To slow its spread, such measures as the closure of schools and the prohibition of large social gatherings might need to be contemplated.

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In addition, over a dozen specific changes are being made to the design of the battery and its charger, such as adding more insulation to prevent the spread of overheating from one cell to another.

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Melanoma, because of its tendency to spread if left too long, may require extra treatment such as chemotherapy.

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Although its natural habitat is broadleafed or mixed forests, it can spread quickly through managed landscapes such as pastures, rail embankments and river banks.

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This is a big move for Zynga, as the growing social games maker has been attempting to spread beyond Facebook, first with the launch of standalone sites for its herd of games such as FarmVille.com, and now this.

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