After, their blood will be analyzed to see the body response. During Phase II and Phase III trial, the prevention effect will be evaluated. Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at the National Institute of Health, explained that Phase I trial results “usually takes maybe four months or so to see if it is safe.” In fact, this is only the beginning. It will likely take years before a Zika vaccine can go through the necessary testing to be fully approved.
We know very little about how Zika replicates, how it causes disease, or how the immune system protects against infection.The estimated cost to develop a vaccine is US$160-500 million. The Public Health Agency of Canada, the Butantan Institute in Brazil and the US National Institutes of Health have started independent work on Zika vaccines.