Authorities have culled more than 175,000 birds this winter to stamp out local outbreaks of H7N9 and other avian flu strains. Open-air markets, where eggs and birds are sold in crowded and unsanitary conditions, are hotbeds of infection and can spread the disease into the wider community. Animals that are clearly sick or that have died of diseases or died unexpectedly should not be eaten. Nevertheless, until present, there is still no report on the efficacy and effectiveness of oseltamivir in treatment of new H7N9 influenza. According to the , of the 28 patients who had survived their infections, 19 illnesses were severe and 9 were mild. The cumulative total of laboratory-confirmed cases since the first epidemic is 1,223. Influenza virus infection is a common respiratory pathogen.
Good food safety and food hygiene practices e. The director of the Chinese National Influenza Center, Shu Yuelong, said a large-scale H7N9 epidemic still remains unlikely because the virus has not yet mutated in such a way that would allow person to person transmission. H7N9 may also spread beyond China's borders, either through the poultry trade or through migratory birds. While H7N9 seems to cause little to no signs of illness in birds, standard, good biosecurity and hygiene measures will still help protect animals and people from this and other influenza viruses in general. H7N9 is a type A influenza virus that affects birds and poultry and does not normally infect humans. The remaining six viral genes likely originated from two distinct subgroups of an H9N2 sub-lineage circulating in poultry in Eastern China.
To date, a majority of those infected with H7N9 have contracted it from infected birds and poultry. Wash and disinfect all surfaces and utensils that have been in contact with raw meat. These include cough, high fever 38°C or higher and shortness of breath. Sites include live bird markets, intensive production sites and smallholder sites. In contrast, highly pathogenic avian influenza viruses, like some H5N1 strains, cause severe disease and high mortality in chickens. Total cases count reached 108 with 22 deaths.
Despite its high mortality rate, H7N9 had gotten less attention of late than two other new strains—H5N8 and H5N6—, killing or forcing authorities to cull millions of poultry. Combined with the emergence of already partially adapted phenotypes and the relatively high fitness of oseltamivir-resistant H7N9 viruses, these novel viruses pose a significant pandemic threat. Retrieved from Avian influenza A H7N9 virus. There are also ongoing efforts to develop and use H7N9 vaccines among poultry in China. And that's what makes it different and concerning for us.
On April 25, the National Health and Family Planning Commission said that a total of 109 H7N9 cases had been reported within mainland China, including 23 deaths. In some of these clusters, H7N9 infections occurred in blood-related family members, implying that close contacts in household settings, and perhaps also genetic factors, may be risk factors for infection with H7N9 viruses. The pattern of human transmission remains mysterious. Tracing back allows authorities to: i better understand the extent of virus spread; ii help identify the source of infection; and iii target and implement appropriate control measures. Veterinarians and other service providers who travel from site to site risk spreading disease if good biosecurity measures are not practiced. Morbidity and Mortality Weekly Report. On April 24, a case was confirmed by the Taiwanese Government, marking the first case outside of China.
Six internal genes originated with at least two chicken viruses. Poultry trading areas in two other areas of the district were also closed. China has already begun this activity. Upper respiratory tract symptoms such as sore throat or coryza are less common. Please do not disregard the professional advice of your physician. The source of infection has not yet been confirmed. The risk to public health is low; however, the pandemic potential of this virus is concerning.
The virus causes serious respiratory symptoms, including severe pneumonia. While there is no immediate threat of human-to-human spread of H7N9, Dr Low cautions against complacency. The available epidemiological and virological information strongly indicates that most known human H7N9 infections result from direct contact with infected poultry, or indirect contact with infected poultry for example, by visiting wet markets and having contact with environments where infected poultry have been kept or slaughtered. But unless the virus begins to spread more easily among people, infected birds present the greatest hazard. What are appropriate hygiene measures to be implemented in live bird markets? China became the present epidemic focus of this new emerging disease.
A disease that can pass from an animal to a human is called a zoonotic disease. This is why a new variant causes more serious illness. Archived from on 4 October 2013. For avian influenza A H5N1 virus infections in humans, current data indicate an incubation period averaging 2 to 5 days and ranging up to 17 days1. This is why a new variant causes more serious illness. C Human cases of H7N9 influenza virus infection by age- and gender-groups. On April 18, China reported 87 confirmed cases.