China has confirmed three more cases of the H7N9 bird flu strain, one in Shanghai and two in Jiangsu Province. The latest cases have brought the total number of confirmed H7N9 cases across China to 24, including seven deaths.

The National Health and Family Planning Commission said the cases so far were isolated and there was no evidence of human-to-human transmission. Health authorities have stepped up measures to monitor the situation.

The World Health Organization is talking with the Chinese government about sending international experts to help investigate the new bird flu strain.

At the same time, China has started research for the development of a vaccine for the H7N9 bird flu virus. However, complications in the development and manufacturing process mean it may take about six to eight months before the vaccine can be brought to market.

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