What is the fine-grained topic of the following text: Technical Abstract: Following the 2014-2015 outbreaks of H5N2 and H5N8 (clade 2.3.4.4) highly pathogenic avian influenza (HPAI) in the U.S., studies were performed to identify vaccines with potential to be used as a control mechanism in the event of future outbreaks. Only return the topic.
Identifying vaccines for control of future H5N2 and H5N8 avian influenza outbreaks.