Virus-like (image) Arizona State University Share Print E-Mail Caption Chen's protein-based vaccine uses the smallest and most unique part of the Zika virus that can still elicit a potent and robust immune response. 'In our approach, we make what we call a pseudovirus. It's a fake virus. The pseudovirus displays only the DIII part of the envelope protein on the surface. This is at least as potent as previous vaccine versions.' Credit Biodesign Institute, Arizona State University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.