The 100 billion-euro ($126 billion) rescue for Spain's banks moved Italy to the frontline of Europe's debt crisis as an initial rally in the country's bonds fizzled on concern it may be the next to succumb.

Italy's 10-year bonds reversed early gains today in the first trading after the Spanish bailout and declined for a fourth day, sending the yield up 7 basis points to 5.84 percent.

"The scrutiny of Italy is high and certainly will not dissipate after the deal with Spain," Nicola Marinelli, who oversees $153 million at Glendevon King Asset Management in London, said in an interview. "This bailout does not mean that Italy will be under attack, but it means that investors will pay attention to every bit of information before deciding to buy or to sell Italian bonds."