By Josie Cox 

European markets edged lower Friday ahead of the results of sweeping EU bank stress tests, with traders' moods darkened by news that a case of Ebola was confirmed in New York City overnight.

By midmorning, the Stoxx Europe 600 was trading 0.3% lower, mirroring declines on most major country indexes, after a three-session winning streak.

Sunday, scorecards for around 150 lenders are scheduled to be made public in a choreographed series of announcements in London, Frankfurt and other financial capitals across the continent, designed to shine light on how strong balance sheets are and how capable banks are of surviving a deteriorating economic environment.

"Following our assessment of several banking systems in a series of reports published over the past year, we have identified vulnerabilities in some banks in Italy, Greece, Portugal and Germany, while most banks in Spain and France appear well positioned," credit analysts and economists at Barclays wrote in a note.

Earlier this week, Gildas Surry, an analyst at BNP Paribas SA, said he expects a dozen small banks, including Austria's Oesterreichische Volksbanken AG and Irish state-controlled lender Permanent TSB, to fail the tests. Both declined to comment.

Mr. Surry also said as many as 19 other banks will technically fail the test but have raised enough capital since the end of 2013 to satisfy regulators and avoid further action.

Elsewhere Friday, Ebola reappeared on the market's radar after a doctor who had recently returned to the U.S. from West Africa tested positive for the virus.

Overall, at least 9,936 people have now been infected with Ebola due to the West African outbreak, according to the World Health Organization but Kit Juckes, a strategist at Société Générale in London said while the news of the latest case is "depressing", the ripple effect is unlikely to reach beyond a dip in U.S. equity futures.

The S&P 500 was indicated opening 0.2% lower at 1,941.90. Futures, however, don't necessarily reflect moves after the opening bell.

Corporate earnings also provided little solace for markets Friday.

After the U.S. market close Thursday, retail company Amazon.com Inc. reported a net loss of $437 million in the third quarter, worse than its year-earlier loss of $41 million.

In Europe Friday, Germany's BASF SE lowered its outlook for 2015 and reported a 4.8% decline in third-quarter profit, hurt by the slowing global economy and weaker demand in Europe.

In the U.K. retail space, Tesco PLC's credit rating was cut to Baa 3 from Baa 2 by Moody's Investors Service Inc. Thursday after the market close, taking the company to the cusp of junk and sending its shares close to the bottom of the FTSE index in early trading Friday.

"While in our opinion Tesco has a number of levers it can pull to enhance its financial flexibility and has no material debt maturities over the next two years, we don't expect to see too many investors adding the name to their portfolios for now," credit strategists at Mitsubishi UFJ Securities wrote in a note.

In currency markets Friday, the euro was broadly flat against the U.S. dollar at $1.2648. Sterling rose marginally against the dollar to $1.6056, after figures showed that the economy had expanded a quarterly 0.7% in the third quarter and 3% on the year, in line with expectations.

Ben Brettell, an economist at Hargreaves Lansdown said although the figures mark a slowdown from the previous quarter this should not be a cause for concern.

"The broad picture remains positive. Growth is still strong at 3.0% year-over-year, and the International Monetary Fund recently forecast the U.K. economy will outstrip the rest of the developed world over 2014 as a whole," Mr. Brettell said.

"The data are a reminder that the U.K. economy continues to perform well, " BNP Paribas economist Colin Bermingham echoed.

In commodity markets, Brent crude was trading 0.7% lower on the day at $86.25 a barrel, while gold edged 0.3% higher to $1,232.70 a troy ounce.

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