Companies like Pfizer, Sanofi, Merck, AstraZeneca and MedImmune continue to disinfect with a safe SteraMist BIT chemical protecting their operator, facility and the environment, while providing the confidence to the American population that we will produce sterile vaccines.
Take context from the input text and decide on the accurate relationship between 'MedImmune' and 'AstraZeneca' from the options provided.
Options: platform, original broadcaster, manufacturer, parent organization