UPDATE 1-European stock futures drop as U.S., China spar over virus origin <!-- no image --> <div>European stock index futures tumbled on Monday, as investors returned from a May Day break to a fresh spat between the United States and China over the coronavirus crisis.<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=f2XmQrEeefs:fl3zmDcJpe4:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=f2XmQrEeefs:fl3zmDcJpe4:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=f2XmQrEeefs:fl3zmDcJpe4:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=f2XmQrEeefs:fl3zmDcJpe4:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=f2XmQrEeefs:fl3zmDcJpe4:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/f2XmQrEeefs" height="1" width="1" alt=""></div> Posted by Reuters