Do you know about Zika virus news ? That like dengue and West Nile virus, this mosquito-spread disease is now going to be a regular fixture — and a perennial risk for pregnant women. The huge bloom of Zika activity in the Americas right now is unprecedented. A longtime US Army scientist who is now semiretired, Halstead believes Zika will vanish in a few years, likely for decades. That’s the way another arbovirus, chikungunya works, he wrote in an article in Emerging Infectious Diseases last year. “The rate at which people are getting infected right now certainly suggests that we’re heading, within a year or two, to achieve sufficient herd immunity for this virus to die out,