Experts gathered last week at a Johns Hopkins Bloomberg School of Public Health symposium to address the Zika virus, explore emerging evidence, and evaluate the public health response. Presenters focused in particular onevidence that Zika virus is linked to birth defects, a connection supported by strong anecdotal evidence. But a number of questions remain about the nature of the virus, how it spreads, and how to quell the current outbreak.

Below is a closer look at some of what the experts had to say last week.

How fast can we develop an effective vaccine?

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