United Nations chief says teamwork is needed to stop worldwide illnesses.
Funding and supplies must be shared so all places can protect their people.
Protecting nature and animals helps prevent sickness from jumping to humans.
The world should practice early detection and quick response to any new disease.
He said every country should have doctors and tools ready to find sickness fast.
He wants people who care for animals and the environment to join the effort.
He reminded everyone that the next big illness will happen someday, so we must be ready now.
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