Scientists develop kill switches to counter 'rogue' microbes
Harvard scientists have integrated kill switches into bio-engineered bacteria to terminate them when they are not wanted anymore. A "cryodeath" kill switch is activated as the temperature drops from 37ÂºC to 22ÂºC while another "essentializer" releases toxin genes when the microbe deviates from its target. Only one of 1,00,000 bacteria was found to function in mice after introducing the mechanism.