美国制造基因蚊子，提前制造疫苗，中国基孔肯雅热是美国人干的？

Group 1 - The core issue is the outbreak of Chikungunya virus in China, specifically in Guangdong province, attributed to mosquitoes, with no effective treatment available [1][2] - The United States had developed a vaccine for Chikungunya virus five months prior to the outbreak in China [3] - The Federal Reserve's decision to maintain interest rates in the range of 4.25% to 4.5% has led to significant changes in global capital markets, causing a capital harvesting effect in emerging markets [1][5] Group 2 - The Federal Reserve's choice to keep interest rates unchanged was unexpected, as the market anticipated a quick rate cut due to high rates [5] - The combination of the Federal Reserve's monetary policy and the biological threat posed by the virus is influencing the direction of China-U.S. trade relations [4]