* Dollar index steady after five sessions of losses
* Yen claws back post-vaccine losses
* Graphic: World FX rates in 2020 https://tmsnrt.rs/2RBWI5E
By Tom Westbrook
SYDNEY, Nov 19 (Reuters) - The dollar nursed losses on Thursday following five sessions of declines as investors' longer-term optimism about COVID-19 vaccines ran in to worries about rising infections and risks to the fragile global economic recovery.
Small gains against most majors lifted the greenback from Wednesday's eight-session low against a basket of currencies =USD , but it remains near the month's trough of 92.129.
Surging coronavirus cases in the United States have exerted opposing forces on the dollar, with a safety bid supporting the currency while fresh speculation of monetary easing to boost the economy has undermined it.
Concern has also driven the safe-haven yen about 0.8% higher this week, recouping roughly three-quarters of the steep loss it suffered last week, when Pfizer (NYSE: PFE ) announced its COVID-19 vaccine.
The yen JPY= was steady at 103.80 per dollar and not far below its recent eight-month high of 103.18. The risk-sensitive Australian and New Zealand dollars each eased about 0.2%. AUD/
The euro EUR= has had pandemic problems of its own as lockdowns spread across the continent. It softened marginally to $1.1846.
"Immediate risks posed by the surge in infections to the U.S. and European Union economies have become too large to ignore," said economist Radhika Rao and currency strategist Philip Wee from Singapore's DBS Bank in a note on Thursday.
"Negative surprises over Brexit talks are also expected at the EU Summit today."
The Times newspaper has reported Europe's leaders would demand the European Commission publish no-deal plans as the year-end deadline neared. dipped 0.2% to $1.3237 in Asia.
"There is a very narrow range of possibilities at this point," said Stephen Innes, a Bangkok-based strategist at brokerage Axi.
"A skinny free trade agreement with potential concessions on fisheries and state-aid vs. no-deal risk," he said, with the latter potentially triggering a 10% drop in sterling.
Elsewhere the South Korean won KRW= dropped 0.6% 1,114.25 per dollar and dealers said they suspected central bank intervention after the finance minister vowed action to stabilise the currency market. Thai baht THB= also softened for a second straight day and the central bank said it had intervened to slow its recent rise. EMRG/FRX
FED TO THE RESCUE, AGAIN?
The dollar's gains in the wake of the vaccine announcement as traders quit safe haven currencies have now nearly evaporated as selling pressure returned to the greenback through this week.
With fiscal stimulus plans gone by the wayside as President Donald Trump's refusal to concede electoral defeat consumes lawmakers' attention, speculation is growing that Federal Reserve may further loosen monetary at its December meeting.
Two top Fed officials on Wednesday held out the option of doing more and Treasuries have rallied in anticipation of a possible expansion of Fed bond buying. think there is a reasonable risk that the Fed does have to do more, because the fiscal response may not come until early next year - and that's months away," said Commonwealth Bank of Australia currency analyst Joe Capurso in Sydney.
UBS Global Wealth Management likewise outlined a weaker dollar as a pillar of their 2021 forecasts this week, mostly owing to the Fed holding rates very low for a long time.
And all of that has helped to put a rocket under the Chinese yuan, which has gained more than 9% against the dollar since May - underpinned by a yawning yield gap.
U.S. jobs figures will be closely watched on Thursday for guidance on the Fed's next moves and at 1000 GMT European Central Bank President Christine Lagarde appears at a European Parliament Committee hearing in Frankfurt.
Currency bid prices at 3:48PM in Sydney (0448 GMT) Description
U.S. Close Pct Change
+103.9750 +103.7450 Euro/Yen
+123.1200 +122.8500 Dollar/Swiss
+0.9111 Sterling/Dollar GBP=D3
+1.3225 Dollar/Canadian CAD=D3
All spots FX= Tokyo spots AFX= Europe spots EFX= Volatilities FXVOL= Tokyo Forex market info from BOJ TKYFX
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