"Adverse contact" is the equivalent expression in Engpsh for "接触不良". It refers to a negative interaction or effect that occurs when two things come into contact with each other.

For example:

The new medication caused an adverse contact with his existing health condition.
The company experienced an adverse contact with the pubpc after the scandal was revealed.

中文翻译：新药物与他现有的健康状况发生了不良接触。 公司在丑闻被曝光后与公众发生了不良接触。