In both oral and faecal samples, people with migraines had slightly higher levels of bacteria linked to breaking down nitrates.
Beach closings, either from sewage overflows or high levels of bacteria in the water, have become something of an annual ritual.
Cutler screened banknotes and credit cards and found 26% of the notes and 47% of the cards had high levels of bacteria, including E coli.
If everything in the Fountain Valley plant is in perfect working order, its finished water will contain no detectable levels of bacteria, pharmaceuticals or agricultural and industrial chemicals.
The stools of these babies, Lynch added, had low levels of bacteria including Faecalibacterium and Bifidobacterium and high levels of fungi such as Candida and Rhodotorula.
"It is an absolutely abject situation in Calais, there are harmful levels of bacteria and the hygiene situation is appalling," he added.
But the scientists also found a north-south divide in the levels of bacteria found on phones, with northern cities the dirtiest.
The toilet, bathroom sink and items from the housekeeper's carts also had high levels of bacteria.
People with type 1, for example, had high levels of bacteria called Bacteroides.
The agency is also on the lookout for higher levels of bacteria and nutrients from sewer discharges.
The research showed that migraine sufferers had higher levels of bacteria that are known to be involved in processing nitrates, which are typically found in processed meats, leafy vegetables and some wines.
