Abstract:
This study was to determine the stability of 10[superscript 9] 50% embryonated lethal dose per milliliter (ELD[subscript 50] /ml) of isolated H5N1 avian influenza virus (AIV) from epidemic areas in Thailand in 2004 on various conditions including disinfectants (gluataraldehyde, phenol, benzalkonium chloride and formalin), temperature (55 degree Celsius, 60 degree Celsius, 65 degree Celsius, 70 degree Celsius and 75 degree Celsius for 10, 15, 30, 45 and 60 minutes) and pH (3, 5, 7, 9 and 12 for 5 and 10 min). The disinfectants were diluted according to the manufacturers recommendations except formalin was diluted at 1% concentration. The diluted disinfectants were stored at 25 degree Celsius and 37 degree Celsius for 0, 5, 7 and 14 days. The treated H5N1 AIV was inoculated into six 11-day-old embryonated chicken eggs, which were observed for 7 days after inoculation. The results revealed that the H5N1 AIV (10[superscript 9] ELD[subscript 50] /ml) was effectively inactivated by glutaraldehyde and by temperature at 60 degree Celsius for 60 minutes or higher than 60 degree Celsius. All pH range could not inactivate the H5N1 AIV.