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