- NBC News
- by MAGGIE FOX
A batch of new studies show the Zika virus is trickier than it appeared at first glance, lurking for months in pregnant females and interfering with the immune system's response.
The findings help explain why the virus seems so mild in some people, yet causes devastating birth defects. And while the data suggests it is not going to be so easy to fight the epidemic, at least two studies offer some hope for a good, protective vaccine.