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U.S. stocks fell for the second day in a row Friday, which hadn’t happened in a month, as Amazon put a scare into yet another industry: medical device and health care equipment companies. That ended an eight-week winning streak for the Standard & Poor’s 500 index.

On Friday:

The Standard & Poor’s 500 index fell 2.32 points, or 0.1 percent, to 2,582.30.

The Dow Jones industrial average declined 39.73 points, or 0.2 percent, to 23,422.21.

The Nasdaq composite gained 0.89 points to 6,570.94.

The Russell 2000 index of smaller-company stocks added 0.26 points to 1,475.27.

For the week:

The S&P 500 lost 5.54 points, or 0.2 percent.

The Dow slipped 116.98 points, or 0.5 percent.

The Nasdaq shed 13.50 points, or 0.2 percent.

The Russell 2000 gave up 19.64 points, or 1.3 percent.

For the year:

The S&P 500 is up 343.47 points, or 15.3 percent.

The Dow is up 3,659.61 points, or 18.5 percent.

The Nasdaq is up 1,367.82 points, or 25.4 percent.

The Russell 2000 is up 118.14 points, or 8.7 percent.