These diseases, ranging from dengue fever and malaria to West Nile virus and yellow fever, are the cause of millions of deaths worldwide, yet control methods have become a dilemma due to the development of resistance by mosquitoes and increased concern about health and environmental hazards.

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However, the development of reproducible methods to control stem cell growth and differentiation is still a challenge and major studies are needed before stem cells can be widely used for therapeutic purposes.

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In six cases, it was possible to compare the effect of the new methods with a control area, where levels of disorder and police resources were similar.

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Currently, the methods used to assess an infection by America's Centres for Disease Control and Prevention lag an outbreak by a week or two.

ECONOMIST: Epidemiology: Infectious personalities | The