immune system - a complex network of cells and proteins that defends the body against infection, side effects - a secondary, typically undesirable effect of a drug or medical treatment, immunologist - a person who treats health issues brought on by immune system problems, guinea pig - a small furry pet, lockdown - a state of isolation or restricted access instituted as a security measure, vaccine - a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prescient - having or showing knowledge of events before they take place., contagious - spread from one person or organism to another, typically by direct contact,

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