Phages are parasites of bacteria, and the phage that Sequella works with specialises in M. tuberculosis.

ECONOMIST: A poor diagnosis

Dr Martha Clokie says we may see the use of phage therapy outside the former Soviet Union in the next decade.

BBC: Phages may be key in bacteria battle

The National Public Health Service for Wales (NPHS) said all four cases in Wrexham were confirmed as E.coli O157 phage type 2.

BBC: Four E.coli cases linked by tests

F-Secure also offers protection against the Palm OS Phage.963 virus and the Palm Liberty Trojan, both of which have come to the public's attention.

CNN: Company scans for viruses targeting PDAs, WAP devices

Genetic engineers have, however, tinkered with the phage, and have arranged for it to produce a fluorescent protein called luciferase when it infects a bacterium.

ECONOMIST: A poor diagnosis

The institute also has some prepared phage solutions that it has worked out will kill the bacteria that cause common diseases, such as E.coli, which causes stomach upsets.

BBC: Phages may be key in bacteria battle