Since February 28, 2020, the World Health Organization (WHO) reports two new laboratory-confirmed human cases of influenza A(H9N2) virus infections were reported from China. Both cases were in young children aged 3 and 5.
Researchers comprehensively mapped the alterations in an influenza protein that allows bird flu to grow better in people. This map may help researchers better understand which changes enable influenza to jump species and may presage a new pandemic.
Researchers compared the detection frequency of avian influenza H7 subtypes at live poultry markets in Guangdong Province, China, before and after the introduction of a bivalent H5/H7 vaccine in poultry, finding a 92 percent reduction in H7 positivity rates among poultry and a 98 percent reduction in human H7N9 cases.
Since March 2013, there were a total of 1568 human cases of avian influenza A(H7N9) reported globally (in the past six waves).
It’s not just H5N1 that has dissipated. The virus’s nearly-as-scary cousin, H7N9, emerged in China in 2013 and sickened more than 1,500 people in China over five years, killing roughly 40 percent of them.
Close interaction between avian influenza (AI) viruses and humans in Egypt appears to have resulted in many of the worldwide cases of human infections by both H5N1 and H9N2 AI viruses.
Chinese health officials reported a confirmed human H9N2 avian influenza case in a 32-year-old woman from the city of Shenzhen, Guangdong province.
This study presents evidence that closure of live bird markets, adverse publicity, and reduced prices resulted in sudden changes in movements of live poultry during H7N9 influenza epidemics. This led to significant increases in movements to neighboring provinces and other places without human cases. In these places, biosecurity and movement controls were limited and ineffective in limiting the spread of virus in poultry markets and thus resulted in human cases of the disease.
Since 2013, the H7N9 avian influenza A virus (AIV) has caused human infections and to the extent of now surpassing H5N1.
Avian influenza A(H9N2) virus isolated from a poultry worker in Pakistan in 2015 was closely related to viruses detected in poultry farms. Observed mutations in the hemagglutinin related to receptor-binding affinity and antigenicity could affect cross-reactivity with pre-pandemic H9N2 vaccine strains.