The 22-trillion-won (USD 19.8 billion) stimulus package was passed at a cabinet meeting of government ministers, the finance ministry said.
"The extra budget will help revitalise the economy and stabilise the livelihoods of ordinary people who have been affected the most by the fallout from MERS," Vice Finance Minister Bang Moon-Kyu was quoted as saying by Yonhap news agency.
As of this morning, the virus had killed 33 people and a total of 184 cases had been confirmed. Forty-two of those remain hospitalised with 12 in critical condition, according to the health ministry.
The extra expenditure is expected to raise the economic growth rate by 0.3 percentage points this year and 0.4 percentage points in 2016.
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South Korea forecasts its economy will grow 3.1 per cent this year and 3.5 per cent next year.
Moody's said consumer sentiment had plummeted as a result of MERS, halting the recovery in domestic demand, as the external sector continues to drag on growth.
"Our tracking model suggests GDP growth slowed to 2.6 per cent year over year in the second quarter, which is lower than our 2.9 per cent estimate from May", Emily Dabbs at Moody's Analytics Ltd. Said in an article this week.
Dabbs was referring to a ferry accident that claimed more than 300 lives, mostly teenagers.