Abstract
The aim of this review was to summarise the information about the cases of highly pathogenic avian influenza in Bulgaria during the last two decades. According to the EMPRES-I FAO data, from January 2006 to the end of 2019, 141 HPAI outbreaks have been registered in Bulgaria, with two identified virus serotypes (H5N1 and H5N8). The H5N1 outbreaks were reported in 2006, 2010 and 2015. Almost all H5N1 cases were observed in wild birds, with only one outbreak in domestic chickens in a backyard farm in 2015. From 2016 to the end of 2019, 132 outbreaks of HPAI identified as H5N8 were recorded: sixteen in wild birds and the other 116 - in domestic poultry. Large farms with fattening ducks used for foie gras production in four administrative districts (Plovdiv, Haskovo, Stara Zagora, Dobrich) were mainly affected.
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