NEW YORK, Aug 9 (Reuters) - The U.S. dollar index was little changed on Monday as investors assessed how rising COVID-19 cases in the United States might affect the outlook for the economy. Earlier, bitcoin hit its highest in nearly three months. It was last up 4.3% at $45,726.71, while Ether was up 3.4% at $3,117.10. The U.S. dollar index, which measures the greenback against a basket of currencies, was last up 0.07% at 92.916 , near its four-month high of 93.194. Data Monday showed U.S. job openings jumped to a fresh record high in June and hiring increased. That came on the heels of Friday"s U.S. monthly jobs report that showed U.S. employers hired the most workers in nearly a year in July and continued to raise wages. read more The report pushed bond yields higher on the view that the Federal Reserve may act more quickly to tighten U.S. monetary policy. Fed officials have made a jobs market recovery a condition of tighter monetary policy. read more "The market is struggling to balance signs of a stronger jobs market with rising Delta concerns," said Adam Button, chief currency analyst at ForexLive. "Those opposing forces have left it largely unchanged." The dollar rose sharply following Friday"s jobs report. COVID-19 infections in the United States rose by at least 22,783 on Sunday to 35.94 million total cases, according to a Reuters tally. The impact of the Delta variant in the United States has added to concerns as COVID-19 cases also are rising across Asia. Against the dollar, the euro was down 0.2%. The Japanese yen was little changed versus the greenback at 110.26 per dollar, while sterling was last trading at $1.3852, down 0.14% on the day. Sharply lower oil prices weighed on the commodity-linked Australian dollar , which eased 0.2% to US$0.7334. Speculators cut their net long dollar positions in the latest week, data showed on Friday, but they are still positioned for its gains. ======================================================== Currency bid prices at 11:03AM (1503 GMT) Description RIC Last U.S. Close Previous Session Pct Change YTD Pct Change High Bid Low Bid Dollar index 92.9160 92.8710 +0.07% 3.262% +92.9620 +92.7180 Euro/Dollar $1.1744 $1.1763 -0.16% +0.00% +$1.1769 +$1.1741 Dollar/Yen 110.2650 110.2350 +0.05% +0.00% +110.3300 +110.0300 Euro/Yen 129.49 129.65 -0.12% +0.00% +129.6700 +129.4000 Dollar/Swiss 0.9193 0.9152 +0.48% +0.00% +0.9197 +0.9147 Sterling/Dollar $1.3852 $1.3875 -0.18% +0.00% +$1.3894 +$1.3846 Dollar/Canadian 1.2581 1.2552 +0.24% +0.00% +1.2588 +1.2532 Aussie/Dollar $0.7335 $0.7355 -0.27% +0.00% +$0.7364 +$0.7329 Euro/Swiss 1.0797 1.0758 +0.36% -0.09% +1.0799 +1.0757 Euro/Sterling 0.8476 0.8475 +0.01% -5.16% +0.8486 +0.8462 NZ Dollar/Dollar $0.7000 $0.7011 -0.14% -2.51% +$0.7026 +$0.6980 Dollar/Norway 8.9485 8.8995 +0.67% +0.00% +8.9570 +8.9075 Euro/Norway 10.5099 10.4590 +0.49% +0.41% +10.5184 +10.4449 Dollar/Sweden 8.7046 8.6640 +0.25% +6.20% +8.7099 +8.6597 Euro/Sweden 10.2242 10.1985 +0.25% +0.00% +10.2263 +10.1886 Additional reporting by Tommy Wilkes in London; editing by David Holmes, Tomasz Janowski and Jonathan Oatis Our Standards: The Thomson Reuters Trust Principles.