Asian shares jumped on Wednesday as optimism about a coronavirus vaccine bolstered risk appetite while the euro rose to a four-month top on the prospect of stimulus ahead of a crucial EU summit.

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MSCI's broadest index of Asia-Pacific shares outside Japan rose 1.2 percent, edging closer to a recent five-month peak.

Japan's Nikkei added 1.5 percent to the highest since June 10 while Australia's benchmark index was up 1 percent. Chinese shares gained modestly with the blue-chip CSI300 index ticking up 0.3 percent.

E-mini futures for the S&P 500 rose 0.8 percent. Risk appetite was boosted by Moderna Inc's experimental vaccine for COVID-19 which showed it was safe and provoked immune responses in all 45 healthy volunteers in an ongoing early-stage study.

On Tuesday, the Dow Jones Industrial Average rose over 2 percent, while the S&P 500 gained 1.34 percent and the Nasdaq Composite climbed 0.94 percent.

"... the vaccine is more than a show stopper. It's the ultimate recession stopper," said Stephen Innes, markets strategist at AxiCorp.

The stock surge came despite lingering bad news about the coronavirus and after three US states reported new record daily deaths from the pandemic, while tensions continued to grow between the United States and China.

"Although a mismatch between financial markets and the real economy remains in full effect, the removal of a single recessionary input (the virus) via a vaccine can pave the way for fast economic recovery," Innes added.

"So, the positive news on the vaccine can go a long way to explain the dissonance between the shift in the stock market sentiment relative to the angst on Main Street."

Simmering tensions between the United States and China also loom large, after US President Donald Trump signed legislation and an executive order to hold China "accountable" for the national security law it imposed on Hong Kong.

The dollar was on the defensive, particularly against risk-sensitive currencies, following news of progress in vaccine development. The euro rose to as high as USD 1.1423, its strongest since March 10 and not far off its peak so far this year of USD 1.1495.

The single currency has been helped by hopes the European Union could agree at its summit later this week on a rescue financing package that will limit the economic damage to the bloc from the coronavirus pandemic.

The euro's strength helped to push the dollar index to 96.056, a one-month low. The yen was little moved at 107.27 per dollar, off a two-week high of 106.635 ahead of the Bank of Japan's policy announcement later in the day where it is expected to keep monetary policy steady. The risk-sensitive Australian dollar rose 0.5 percent to USD 0.7009.

There were still signs of wariness among investors, as yields on leading US and euro zone government debt fell and safe-haven gold prices solidified gains above USD 1,800 an ounce. Spot gold rose to USD 1,809 an ounce.

Oil prices rose on Wednesday after a sharp drop in US crude inventories. Brent crude futures were up 10 cents at USD 43 a barrel, and US crude futures rose 14 cents to USD 40.43 a barrel.

First Published:Jul 15, 2020 8:16 AM IST