“The difficulties with flu vaccines include needing to update them every year because the flu virus changes, certain parts of the virus making the vaccine less effective, and not being able to protect against all types of the flu virus. It’s also hard to make sure everyone can get the vaccine. But getting the flu shot can help reduce how many people get sick, help protect those who can’t get the shot, and maybe one day there will be a vaccine that works for all types of the flu. Making the immune system respond better to the flu shot could also help protect against more types of the flu.”
Is it possible to create a long lasting, universal flu vaccine?
The researchers of the current study note that annual flu vaccines help create antibodies that target specific areas of HA globular head. However, this region often experiences frequent mutation.
Thus, if they could figure out a way to target an area of the HA that doesn’t change as much, the stalk, they may be able to create a vaccine that could protect against many flu strains. However, while this has been tried in the past, it has not been effective in also eliciting an effective response in the head region.
Thus, researchers wanted to create a vaccine that could produce head and stalk-directed antibodies to offer long-term immunity against multiple flu strains. Ultimately, they made an HA antigenic mixture–based vaccine. This vaccine contained a mixture of HA proteins with a conserved stalk region and various mutations at a key site in the head.
Researchers in this study tested the vaccine’s effectiveness on mice and ferrets. They compared the response to conventional vaccine approaches.
They found that their vaccine elicited a better antibody response than the control vaccine option. The vaccine even offered protection when mice were exposed to lethal viral doses. It also offered protection against multiple H1 viral strains.
However, this newly developed vaccine appears most effective after receiving an initial prime dose and a booster rather than just a single dose.
Non-study author Linda Yancey, MD, Infectious Disease Specialist, Memorial Hermann Health System in Houston, commented with her thoughts on the study to MNT:
“This is a nice step in the direction of a universal flu vaccine. Producing one has been the goal of researchers for years. It has proven to be a complex and difficult task, so it is nice to see solid progress being made towards it. At this time scientists are still working on developing the building blocks of a vaccine. We probably won’t see any changes in clinical practice based on this for a few years. But every step in the right direction brings that universal vaccine a little closer.”
Study limitations and continued research
This study has limitations, mainly because animal testing differs from testing something in people. These animals had also not experienced any previous flu vaccine or flu exposure, which could have affected the observed results. Researchers note that most people have some pre-existing immunity to influenza, which could minimize or influence the response to this type of vaccine. The study also only looked at one H1 HA, so it’s unclear how the approach would impact other HAs. In addition, not all animal experiments were conducted in a blinded manner.
Researchers also acknowledge that further study is required to understand more of the underlying mechanisms and confirm why they observed the response they did. They acknowledge that “the protection from infection may not always be correlated with decreasing classical antigenic site-directed responses.”
Even if this potential vaccine is developed, experts, government agencies, and health professionals will need to address distribution and acceptance. Non-study author David Cutler, MD, board certified family medicine physician at Providence Saint John’s Health Center in Santa Monica, CA, noted the following:
“While safety and effectiveness are the major concerns, vaccine uptake is also an important issue to consider. Presently, only about 50%Trusted Source of adults receive a flu vaccine. Any improvement in effectiveness could be offset be reluctance to receive a new vaccine. It is the role of our public health agencies to convince people that the benefits of approved vaccines greatly exceed their risks. So, while scientists may develop new, improved vaccines the benefit to society may not be realized if the vaccines do not get administered.”
However, the research sets up the potential development of a long-term flu vaccine. This could make it easier to maximize the vaccine’s impact and ultimately minimize the detrimental health effects of the flu.
Quinones was hopeful about the results and noted the following:
“The new flu vaccine might work better than the old ones. If it works in people like it did in animals, it could mean fewer people getting sick from the flu each year. It might also lead to a vaccine that works for all types of the flu, which would be a big deal for keeping people healthy.”
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