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South Korea's agriculture ministry raised the country's bird flu alert status to the highest level for the first time on Thursday as the disease has spread quickly nationwide.

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The Ministry of Agriculture, Food and Rural Affairs said in a statement that it will come up with detailed measures after consulting with related ministries.

Since the first bird flu case was reported about a month ago, the country, Asia's fourth-largest economy, has culled over 12 percent of its total poultry population to contain the spread of the deadly virus.