France, the Netherlands and Spain announced new restrictions in order to curb rising cases of the highly contagious delta variant. In a research note Monday, Oxford Economics said that despite relatively low global Covid count, the number of economies reporting the delta variant had jumped to 89, as quoted on CNBC. Ben May, Oxford Economics’ director of Global Macro Research said the that the new strain will likely weigh on emerging market economies with less-advanced immunization programs, per the same CNBC article.“Nonetheless if economies reopen and allow cases to surge, the economic gains could prove illusory if Covid-related absences trigger major disruption to businesses and higher cases prompt greater voluntary social distancing,” May also added, CNBC revealed.Against this backdrop, below we highlight a few ETFs that could be gainful if the delta variant of Covid cases rise.iShares 710 Year Treasury Bond ETF IEFIf global covid cases rise, investors will flock to safe-haven asset U.S. treasuries, driving down the bond yields. Treasury bond ETFs will now gain. The underlying ICE U.S. Treasury 7-10 Year Bond Index of the fund IEF measures the performance of public obligations of the U.S. Treasury that has a remaining maturity of greater than seven years and less than or equal to ten years.SPDR Gold Shares (GLD)Gold is a classic safe-haven asset. The metal was under pressure in recent times which calls for decent valuation too. The likely rise on delta variant of Covid cases may boost the metal’s value ahead. Plus, inflation rate is rising in the United States and gold is viewed as a hedge against inflation (read: Best ETF Investing Areas to Watch Out For in 2H21).Liberty US Low Volatility ETF FLLVIn the current edgy investing backdrop, lure for low-volatility and high-quality ETFs will remain in place. Any deterioration in the virus outlook may bring back the lull in the market and low-volatility ETFs may benefit out of it. Notably, the ETF FLLV is active and does not track a benchmark. The fund yields 1.48% annually.Consumer Staples Select Sector SPDR ETF XLPStaples in a non-cyclical and defensive sector. It will likely fare better if there are any disruptions in the economic recovery due to global rise in virus cases. The underlying Consumer Staples Select Sector Index looks to provide a representation of the consumer staples sector of the S&P 500 Index.Technology Select Sector SPDR ETF (XLK)The dovish Fed minutes dragged down the treasury yields in recent times, which benefitted tech stocks as these are high-growth in nature. Moreover, fears of delta variant of COVID-19 are also causing higher demand for the tech stocks as these are winning ones amid the stay-at-home trend. Plus, the sector has solid long-term potential (read: 3 Sector ETFs That Have More Room for Growth in Q3). Infrastructure Stock Boom to Sweep America A massive push to rebuild the crumbling U.S. infrastructure will soon be underway. It’s bipartisan, urgent, and inevitable. Trillions will be spent. Fortunes will be made. The only question is “Will you get into the right stocks early when their growth potential is greatest?” Zacks has released a Special Report to help you do just that, and today it’s free. Discover 7 special companies that look to gain the most from construction and repair to roads, bridges, and buildings, plus cargo hauling and energy transformation on an almost unimaginable scale.Download FREE: How to Profit from Trillions on Spending for Infrastructure >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report SPDR Gold Shares (GLD): ETF Research Reports Technology Select Sector SPDR ETF (XLK): ETF Research Reports Consumer Staples Select Sector SPDR ETF (XLP): ETF Research Reports iShares 710 Year Treasury Bond ETF (IEF): ETF Research Reports Franklin Liberty U.S. Low Volatility ETF (FLLV): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research