Thursday, August 04, 2016

Scientists Tease Out Climate Change’s Role in Zika Spread

A truck sprays insecticide near grounds workers at Olympic media accommodations as part of preventative measures against the Zika virus and other mosquito-borne diseases in Rio de Janiero, Brazil. (Credit: Reuters/Chris Helgren) Click to Enlarge.
Athletes and tourists converging on Brazil this week are crowding into a country where rapid environmental change and natural weather fluctuations nurtured a viral epidemic that has gone global.

The Zika virus has exploded throughout South America, up through Mexico and Puerto Rico and into Florida, but the conditions it needed to fester in northern Brazil were rooted in urbanization and poverty.  The initial Brazilian outbreak appears to have been aided by a drought driven by El Niño, and by higher temperatures caused by longer-term weather cycles and by rising levels of greenhouse gas pollution.

This combination of human and natural forces is emerging as the possible incubator of a disease that’s painfully elusive to detect, despite its cruel effects on unborn children.

The U.S. Centers for Disease Control and Prevention issued an unprecedented domestic travel advisory this week, warning pregnant women to avoid a Miami neighborhood where more than a dozen Zika cases were confirmed.

The warning came six months after the World Health Organization declared a public health emergency “of international concern” in Brazil, where the opening ceremony for the Summer Olympics is scheduled for Friday.

Most Zika infections produce no symptoms, turning their hosts into unwitting harbors for the disease, which is mainly spread through mosquito bites.  Unborn children risk microcephaly when their mothers are infected, meaning their heads are small — the result of unusual brain development.

Read more at Scientists Tease Out Climate Change’s Role in Zika Spread

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