1. Sanofi and AstraZeneca's Phase IIIb HARMONIE trial demonstrates that nirsevimab reduces hospitalizations due to respiratory syncytial virus (RSV) by 83.21% and severe RSV-related lower respiratory tract disease (LRTD) by 75.71% in infants under 12 months.
4. Nirsevimab consistently demonstrated protection levels of around 80% against medically attended RSV infections across Phase III MELODY and Phase II/III MEDLEY trials and other Phase IIb data.
6. Pfizer's Phase III MATISSE trial demonstrates a vaccine efficacy rate of 66.7% against RSV-associated lower respiratory tract illness (LRTI) with two or more symptoms and 85.7% against severe LRTI.
9. GSK had to suspend three maternal trials due to safety concerns in February 2020, making Pfizer and Sanofi/AstraZeneca the frontrunners in the RSV vaccine race for kids.