An official from West Java's Maritime, Agriculture and Food Sovereignty injects a vaccine to a duck during an operation that aims to prevent bird flu virus from spreading at Sekarwangi village in Soreang, West Java, Indonesia, Feb. 24, 2017. The West Java city administration maintained an alert on possible spread of the bird flu virus following the deaths of about 765 infected chickens in Sekarwangi since Feb. 1, 2017. No humans were reported to be infected by the bird flu since then. (Xinhua/Banyu Biru)