By Melissa Gray and Miriam Falco, CNN.
(CNN) — The number of bird flu cases in China jumped Sunday to 102, including 20 deaths, the World Health Organization announced.
Seventy patients remain hospitalized with the virus. The WHO said there is still no evidence of human-to-human transmission.
At last count on Friday, there were 87 cases.
The current strain of bird flu, H7N9, was not detected in humans until three weeks ago.
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