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The outbreak in Pune is being traced to a pathogen called campylobacter jejuni, a leading cause of foodborne infections, and the biggest driver of GBS worldwide.

Their findings showed that over a third of them tested positive for campylobacter.

Two-thirds of the cases were linked to campylobacter.

In countries with good hygiene, fewer GBS cases are linked to campylobacter, with respiratory infections being a major contributor, say experts.

"Campylobacter is endemic with hundreds of thousands of cases taking place all the time. It is always existing in the environment," Hugh Willison, a professor of neurology at University of Glasgow told me.