Needle-free flu vaccine patch works as well as a shot

A press-on patch that delivers flu vaccine painlessly worked as well as an old-fashioned flu shot with no serious side effects, researchers reported Tuesday.

People who tried out the patch said it was not difficult or painful to use, and tests of their blood suggested the vaccine it delivers created about the same immune response as a regular flu shot, the team reported in the Lancet Medical Journal.

The hope is the vaccine will be cheaper, easier to administer and more acceptable than a regular flu vaccine.

“It was really simple. It’s kind of like a bandaid almost,” said Daisy Bourassa, a college instructor who tested the new vaccine for the study.

“It’s not like a shot at all. If I had to describe it, it is maybe like pressing down on the hard side of Velcro. It is like a bunch of little teeny tiny stick things that you can feel but it’s not painful.”

The team at Georgia Tech, and a spin-off company called Micron Biomedical, have been working on the patch vaccine for years. This was the first test using real flu vaccine, and the results show it caused immune responses very similar to those elicited by vaccine administered by syringe.

“There were no treatment-related serious adverse events,” Dr. Nadine Rouphael of the Emory University School of Medicine and colleagues wrote in their report.

It was a phase one trial, meant mostly to show safety in just 100 volunteers. That’s not enough to show whether the vaccine actually prevented any cases of influenza. That will take a larger trial to demonstrate.

“The results were great,” Rouphael told NBC News. “We were pleased to see that the immune response was excellent.”

The tiny needle-like points on the patch are made out of the vaccine itself. When pressed into the skin, the needles dissolve, delivering the dried vaccine into the outer layer of the skin. This layer is loaded with immune system cells that are the first line of defense against invaders such as bacteria and viruses. These cells take up the vaccine and use it to prime themselves against a flu infection.

The trial showed that people could use the patch without any help and liked it. It also showed they had an immune response to the patch, and did not have any serious side-effects from using it.

If it continues to work well in tests, Rouphael said it might be possible to just let people buy the vaccine patches and take them home to use. They’ll be much easier to ship around the country and the world than current vaccines, which must be carefully refrigerated.

“I think it would be fantastic if this was something you could get and administer yourself at home,” she said. “The reason why many years I don’t get a shot is that I don’t have time to wait in a line or whatever. It would be really awesome if I could order it and it would be delivered like Amazon Prime.”

Biomolecular engineering professor Mark Prausnitz of Georgia Tech, who leads the team developing the patch vaccines, said the vaccine stayed stable for as long as a year at temperatures up to 100 degrees F. Conditions like that would completely spoil a regular flu vaccine.

Prausnitz and colleagues are trying other vaccines in their device, including Measles, Rubella and Polio vaccines. He says he has even tried experimental Ebola and Zika viruses in the delivery patch.

“We haven’t yet met a vaccine we haven’t been able to incorporate into a microneedle device,” Prausnitz said. Other possibilities for the microneedle delivery system are drugs that must be injected, as well as insulin, he said.

“Microneedle patches have the potential to become ideal candidates for vaccination programs, not only in poorly resourced settings, but also for individuals who currently prefer not to get vaccinated. It potentially could even being an attractive vaccine for the pediatric population,” they wrote in a commentary in the Lancet.

NBC News