Thirteen countries have confirmed cases of the H1N1 swine flu virus as of Friday -- the latest emerging from Denmark and Hong Kong -- while the United States' total number of cases escalated to 141.

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More cases of swine flu were reported in the U.S. and abroad and officials took new steps to contain the spread of the illness. Health experts assess the latest news and explain what the public needs to know.

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The Chinese government has said it detained 22 people suspected of operating an underground network that added the industrial chemical melamine to milk. The contamination has sickened more than 50,000 children in China.

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The World Health Organization launched an investigation Wednesday into the deaths of six family members in Indonesia who may have died as a result of human-to-human transmission of the bird flu.

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Despite requests from the World Health Organization and other international health bodies, China is still not sharing virus samples from animals infected with the H5N1 strain of the bird flu.

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World Health Organization officials announced Tuesday that the spread of severe acute respiratory syndrome has been contained, but warned that China must remain vigilant to prevent a second outbreak of the highly infectious disease.

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With outbreaks in all the initial hot zones either contained or coming under control, severe acute respiratory syndrome is clearly in decline, the World Health Organization said Wednesday.

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