Attacking respiratory syncytial virus (RSV) on 3 fronts: Monoclonal antibodies for infants, vaccines for pregnant women and elderly

By Dr. Ilhem Messaoudi
University of Kentucky

After an intense season of respiratory syncytial virus in the commonwealth, we have a new tool to protect children from RSV.

In July 2023, the U.S. Food and Drug Administration approved AstraZeneca’s Beyfortus (nirsevimab-alip) for the prevention of RSV lower respiratory tract disease in neonates and infants born during or entering their first RSV season. It’s also for children up to 24 months of age who remain vulnerable to severe RSV disease through their second RSV season.

RSV is a common respiratory virus that usually causes mild, cold-like symptoms. Most people recover in a week or two, but the virus can be serious, especially for infants and older adults.

Dr. Ilhem Messaoudi on KET's "Kentucky Tonight"

This is not a vaccine for children, but a monoclonal antibody treatment, much like what we saw developed to fight Covid-19 in the early days of the pandemic. The treatment is giving these young immune systems a bunch of antibodies against RSV and helping them fight it off.

The science behind this development is exciting. These types of viruses have been very challenging to make vaccines against, and now we have a great therapy.

To me, as a parent, virologist and immunologist, I see very few downsides of giving Beyfortus to young infants who atre at risk from severe RSV. Anything we can do to protect the smallest, most vulnerable Kentuckians is a step we should take. Because if a child is hospitalized with RSV the only thing we can offer them is supportive care.

RSV protections for pregnant women, elderly adults

Also exciting are the protections we now have for other vulnerable populations: pregnant women and the elderly.

Recently, federal health advisers have shown support of Pfizer’s first-of-its-kind RSV vaccine for pregnant women to protect infants in the first few months of life through the passive transfer of maternal antibodies. This strategy is already used to protect neonates and young infants against pertussis, flu and covid passed using antibodies passed from mom to baby during pregnancy through the placenta and after birth via breastfeeding.

And, back in May, the FDA approved the first-ever vaccine against RSV for older adults from GSK called Arexvy.

It’s amazing that in one year we have a monoclonal antibody treatment for infants and not only one but two different vaccines for pregnant women and older adults.

We now have more tools at our disposal to prevent people of all ages from ending up in the ICU and dying, and it all starts with getting your vaccines and staying up to date on them.

Anyone with questions about treatments for themselves or their children should talk to their primary health-care provider.