Hungnes
Keyword(s):  
Clinical Outcome ◽  
Causal Relationship ◽  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Severe Disease ◽  
Specific Mutation ◽  
Mild Disease ◽  
Influenza A H1n1

Infection with the recently emerged pandemic influenza A(H1N1) virus causes mild disease in the vast majority of cases, but sporadically also very severe disease. A specific mutation in the viral haemagglutinin (D222G) was found with considerable frequency in fatal and severe cases in Norway, but was virtually absent among clinically mild cases. This difference was statistically significant and our data are consistent with a possible causal relationship between this mutation and the clinical outcome.

scholarly journals Virulence-Associated Substitution D222G in the Hemagglutinin of 2009 Pandemic Influenza A(H1N1) Virus Affects Receptor Binding

2010 ◽  
Vol 84 (22) ◽  
pp. 11802-11813 ◽  
Author(s):  
Salin Chutinimitkul ◽  
Sander Herfst ◽  
John Steel ◽  
Anice C. Lowen ◽  
Jianqiang Ye ◽  
...  
Keyword(s):  
Receptor Binding ◽  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Severe Disease ◽  
Dynamics Modeling ◽  
Receptor Specificity ◽  
Influenza A H1n1 ◽  
Antigenic Properties

ABSTRACT The clinical impact of the 2009 pandemic influenza A(H1N1) virus (pdmH1N1) has been relatively low. However, amino acid substitution D222G in the hemagglutinin of pdmH1N1 has been associated with cases of severe disease and fatalities. D222G was introduced in a prototype pdmH1N1 by reverse genetics, and the effect on virus receptor binding, replication, antigenic properties, and pathogenesis and transmission in animal models was investigated. pdmH1N1 with D222G caused ocular disease in mice without further indications of enhanced virulence in mice and ferrets. pdmH1N1 with D222G retained transmissibility via aerosols or respiratory droplets in ferrets and guinea pigs. The virus displayed changes in attachment to human respiratory tissues in vitro, in particular increased binding to macrophages and type II pneumocytes in the alveoli and to tracheal and bronchial submucosal glands. Virus attachment studies further indicated that pdmH1N1 with D222G acquired dual receptor specificity for complex α2,3- and α2,6-linked sialic acids. Molecular dynamics modeling of the hemagglutinin structure provided an explanation for the retention of α2,6 binding. Altered receptor specificity of the virus with D222G thus affected interaction with cells of the human lower respiratory tract, possibly explaining the observed association with enhanced disease in humans.

scholarly journals Ultrastructural and Histopathological Studies of 2009 Pandemic Influenza A (H1N1) Virus

2010 ◽  
Vol 16 (S2) ◽  
pp. 1122-1123
Author(s):  
CS Goldsmith ◽  
MG Metcalfe ◽  
W-J Shieh ◽  
DM Blau ◽  
DC Rollin ◽  
...  
Keyword(s):  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Influenza A H1n1 ◽  
Histopathological Studies

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

scholarly journals Effects of Vaccine Program against Pandemic Influenza A(H1N1) Virus, United States, 2009–2010

2013 ◽  
Vol 19 (3) ◽  
Author(s):  
Rebekah H. Borse ◽  
Sundar S. Shrestha ◽  
Anthony E. Fiore ◽  
Charisma Y. Atkins ◽  
James A. Singleton ◽  
...  
Keyword(s):  
United States ◽  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Influenza A H1n1

scholarly journals Influenza-Like Illness in a Community Surrounding a School-Based Outbreak of 2009 Pandemic Influenza A (H1N1) Virus-Chicago, Illinois, 2009

2010 ◽  
Vol 52 (Supplement 1) ◽  
pp. S94-S101 ◽  
Author(s):  
K. B. Janusz ◽  
J. E. Cortes ◽  
F. Serdarevic ◽  
R. C. Jones ◽  
J. D. Jones ◽  
...  
Keyword(s):  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Influenza Like Illness ◽  
School Based ◽  
Influenza A H1n1

scholarly journals High prevalence of antibodies to the 2009 pandemic influenza A(H1N1) virus in the Norwegian population following a major epidemic and a large vaccination campaign in autumn 2009

2010 ◽  
Vol 15 (31) ◽  
Author(s):  
K Waalen ◽  
A Kilander ◽  
S G Dudman ◽  
G H Krogh ◽  
T Aune ◽  
...  
Keyword(s):  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Vaccination Campaign ◽  
Age Group ◽  
Norwegian Population ◽  
Influenza A H1n1 ◽  
High Prevalence ◽  
Substantial Rise ◽  
Epidemic Wave

The prevalence of antibodies reactive to the 2009 pandemic influenza A(H1N1) was determined in sera collected before the start of the pandemic, during the early phase, and after the main epidemic wave and nationwide vaccination campaign in Norway. A substantial rise in prevalence of antibodies at protective titres, from 3.2% to 44.9%, was observed between August 2009 and January 2010. The highest prevalence, 65.3%, was seen in the age group of 10-19 year-olds.

scholarly journals Outbreak of 2009 pandemic influenza A(H1N1) in a Finnish garrison - a serological survey

2010 ◽  
Vol 15 (45) ◽  
Author(s):  
M Aho ◽  
O Lyytikaïnen ◽  
J E Nyholm ◽  
T Kuitunen ◽  
E Rönkkö ◽  
...  
Keyword(s):  
Pandemic Influenza ◽  
Military Service ◽  
Influenza A ◽  
Major Part ◽  
H1n1 Virus ◽  
Upper Respiratory Tract ◽  
Serological Survey ◽  
Influenza A H1n1 ◽  
History Of ◽  
Upper Respiratory

In September 2009, an outbreak of 2009 pandemic influenza A(H1N1) took place in a Finnish garrison. In November 2009, we performed a serological survey among 984 recruits undergoing their military service at the garrison and related the results to self-reported upper respiratory tract infection (URTI) with or without fever. Of 346 volunteers who donated a blood sample, 169 (49%) had pandemic influenza A(H1N1) virus-specific antibodies. Of those, 84 (50%) reported no recent history of URTI, suggesting that a major part of those infected with pandemic influenza A(H1N1) virus may be asymptomatic.

scholarly journals Household Transmission of 2009 Pandemic Influenza A (H1N1) Virus in the United States

2009 ◽  
Vol 361 (27) ◽  
pp. 2619-2627 ◽  
Author(s):  
Simon Cauchemez ◽  
Christl A. Donnelly ◽  
Carrie Reed ◽  
Azra C. Ghani ◽  
Christophe Fraser ◽  
...  
Keyword(s):  
United States ◽  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
The United States ◽  
Household Transmission ◽  
Influenza A H1n1
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