prevent spoilage prevent spread prevent spreading prevent stomach prevent stress prevent stroke prevent students prevent sudden prevent suicide prevent suicides prevent symptoms prevent tampering prevent tax prevent terrorism prevent terrorist prevent terrorist attacks prevent that from happening prevent the abuse prevent the accumulation prevent the appearance prevent the buildup prevent the collapse prevent the creation prevent the death prevent the destruction prevent the development prevent the disease prevent the effects prevent the emergence prevent the engine prevent the entry prevent the escape prevent the flu prevent the formation prevent the further prevent the growth prevent the inevitable prevent the infection prevent the introduction prevent the loss prevent the misuse prevent the movement prevent the need prevent the next prevent the occurrence prevent the onset prevent the passage prevent the possibility prevent the product prevent the production prevent the progression prevent the proliferation prevent the recurrence prevent the release prevent the return prevent the risk prevent the risks prevent the situation prevent the spread prevent the spread of disease prevent the spread of infection prevent the transmission prevent the use prevent the virus prevent the war prevent the water prevent the worst prevent theft prevent them prevent them from becoming prevent them from doing prevent them from getting prevent these problems prevent things prevent this from happening prevent this from occurring prevent this happening prevent this kind prevent this situation prevent tipping prevent tissue prevent too prevent tooth decay prevent torture prevent traffic prevent trafficking prevent transmission prevent type prevent unauthorised prevent unauthorised access prevent unauthorized prevent unauthorized access prevent unintended prevent unintentional prevent unnecessary prevent unpleasant prevent unwanted prevent up prevent urinary