The concept was based on studies of simple organisms, particularly bacteria and viruses that infect bacteria.

Another approach being studied involves phages, viruses that infect and kill bacteria.

Some stretches of base pairs are ancient gifts left behind by infecting viruses and bacteria.

A basic element in the test is a phage, or virus that infects bacteria.

The labeled progeny were then allowed to infect unlabeled bacteria.

He also embarked on a major project, the study of viruses that infect bacteria.

Nineteen families are currently recognised that infect bacteria and archaea.

They put the genes into viruses and infect bacteria with the viruses.

Viruses that infect bacteria can sometimes pick up a gene from one bacterium and carry it to another.

The Plasmaviridae is a family of bacteriophages, viruses that infect bacteria.