The missing reactant from this reaction is ________. 
Definitions:
Flu Virus
A contagious respiratory infection caused by influenza viruses, characterized by fever, cough, and muscle aches.
Animal Sources
Origins or suppliers of products, substances, or organisms derived from animals, such as food, fibers, or research models.
Intrude
To enter without permission or welcome, often causing disruption or disturbance.
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