US tech giants Apple and Google have said that they are offering health authorities around the world their platform for coronavirus contact tracing, a key tool in trying to tame the pandemic.

"The work public health officials are doing around the world humbles us all," the two companies said in a statement.

"Google and Apple are clear that this is not a panacea but we do believe Exposure Notifications can make a contribution to the broader work of contact tracing," they said.

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