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.
In the context of the input sentence, determine the relationship between 'MedImmune' and 'AstraZeneca'.
Options: parent organization, manufacturer, platform, original broadcaster