نتایج جستجو برای: influenza a h7n9 virus
تعداد نتایج: 13592173 فیلتر نتایج به سال:
BACKGROUND On 31 March 2013, the first human infections with the novel influenza A/H7N9 virus were reported in Eastern China. The outbreak expanded rapidly in geographic scope and size, with a total of 132 laboratory-confirmed cases reported by 3 June 2013, in 10 Chinese provinces and Taiwan. The incidence of A/H7N9 cases has stalled in recent weeks, presumably as a consequence of live bird mar...
Adaptation of zoonotic influenza viruses towards efficient human-to-human transmissibility is a substantial public health concern. The recently emerged A/H7N9 influenza viruses in China provide an opportunity for quantitative studies of host-adaptation, as human-adaptive substitutions in the PB2 gene of the virus have been found in all sequenced human strains, while these substitutions have not...
During surveillance for pneumonia of unknown etiology and sentinel hospital-based surveillance in Beijing, China, we detected avian influenza A(H7N9) virus infection in 4 persons who had pneumonia, influenza-like illness, or asymptomatic infections. Samples from poultry workers, associated poultry environments, and wild birds suggest that this virus might not be present in Beijing.
On 31 March 2013, Chinese public health authorities notified the World Health Organization of the isolation of influenza A(H7N9) virus from 3 critically ill adults (1). This avian influenza virus had never before been detected in humans, and its association with severe disease electrified influenza experts. Could this foreshadow a pandemic? The cases generated many questions for public health a...
Human cases of avian influenza A (H5N1) virus infection were first documented in Hong Kong in 1997 [1, 2]; the virus reemerged in 2003 to spread intercontinentally and become entrenched in poultry in other parts of Asia and Egypt. Sporadic human cases with an estimated case fatality rate close to 60% continue to occur [3]. Influenza A(H1N1) pdm09 virus first emerged in 2009 as a novel swine-ori...
Although several studies have reported seroprevalences of antibody against avian influenza A(H7N9) virus among poultry workers in southern China, results have varied and data in northern China are scarce. To understand risks of H7N9 and H5N1 virus infections in northern China, a serological cohort study was conducted. Poultry workers, swine workers and the general population in Beijing, China, ...
n engl j med 368;20 nejm.org may 16, 2013 1864 critical in implementing successful prevention and control activities. The detection of human H7N9 virus infections is yet another reminder that we must continue to prepare for the next influenza pandemic. The coming weeks will reveal whether the epidemiology reflects only a widespread zoonosis, whether an H7N9 pandemic is beginning, or something i...
Closure of live poultry markets was implemented in areas affected by the influenza virus A(H7N9) outbreak in China during winter, 2013-14. Our analysis showed that closing live poultry markets in the most affected cities of Guangdong and Zhejiang provinces was highly effective in reducing the risk for H7N9 infection in humans.
Avian influenza A (H7N9) virus, the latest avian influenza virus strain was once considered a relatively rare cause of infection and low pathogenic. This novel virus spreading among three cases was firstly reported on 31 March 2013 in eastern China. By 31 March 2013, the number of laboratory-confirmed influenza H7N9 virus infections reached 132, with 37 deaths. There are age and gender differen...
Since March 2013, three waves of human infection with avian influenza A(H7N9) virus have been detected in China. To investigate virus transmission within and across epidemic waves, we used surveillance data and whole-genome analysis of viruses sampled in Guangdong during 2013-2015. We observed a geographic shift of human A(H7N9) infections from the second to the third waves. Live poultry market...
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