名词
中文翻译：回感染
同义词：
['recurrent infection', "recurring infection例句：1. The patient's condition worsened after the retroinfection treatment.（患者在治疗后病情恶化。）"]
例句：
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1. The patient's condition worsened after the retroinfection treatment.
患者在治疗后病情恶化。
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2. Doctors have been studying the causes of retroinfection for years.
多年来，医生一直在研究回感染的原因。
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3. Researchers found that certain viruses can cause retroinfection in humans.
研究人员发现某些病毒可以在人类中引起回感染。