Nirsevimab is a preventive medication designed to protect infants against respiratory syncytial virus (RSV) infection. It’s a long-acting antibody that helps the immune system fight against RSV. It can be given to infants either seasonally or at around 4 months of age.

Abrysvo is a vaccine given to pregnant women to help protect their unborn babies against RSV. It works by helping the mother’s body create antibodies that can be passed to the baby before birth. The vaccine is administered during pregnancy between 32 and 36 weeks of gestation.

Respiratory syncytial virus infection – A common viral infection that affects the respiratory tract, particularly in young children and infants. The virus causes inflammation and swelling of the small airways in the lungs. It typically starts with cold-like symptoms including runny nose and cough, which may progress to affect breathing. The infection often occurs seasonally and can spread easily through close contact.

Bronchiolitis – An inflammatory respiratory condition that affects the smallest air passages in the lungs called bronchioles. It causes swelling and mucus buildup in these tiny airways, making breathing difficult. The condition most commonly affects young children and infants. Symptoms typically begin with those similar to a common cold, such as congestion and cough, and may progress to rapid breathing and wheezing.

Respiratory tract infection – An infection that affects the respiratory system, which can involve the upper or lower airways or both. These infections can be caused by various viruses or bacteria affecting the nose, throat, sinuses, airways, or lungs. Common symptoms include cough, congestion, sore throat, and breathing changes. The infection may be accompanied by fever and general discomfort.