| 1 | These birds should also not be used for animal feed. | |
| 2 | H5N1 avian influenza is still essentially a disease of birds. | |
| 3 | Most recently, H5N1 also has been detected in birds in Russia. | |
| 4 | Local agricultural authorities also found evidence of H5 infection in household birds. | |
| 5 | As in Asia, contact with infected birds is the principal source of infection. |
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