周五盘中，默沙东（Merck & Co，股票代码：MRK）股价大幅下挫5.01%，投资者对美国总统特朗普可能对制药行业征收新关税的警告以及中美贸易战升级的担忧做出反应。
此次股价下跌主要受三个因素影响：首先，特朗普威胁将对制药行业征收高额关税，这直接打击了包括默沙东在内的制药股。其次，中国宣布对美国商品征收报复性关税，导致整体市场情绪恶化。最后，由于这些宏观经济因素，制药行业整体呈现下跌趋势。
值得注意的是，默沙东并非唯一受影响的制药公司。行业内其他知名企业如百健（Biogen）、辉瑞（Pfizer）和礼来（Eli Lilly）的股价也出现不同程度的下跌。这反映出投资者对整个制药行业前景的担忧，特别是在面临潜在的新关税政策时。在此背景下，投资者正密切关注美国政府的后续政策动向以及中美贸易关系的发展。
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