Public Health England has been "making good progress" in its investigation into a national outbreak of Salmonella Enteritidis, the doctor leading the probe has said.
Consultant epidemiologist Dr Paul Cleary said they "hope to have more conclusive evidence shortly."
“We will continue to monitor the situation and if there is any further public health action necessary then we will ensure that this takes place,” he added.
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The Labour leader said newspapers were going "a little bit James Bond" over the "increasingly wild and entirely false" claims.
The "astonishing" find was made during an excavation at Vindolanda, near Hexham in Northumberland.