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In March, the ECB started buying 60 billion euros worth of euro zone government bonds a month to inject more cash into the economy and reverse a trend of falling prices.
"We are seeing that ... we have stopped the negative bank lending rates and are starting to get new credit into the economy through the banking system," Mersch told Luxembourg radio.
"But we also see ... we also have an effect on inflation, because at the same time there was a risk that Europe would slip into deflation," he said.
He said that while cyclical factors in the economy also played a part, "at the ECB we are quite satisfied, that we have taken the right measures at the right time and that is probably why they were more effective."
The ECB's bond buying program is set to last at least until September 2016, but some economists have speculated that given its early positive effects, the bank may be tempted to cut it short. Mersch said there were no such plans.
He said the ECB expected euro zone inflation would stay close to zero until autumn of this year, before starting to rise towards the end of the year towards 1.5 percent.