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Scientists are now saying the dangerous mosquito-borne Zika virus will spread across North America
WHO announcement comes amid viral outbreak possibly linked to birth defects in thousands of Latin American infants
Canadian Blood Services moves to ban blood donations from people who have traveled to affected areas
Cases reported in nearly two dozen countries in the Western Hemisphere, but experts say no need for alarm
Denmark, Switzerland latest countries to confirm infections among tourists returning from Latin America
Researchers say genetically modifying those mosquitoes may be the best way to get rid of them. Paul Brennan explains.