(Reuters) - Drug developer Inovio Pharmaceuticals Inc
The company's shares rose 11.1 percent to $7.30 in premarket trading on Wednesday.
Zika, whose symptoms include mild fever and rash, has been linked to brain damage in thousands of babies in Brazil.
There is no proven vaccine or treatment for the Zika virus, a close cousin of the viruses that cause dengue and chikungunya.
Inovio said on Wednesday that mice given its vaccine showed development of antibodies and generated response from T-cells, which play an important role in immunizing the body.
An estimated 80 percent of people infected have no symptoms, making it difficult for pregnant women to know whether they have been infected.
Inovio said it was developing the vaccine with GeneOne Life Sciences Inc <011000.KS> and academic collaborators.
(Reporting by Amrutha Penumudi in Bengaluru; Editing by Kirti Pandey)
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