Task: Translation
Input (Japanese): 木曜日のマスコミ向けの記者会見で、WHOのSpecialPandemicInfluenzaAdvisorの福田敬二氏はウィルスはここ数ヶ月特に北半球で活性化していると述べた。
Output (English): In a briefing with reporters Thursday, WHO Special Pandemic Influenza Advisor Keiji Fukuda said the virus has been particularly active in the Northern Hemisphere in recent months.