US STOCKS-Wall St rallies on earnings optimism
* S&P 500 earnings now expected to show Q3 growth
* UnitedHealth rises most in five years after results, outlook
* Netflix surges nearly 20 pct on strong subscriber growth
* Indexes up: Dow 0.54 pct, S&P 0.77 pct, Nasdaq 1.12 pct (Updates to late afternoon trading, changes byline)
By Chuck Mikolajczak
NEW YORK, Oct 18 (Reuters) - Wall Street rallied on Tuesday in the wake of a host of solid earnings reports that put corporate profits on track to snap a four-quarter streak of declines.
Of the 52 S&P 500 companies that have reported results to date for the third quarter, 81 percent have reported earnings that topped average analyst estimates, according to Thomson Reuters I/B/E/S.
Third-quarter earnings are now expected to show growth of 0.2 percent, which would mark an end to the U.S. profit recession that began in the third quarter of 2015.
If the quarter stays on track, it will be the first time since the fourth-quarter of 2014 in which both earnings and revenue of S&P 500 companies increased. Continuación...