US STOCKS-Wall St to open slightly lower on Amazon results, Ebola worry
* Amazon tumbles, Microsoft climbs after earnings
* New home sales data due (Adds quote, updates prices)
By Chuck Mikolajczak
NEW YORK, Oct 24 (Reuters) - U.S. stocks were set for a slightly lower open on Friday, putting the S&P 500 on track to cut its weekly advance, following disappointing earnings from Amazon and as the first diagnosed case of Ebola in New York City raised concerns about the spread of the virus.
Amazon plunged 9.5 percent to $283.40 in premarket trade after the online retailer's sales projections for the crucial holiday quarter disappointed Wall Street and third-quarter results missed forecasts.
Microsoft, up 4.6 percent at $47.09 before the opening bell, may help curb declines after it reported higher-than-expected quarterly revenue while keeping its profit margins largely intact.
Procter & Gamble gained 2.4 percent to $85.22 in premarket after the world's largest household products maker posted quarterly results and said it would split its Duracell battery business into a separate company.
The S&P 500 is up 3.4 percent for the week, putting the index on pace for its first weekly gain in five, powered largely by solid corporate earnings reports. The benchmark index is down 3 percent from its record high on Sept. 18.
"The market is nervous, people are really paying attention now, you've seen volatility come back big time," said John De Clue, chief investment officer of the Private Client Reserve at U.S. Bank Wealth Management in Minneapolis, Minnesota. Continuación...