美股医疗保健板块集体下挫。诺和诺德跌超19%，默沙东跌超8%，礼来跌超5%。

Group 1 - The healthcare sector in the US stock market experienced a collective decline [1] - Novo Nordisk saw a drop of over 19% [1] - Merck declined by more than 8% [1] - Eli Lilly fell by over 5% [1]