John Lennon once sang a song titled "Nobody Loves You (When You're Down and Out)." That sentiment seems to be especially relevant today with the major Wall Street indexes in bear market territory.

Many investors have turned their backs on once high-flying stocks and exchange-traded funds (ETFs). But some of these down-and-out securities deserve a little love, and there's at least one ETF that's still a screaming bear-market buy.

The SPDR S&P Biotech ETF (NYSEMKT: XBI) ranks as the second-largest ETF focusing on biotech stocks based on assets under management. It's designed to track the performance of the S&P Biotechnology Select Industry Index. This index uses a modified equal weighting of around 150 biotech stocks.

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Source Fool.com