HIV药效试验在过去几年招募了上千名试验参与者，尽管有最佳的指导，仍有一些参与者因为他们的危险行为感染了艾滋病。
HIV efficacy trials enroll thousands of participants over several years, and with even with the best counseling some participants will still become infected through their risky behavior.
有时候，消费者们需要采取一些自主行为来避免感染大肠杆菌和沙门氏菌这一类的食源性致病菌。
Sometimes the consumer has to take independent action to avoid food-borne pathogens such as E. coli and salmonella.
这类行为带来了人员接触和感染的高度风险。
These behaviours carry a high risk of human exposures and infections.
应用推荐