infect
verb(in-fect)
contaminate with a disease or microorganism
infect
verb(in-fect)
affect in a contagious way
Examples:
His laughter infects everyone who is in the same room. 
infect
verb(in-fect)
communicate a disease to
Examples:
Your children have infected you with this head cold. 
infect
verb(in-fect)
corrupt with ideas or an ideology
Examples:
Society was infected by racism.