"Policymakers must vigilantly monitor a broad swathe of incoming economic data, prepare for contingencies, and be ready to communicate and execute policy changes at short notice," Gopinath said. "In parallel, bold, and effective international cooperation should ensure that this is the year the world escapes the grip of the pandemic."

While the IMF sees the Omicron variant weighing on growth in the first quarter, it expects the negative impact to fade starting in the second quarter, assuming that the global surge in infections abates and the virus does not mutate into new variants that require more restrictions on mobility.

Supply-chain disruptions are spurring more broad-based inflation than anticipated, the IMF said, with the annual rate projected to average 3.9% in advanced economies this year, up from a prior 2.3% estimate, and 5.9% in emerging and developing nations.

The IMF sees the faster pace for cost-of-living increases easing gradually later this year, assuming price expectations remain well anchored, as shipping bottlenecks ease and major economies respond with interest-rate increases.

Advanced economies raising interest rates may create risks for financial stability and emerging-market and developing economies' capital flows, currencies, and fiscal positions after debt levels increased, the IMF said. International cooperation will be needed to preserve nations' access to cash and facilitate orderly debt restructuring where needed, the fund said.

IMF projections:
• The fund slashed its forecast for growth in the US by 1.2 percentage points to 4%. The revision reflects removal of assumptions for a positive impact from President Joe Biden's Build Back Better social-spending plan, which stalled in Congress; earlier withdrawal of Federal Reserve support; and continued supply-chain bottlenecks.
• It trimmed China's growth forecast by 0.8 percentage point to 4.8%, citing disruptions caused by the pandemic, the nation's zero-tolerance policy for Covid-19, and disruption in the housing sector.
• The IMF cut its growth forecasts for Brazil and Mexico by 1.2 percentage points to 0.3% and 2.8%, respectively, with the fight against inflation already prompting tighter monetary policy that will weigh on domestic demand.
• India will see the fastest growth among major economies at 9% from 8.5%, due to credit-growth improvements.

The projections assume that bad health outcomes from Covid-19 recede to low levels in most countries by the end of this year, vaccination rates improve and treatments become more available. Risks are tilted to the downside, with new variants threatening to extend the pandemic.

Bringing the pandemic to an end depends on ending vaccine inequality, the IMF said. The fully vaccinated share of the population is about 70% for high-income countries but less than 4% for low-income nations. Eighty-six nations, accounting for 27% of the world's population, fell short of the 40% vaccination level for the end of last year that the IMF estimated is needed to curb the pandemic.

The world also suffers from deep inequality in Covid-19 testing, with testing rates about 80 times higher in high-income nations than low-income countries.