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Resultados  1-12 de 99

Reviewing the History of Pandemic Influenza: Understanding Patterns of Emergence and Transmission.

Autor(es): Saunders-Hastings, Patrick R; Krewski, Daniel
Fonte: Pathogens;5(4)2016 Dec 06.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27929449
Resumo: For centuries, novel strains of influenza have emerged to produce human pandemics, causing widespread illness, death, and disruption. There have been four influenza pandemics in the past hundred years. During this time, globalization processes, alongside advances in medicine and epidemiology, have altered the way these pandemics are experienced. Drawing on international case studies, this paper provides a review of the impact of past influenza pandemics, while examining the evolution of our (mais)

Influenza Pandemics and Tuberculosis Mortality in 1889 and 1918: Analysis of Historical Data from Switzerland.

Autor(es): Zürcher, Kathrin; Zwahlen, Marcel; Ballif, Marie; Rieder, Hans L; Egger, Matthias; Fenner, Lukas
Fonte: PLoS One;11(10): e0162575, 2016.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27706149
Resumo: BACKGROUND: Tuberculosis (TB) mortality declined in the northern hemisphere over the last 200 years, but peaked during the Russian (1889) and the Spanish (1918) influenza pandemics. We studied the impact of these two pandemics on TB mortality. METHODS: We retrieved historic data from mortality registers for the city of Bern and countrywide for Switzerland. We used Poisson regression models to quantify the excess pulmonary TB (PTB) mortality attributable to influenza. RESULTS: Yearly PTB mor (mais)

Perceptions on the risk communication strategy during the 2013 avian influenza A/H7N9 outbreak in humans in China: a focus group study.

Autor(es): Li, Richun; Xie, Ruiqian; Yang, Chong; Frost, Melinda
Fonte: Western Pac Surveill Response J;7(3): 21-28, 2016 Jul-Sep.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27757257
Resumo: OBJECTIVE: To identify the general public's perceptions of the overall risk communication strategy carried out by Chinese public health agencies during the first wave of avian influenza A(H7N9) outbreak in humans in 2013. METHODS: Participants were recruited from communities in Beijing, Lanzhou and Hangzhou, China in May and June 2013 by convenience sampling. Demographics and other relevant information were collected using a self-administered questionnaire. Focus group interviews were condu (mais)

Dynamic Convergent Evolution Drives the Passage Adaptation across 48 Years' History of H3N2 Influenza Evolution.

Autor(es): Chen, Hui; Deng, Qiang; Ng, Sock Hoon; Lee, Raphael Tze Chuen; Maurer-Stroh, Sebastian; Zhai, Weiwei
Fonte: Mol Biol Evol;33(12): 3133-3143, 2016 Dec.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27604224
Resumo: Influenza viruses are often propagated in a diverse set of culturing media and additional substitutions known as passage adaptation can cause extra evolution in the target strain, leading to ineffective vaccines. Using 25,482 H3N2 HA1 sequences curated from Global Initiative on Sharing All Influenza Data and National Center for Biotechnology Information databases, we found that passage adaptation is a very dynamic process that changes over time and evolves in a seesaw like pattern. After cr (mais)

The matrix gene of influenza A H5N1 in Egypt, 2006-2016: molecular insights and distribution of amantadine-resistant variants.

Autor(es): Naguib, Mahmoud M; Hagag, Naglaa; El-Sanousi, Ahmed A; Hussein, Hussein Ali; Arafa, Abdel-Satar
Fonte: Virus Genes;52(6): 872-876, 2016 Dec.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27448682
Resumo: Large-scale sequence analysis of Matrix (M) gene and its coding proteins M1 and M2 was performed for 274 highly pathogenic avian influenza viruses H5N1 circulated in Egypt from 2006 to 2016. The aim is to study the amantadine-resistant markers distribution and to estimate the evolutionary rate. 246 viruses were obtained from the Global Initiative on Sharing All Influenza Data base, and 28 additional viruses were sequenced. Maximum clade credibility (MCC) phylogenetic tree revealed that the (mais)

A Role of Influenza Virus Exposure History in Determining Pandemic Susceptibility and CD8+ T Cell Responses.

Autor(es): Quiñones-Parra, Sergio M; Clemens, E Bridie; Wang, Zhongfang; Croom, Hayley A; Kedzierski, Lukasz; McVernon, Jodie; Vijaykrishna, Dhanasekaran; Kedzierska, Katherine
Fonte: J Virol;90(15): 6936-47, 2016 Aug 01.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27226365
Resumo: UNLABELLED: Novel influenza viruses often cause differential infection patterns across different age groups, an effect that is defined as heterogeneous demographic susceptibility. This occurred during the A/H2N2 pandemic, when children experienced higher influenza attack rates than adults. Since the recognition of conserved epitopes across influenza subtypes by CD8(+) cytotoxic T lymphocytes (CTLs) limit influenza disease, we hypothesized that conservation of CTL antigenic peptides (Ag-p) i (mais)

Enhanced risk of illness during the 1918 influenza pandemic after previous influenza-like illnesses in three military populations.

Autor(es): Shanks, G D; Burroughs, S A; Sohn, J D; Waters, N C; Smith, V F; Waller, M; Brundage, J F
Fonte: Epidemiol Infect;144(10): 2043-8, 2016 Jul.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 26957052
Resumo: The reasons for the unprecedented mortality during the 1918 influenza pandemic remain poorly understood. We examined morbidity records from three military cohorts from years prior to and during the 1918 pandemic period to assess the effects of previous respiratory illnesses on experiences during the pandemic. Clinical registers and morbidity lists were examined to identify all medical encounters for acute respiratory illnesses in students at two U.S. military officer training academies and (mais)

Historical and Recent Cases of H3 Influenza A Virus in Turkeys in Minnesota.

Autor(es): Guo, Xi; Flores, Cristian; Munoz-Aguayo, Jeannette; Halvorson, David A; Lauer, Dale; Cardona, Carol J
Fonte: Avian Dis;60(1 Suppl): 408, 2016 May.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27309087
Resumo: Subtype H3 influenza A viruses (IAVs) are abundant in wild waterfowl and also infect humans, pigs, horses, dogs, and seals. In Minnesota, turkeys are important and frequent hosts of IAV from wild waterfowl and from pigs. Over 48 yr of surveillance history, 11 hemagglutinin (HA) subtypes of IAV from waterfowl, as well as two HA subtypes from swine, H1 and H3, have infected turkeys in Minnesota. However, there have only been two cases of avian-origin H3 IAV infections in turkeys during this 4 (mais)

Available influenza vaccines: immunization strategies, history and new tools for fighting the disease.

Autor(es): Barberis, I; Martini, M; Iavarone, F; Orsi, A
Fonte: J Prev Med Hyg;57(1): E41-6, 2016.
MEDLINE - Literatura Internacional em Ciências da Saúde PMID: 27346939
Resumo: The main public health strategy for containing influenza-related disease is annual vaccination, which is recommended for the elderly and others belonging to risk-factor categories, who present the highest morbidity and mortality, as reported by the World Health Organization (WHO) Recommendations. The availability of different influenza vaccine formulations makes the choice of the best immunization strategy a challenge for stakeholders and public health experts. Heterogeneity in at-risk cate (mais)
Resultados  1-12 de 99