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By Zoë Roller, Contributing Reporter

RIO DE JANEIRO, BRAZIL – The approach of summer in Rio de Janeiro is known to bring an increased risk of dengue fever. Early 2011 remained dangerous, with 5,500 cases reported in Zona Sul (South Zone) alone, and now the Municipal Secretary of Health and Civil Defense is stepping up preventative campaigns to battle an epidemic in 2012.

The disease, spread by the Aedes aegypti mosquito, is caused by four distinct but related viruses. In moderate cases . . .

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