The H7N9 strain of the bird flu has now killed twenty people in China.
One hundred and two cases of the illness have been confirmed.
Health officials have still be unable to identify the source of the strain.
Unlike previous strains, H7N9 does not sicken or kill bird populations, making it a lot harder to track.
Tamiflu
can be used as a cure, as long as it is caught early enough.

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