Beyfortus: how long were the pivotal tox studies?

“Dose and frequency of dosing Weekly for 4 weeks (5 injections total)”

“In the 4-week toxicity study with a 25-week recovery period once weekly i.v. or i.m. administration (5 doses total) of nirsevimab of 0, 300 mg/kg/week i.v. or 0 and 300 mg/kg/week i.m (6 monkeys/sex/group) or 50 mg/kg/week i.v.”

“Route of administration Either intravenous or intramuscular”