Experimental Zika vaccine reveals T cells can drive protection without antibodies

Zika virus has been spreading for decades, but it first grabbed worldwide headlines in 2016. That February, with an outbreak sweeping the Americas, the World Health Organization (WHO) declared the surge in Zika-linked birth defects a "public health emergency of international concern"—a designation that lasted until that November. An estimated 1 million people or more were infected before the wave subsided.