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MedImmune expands Frederick plant

FREDERICK — The biopharmaceutical company MedImmune is expanding its Frederick manufacturing plant.

Frederick city and county officials joined the company in celebrating the official opening Friday of a 337,000-square-foot addition.

The new space expands production capacity for products including Synagis, a drug that prevents a respiratory virus infection in high-risk children.

Gaithersburg-based MedImmune says it employs about 250 people in Frederick and expects to add more.

The company is a subsidiary of London-based AstraZeneca PLC.