Moderna shares slide as longer-term data shows quick fall in RSV vaccine efficacy By Reuters



© Reuters. FILE PHOTO: Moderna logo is seen displayed in this illustration taken, May 3, 2022. REUTERS/Dado Ruvic/Illustration/File Photo

(Reuters) – Moderna (NASDAQ:) shares fell 6% on Friday after a longer-term analysis of a trial indicated a quicker fall in the efficacy of its experimental respiratory syncytial virus (RSV) vaccine.

At least two analysts pointed to the data, posted ahead of a conference on RSV next week, that showed a vaccine efficacy of about 63% after 8.6 months, from 84% at 3.3 months.

Pfizer (NYSE:)’s vaccine efficacy went from 67% to 49% in 17 months, while GSK’s fell to 77% at 14 months from 83%, TD Cowen analyst Tyler Van Buren said.

The data suggests Moderna’s RSV vaccine efficacy is “declining quicker than the GSK and Pfizer vaccines,” he said.

Moderna’s shares were at $88 in morning trading, and were on track for their biggest one-day fall since November.



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