However , the case turned out to be a conventional strain of influenza A subtype H3N2 ( Hong Kong A strain ) .
On 30 April 2009 , the first suspected case was detected at Narita Airport .
The case turned out to be a conventional strain of influenza A subtype H3N2 ( Hong Kong A strain ) .
On 30 April 2009 , the first suspected case was detected at Narita Airport .