scholarly journals 2009 pandemic influenza A(H1N1) virus in Scotland: geographically variable immunity in Spring 2010, following the winter outbreak

2010 ◽  
Vol 15 (24) ◽  
Author(s):  
W E Adamson ◽  
S Maddi ◽  
C Robertson ◽  
S McDonagh ◽  
P J Molyneaux ◽  
...  
Keyword(s):  
Older People ◽  
Pandemic Influenza ◽  
Influenza A ◽  
H1n1 Virus ◽  
Age Groups ◽  
Older Individuals ◽  
Serum Samples ◽  
Younger Adults ◽  
Influenza A H1n1

We determined the age- and location-specific seroprevalence of antibodies against 2009 pandemic influenza A(H1N1) virus in Scotland following the first two waves of infection. Serum samples collected following the winter outbreak were analysed by microneutralisation assay. The proportion of positive sera varied significantly between cities and, in the case of Inverness, between age groups (with younger adults more likely to be positive than older individuals). This study demonstrates that older people are no longer more likely to have antibodies against the virus than younger adults.

scholarly journals Detection of 2009 pandemic influenza A(H1N1) virus Infection in different age groups by using rapid influenza diagnostic tests

2011 ◽  
Vol 6 (3) ◽  
pp. e30-e34 ◽  
Author(s):  
Fengxiang Gao ◽  
Carol Loring ◽  
Michael Laviolette ◽  
Denise Bolton ◽  
Elizabeth R. Daly ◽  
...  
Keyword(s):  
Virus Infection ◽  
Pandemic Influenza ◽  
Diagnostic Tests ◽  
Influenza A ◽  
H1n1 Virus ◽  
Age Groups ◽  
Influenza A H1n1 ◽  
H1n1 Virus Infection

scholarly journals Residual immunity in older people against the influenza A(H1N1) – recent experience in northern Spain

2009 ◽  
Vol 14 (39) ◽  
Author(s):  
E Pérez-Trallero ◽  
L Piñeiro ◽  
D Vicente ◽  
M Montes ◽  
G Cilla
Keyword(s):  
Pandemic Influenza ◽  
Influenza A ◽  
Seasonal Influenza ◽  
H1n1 Virus ◽  
Influenza Pandemic ◽  
Age Groups ◽  
H3n2 Virus ◽  
Recent Experience ◽  
Northern Spain ◽  
Influenza A H1n1

The 2009 pandemic influenza A(H1N1) virus has a higher incidence in children and young adults, a pattern that has also been reported in seasonal influenza caused by the influenza A(H1N1) virus. We analysed age at infection in symptomatic patients with influenza in the Basque Country (northern Spain), reported through the sentinel influenza surveillance system which monitors 2.2-2.5% of the population. Between September 1999 and August 2009, influenza A(H3N2) or seasonal influenza A(H1N1) was detected in 941 patients, and from April to August 2009, pandemic influenza A(H1N1) was detected in 112 patients. The H3/H1 seasonal influenza ratio was between 3.3 and 3.4 in the under 60 year-olds, but 9.8 in older individuals, suggesting that people born before 1950 have residual immunity against the influenza A H1N1 subtype (both seasonal and pandemic). Introduction In 1957, the Asian influenza pandemic was caused by influenza A(H2N2) virus, which circulated until 1968 when it was displaced by the influenza A(H3N2) virus which was responsible for the Hong Kong pandemic. Before 1957, direct descendants of the influenza A(H1N1) virus that had caused the 1918 pandemic (Spanish flu) had circulated. In 1977, an influenza A(H1N1) strain re-emerged, which, together with the dominant influenza A(H3N2) strain, has been the cause of seasonal human influenza for more than three decades [1]. Despite the prolonged co-circulation of both subtypes, few studies have analysed their ability to affect distinct age groups. The current pandemic influenza A(H1N1) virus, influenza A(H1N1)v, which emerged in the spring of 2009, has spread throughout the world. The aim of this study was to compare the distribution in distinct age groups of infections caused by the two subtypes of seasonal influenza in the past 10 seasons and refer therelate this to recent infections due to influenza A(H1N1)v.

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 Seroprevalence study in Vojvodina (Serbia) following 2009 pandemic influenza A(H1N1)v

2012 ◽  
Vol 140 (11-12) ◽  
pp. 751-755
Author(s):  
Vladimir Petrovic ◽  
Zorica Seguljev ◽  
Jasminka Nedeljkovic ◽  
Mioljub Ristic
Keyword(s):  
Pandemic Influenza ◽  
Hemagglutination Inhibition ◽  
Influenza A ◽  
Herd Immunity ◽  
Age Groups ◽  
Immunization Coverage ◽  
Control Group ◽  
Study Objective ◽  
Seroprevalence Study ◽  
Influenza A H1n1

Introduction. The seroprevalence study was performed in Vojvodina during May and June 2010 in order to asses the effects of the 2009 pandemic influenza A(H1N1)v epidemic on herd immunity. It was a part of the Serbian Ministry of Health funded nationwide study. Objective. Prevalence of antibodies against 2009 pandemic influenza A(H1N1)v was determined in a 1% sample of the population monitored for influenza-like illness and acute respiratory infections in Vojvodina through sentinel surveillance system. Methods. The study sample involved a total of 1004 inhabitants of Vojvodina. The control group consisted of randomly selected and age-adjusted 1054 sera collected in the pre-pandemic period. Sera were tested by the reaction of hemagglutination inhibition using influenza A/California/7/2009 (H1N1) antigen in dilution from 1:8 to 1:256. Antibody titers ?1:32 and ?1:8 were considered protective and diagnostic, respectively. Results. The differences between control and study sera in all age groups were significant for both diagnostic ?1/8 and protective titres ?1/32 of hemagglutination inhibition antibodies (chi square test, p<0.001). The highest percentage of seropositive subjects was registered in the age group 15-19 years followed by children aged 5-14 years. Both diagnostic and protective titres were about twice higher in the vaccinated as compared to the non-vaccinated group. There were no statistically significant differences in seroprevalence between seven districts of Vojvodina. Conclusion. The 2009 pandemic influenza A(H1N1)v epidemic significantly influenced the herd immunity in our population regardless of low immunization coverage with highest immunity levels in adolescents aged 15-19 years and with similar herd immunity levels in all the regions in the province six months after the outbreak.

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.

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