Three different investigational Zika virus vaccine platforms--an inactivated virus vaccine, a DNA-based vaccine, and an adenovirus vector-based vaccine--protected against infection, induced immune responses, and produced no adverse side effects when tested in rhesus macaques challenged with the Zika virus, according to findings appearing August 4 in the journal Science. The results suggest that each of the three approaches holds promise for designing an effective Zika vaccine, according to the authors.
Researchers supported by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, first tested the inactivated Zika virus vaccine in 16 rhesus macaques, with eight receiving the experimental vaccine and eight receiving a placebo injection. Within two weeks after the initial injection, all vaccinated animals developed neutralizing antibodies as well as antibodies specific to the viral envelope protein, a key vaccine target on the Zika virus. A second dose was given four weeks later, which substantially boosted antibody levels. The monkeys were then challenged with Zika virus; following exposure, the vaccinated animals had no detectable virus and showed no other evidence of infection, while the group that received the placebo injection developed high levels of virus replication in the blood and other tissues for six to seven days.
In another experiment, the researchers administered two doses of an experimental DNA vaccine, one dose of an experimental adenovirus vector vaccine, or a placebo injection to three groups of four monkeys each. The group that received the DNA vaccine received a booster shot four weeks after the initial vaccination. Minimal levels of antibodies were detected after the first injection. However, after the second injection, researchers detected Zika-specific neutralizing antibodies in the animals. The adenovirus vector-based vaccine induced Zika-specific neutralizing antibodies two weeks after the single injection. Monkeys were exposed to Zika virus four weeks after the final vaccination, and both the DNA and adenovirus vector vaccine provided complete protection against infection. These encouraging findings suggest a path forward for clinical development of Zika vaccines in humans, according to the researchers.
Reference: Abbink P, et al. Protective efficacy of multiple platforms against Zika virus challenge in rhesus monkeys. Science DOI: 10.1126/science.aah6157 (2016).
Source: NIH/National Institute of Allergy and Infectious Diseases
A Helping Hand: Innovative Approaches to Expanding Hand Hygiene Programs in Acute Care Settings
July 9th 2025Who knew candy, UV lights, and a college kid in scrubs could double hand hygiene adherence? A Pennsylvania hospital’s creative shake-up of its infection prevention program shows that sometimes it takes more than soap to get hands clean—and keep them that way.
Broadening the Path: Diverse Educational Routes Into Infection Prevention Careers
July 4th 2025Once dominated by nurses, infection prevention now welcomes professionals from public health, lab science, and respiratory therapy—each bringing unique expertise that strengthens patient safety and IPC programs.
How Contaminated Is Your Stretcher? The Hidden Risks on Hospital Wheels
July 3rd 2025Despite routine disinfection, hospital surfaces, such as stretchers, remain reservoirs for harmful microbes, according to several recent studies. From high-touch areas to damaged mattresses and the effectiveness of antimicrobial coatings, researchers continue to uncover persistent risks in environmental hygiene, highlighting the critical need for innovative, continuous disinfection strategies in health care settings.