(For a live blog on the U.S. stock market, click or type LIVE/ in a news window)
* U.S. stocks eye steepest weekly fall since 2008
* New infections increase outside China
* Microsoft warns of hit to PC business from outbreak
* GS sees no earnings growth for U.S. companies in 2020
* Indexes down: Dow 1.06%, S&P 0.97%, Nasdaq 1.28% (Updates to early afternoon)
By Medha Singh
Feb 27 (Reuters) - Wall street's main indexes tumbled for the sixth straight session on Thursday, reaching a territory that could mark a nosedive from record highs last week amid a global spread of coronavirus that intensified fears about growth and earnings.
While U.S. stocks had pared losses in early afternoon trading, the S&P 500 fell as much as 11.2% from its record closing high hit on Feb. 19 and the Nasdaq dropped 12.2% from its own peak.
The Dow Jones Industrials declined 12.1% from its Feb. 12 closing high at session lows. If the indexes end at these levels, it would confirm a correction.
The indexes were set for their steepest weekly pullback since the global financial crisis, as new infections reported around the world surpassed those in mainland China.
Governments battling the epidemics from Iran to Australia shut schools, canceled big events and stocked up on medical supplies.
In the United States, the Centers for Disease Control and Prevention confirmed an infection in California in a person who reportedly did not have relevant travel history or exposure to another known patient.
"It's not a China thing, it's becoming more global ... in terms of the spread of the virus and its economic impact," said Willie Delwiche, investment strategist at Robert W. Baird in Milwaukee.
"There's a lot of uncertainty right now about where that impact lands ... it's also possible that forecasts are over-reacting to the downside."
Microsoft Corp dropped 2.6% after it warned of weakness in PC business due to a hit to its supply chain from the coronavirus, echoing similar statements from Apple Inc and HP.
Industry analysts and economists continued to sound the alarm as they assessed the fallout of the outbreak, with Goldman Sachs saying U.S. firms will generate no earnings growth in 2020.
At 1:17 p.m. ET, the Dow Jones Industrial Average was down 285.48 points, or 1.06%, at 26,672.11, the S&P 500 was down 30.33 points, or 0.97%, at 3,086.06. The Nasdaq Composite was down 115.31 points, or 1.28%, at 8,865.46.
All of the 11 S&P sectors were trading lower with technology , financials, energy and real estate sectors losing more than 1%.
The NYSE Arca Airline index dropped 2% on fears about travel disruptions beyond China, while the Philadelphia SE Semiconductor index, comprised of China-exposed stocks, fell 1.5%.
Bucking the trend, 3M Co rose 4% after an analyst upgraded the stock, citing possible benefit from higher sales of respirator masks during the outbreak.
Declining issues outnumbered advancers for a 2.69-to-1 ratio on the NYSE and a 2.26-to-1 ratio on the Nasdaq.
The S&P index recorded four new 52-week highs and 97 new lows, while the Nasdaq recorded 23 new highs and 442 new lows. (Reporting by Medha Singh and Shreyashi Sanyal in Bengaluru; Editing Shounak Dasgupta and Arun Koyyur)