"We have already strengthened preventive measures in line with Nipah protocol," said Health Minister Veena George after chairing an emergency meeting to assess the situation.

State and local helplines are being set up to assist the public.

Officials are also being urged to check if any unnatural or unexplained deaths have occurred in recent weeks -- one of the key warning signs of a potential outbreak, she said.

Another high-level meeting will be held this evening to take stock of the evolving situation and ensure all precautions are in place.

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