Leading virologist Professor John Oxford has said he is confident of China's ability to deal with the current outbreak of bird flu.
He told ITV News: "China is pretty organised these days ... If anyone is going to deal with it, I think they can."
But he said the outbreak is still concerning because "it has killed almost half of the people it has infected so far".
He added that it would be of much greater concern if evidence emerged of it spreading from human to human.
He also urged anyone with plans to travel to China not to cancel them, but advised staying away from poultry markets and farms.
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Some 66 people have been killed after the plane they were travelling on crashed in southern Iran.
The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.