Today the World Health Organization's (WHO's) weekly Zika update included a series of Zika "firsts" in several countries, including the first Zika-related birth defects reported in Guatemala.
Also, the CDC released new Zika numbers for the United States, while human trials of a vaccine are set to begin in Brazil.
More Zika spread in Caribbean, Asia
According to the WHO's weekly Zika situation report, the two-island nation of St. Kitts and Nevis is now experiencing Zika transmission, bringing the number of countries or territories with Zika virus to 73.
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