Virology & Mycology
Open Access
ISSN: 2161-0517
ISSN: 2161-0517
Bo Liu
Chinese Center for Disease Control and Prevention, China
Posters & Accepted Abstracts: Virol Mycol
Multiple clusters of human infections with novel avian influenza A(H7N9) virus have occurred since the virus was first identified in spring 2013. However, in many situations it is unclear if these clusters result from person-to-person transmission or exposure to a common infectious source. We analyzed the possibility of person-to-person transmission in each cluster and developed a framework to assess the likelihood that person-to-person transmission had occurred. We described 21 clusters with 22 infected contact cases which were identified by the Chinese Center for Disease Control and Prevention from March 2013 through June 2015. Based on detailed epidemiological information and the timing of the contact cases��? exposures to infected persons and to poultry during their potential incubation period, we graded the likelihood of person-toperson transmission as probable, possible or unlikely. We found that person-to-person transmission probably occurred twelve times and possibly occurred four times; it was unlikely in six clusters. Probable nosocomial transmission likely occurred in two clusters. Limited person-to-person transmission likely transpired on multiple occasions since the H7N9 virus was first identified, although these transmission events represented a small fraction of all identified cases of H7N9 human infection and sustained person-to-person transmission was not documented.
Email: liubo@chinacdc.cn