accidental release of organisms(Genetically engineered organisms that are released in the environment by mistake; once released they may exhibit some previously unknown pathogenicity, might take over from some naturally occurring bacteria (possibly having other positive functions which thus are lost) or pass on some unwanted trait to such indigenous bacteria. There is also concern that an uncontrolled genetic mutation could produce a form with hazardous consequences for the environment)
accident source(The cause or origin of an unexpected occurrence, failure or loss with the potential for harming human life, property or the environment)