Thank you in turn for your response, Michael.
It's likely that ZIKV infection will involve all countries in the Americas, apart from Canada and Chile ; indeed all countries where Aedes mosquitoes are found, including the Philippines, may be at risk of epidemic infections. It's unlikely a vaccine could be available for at least three years.
Obviously this is an evolving situation, but one which I judged worthwhile raising as a Forum topic. The Zika outbreak comes hard on the heels of the Ebola epidemic in West Africa, showing - again - how little-understood diseases can emerge as global threats.