SCIENTISTS have discovered two deadly strains of salmonella that are almost impossible to treat after the bug mutated in Africa.
There are fears the bacteria could spread overseas, because researchers have yet to locate exactly where the bug is found and grows.
The discovery followed the first global-scale genetic study of the Salmonella Enteritidis bacteria, which is a major cause of blood poisoning and death in Africa, and food poisoning in the West.
The research found for the first time there are three separate strains of salmonella.
The study also showed that the two African types carried more of the genes that give them resistance to common antibiotics.
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