2N-SING [oft NOUNof n](不良思想、态度、感情等的)传播,蔓延 You can use contagion to refer to the spreading of ideas, or attitudes, or feelings that you consider to be bad or unacceptable from one group of people to another. (不良思想、态度、感情等的)传播,蔓延 [disapproval]
He continues to insulate his country from the contagion of foreign ideas.