NEW YORK: The dollar gained on Wednesday as a rise in coronavirus cases in the United States weighed on optimism about a quick economic recovery, and as the US weighed tariffs on European products.

Arizona, California, Mississippi and Nevada on Tuesday reported record numbers of new cases of Covid-19, the disease caused by the novel coronavirus, while Texas set a record on Monday.

"The positive market mood during yesterday's North American session on economic rebound optimism stalled overnight as concern may be building in overseas markets over rising Covid-19 case counts in the US," analysts at Scotiabank said in a report.

The dollar index gained 0.33% to 96.45. It has fallen from a three-year high of 102.99 in March.

The euro fell 0.32% to $1.1270. It had reached a one-week high of $1.1348 on Tuesday after data showed that a downturn in the euro zone economy eased again this month.

The greenback rose 0.19% to 106.71 Japanese yen. It fell as low as 106.06 yen on Tuesday, the weakest since May 7.

The New Zealand dollar underperformed after the country's central bank said the balance of economic risks remains to the downside and that it is prepared to use additional monetary tools as necessary.

The kiwi was last down 0.91% at $0.6430.