The CDC reports concern about a new influenza strain designated A/Bali/2/2010 (H5N2). This nomenclature means

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The nomenclature for influenza viruses includes the type (A, B, or C), the location where the virus was first isolated, the strain number, the year of isolation, and the HA and NA subtypes. In this case, the virus is a type A virus (designated by the "A" in the nomenclature), it was first isolated in Bali (designated by the "Bali" in the nomenclature), it is the second strain of influenza A virus isolated in Bali in 2010 (designated by the "2/2010" in the nomenclature), and it has HA subtype 5 and NA subtype 2 (designated by the "H5N2" in the nomenclature).

The CDC Reports Concern About a New Influenza Strain Designated