Eating out, poor hand hygiene and erratic weather may be among causes, say medics
Since then, the dead migrants' relatives have held small rallies in Pakistan's southern Sindh province but this was the first time they had taken their demonstration to the country's capital, vowing to stage a sit-in near the Indian Embassy.
The protesters accuse India's secret service of poisoning the 11 Hindus, who were found dead at a farmhouse in India's Jodhpur district in Rajasthan state. The demonstrators arrived in Islamabad around midnight, chanting, "We want justice."
They briefly skirmished with officers who prevented them from reaching the embassy site.
After the August 9 deaths, Indian media reports suggested the Hindu family members, originally from Pakistan, had taken their own lives. Official Islamabad says New Delhi had not shared any reports of the case.
Thursday's rally was an unusual move for Pakistan's Hindus, who have mostly lived without conflict with the country's Muslim majority.
Ramesh Kumar, a top leader of the Hindu community who led Thursday's protest, on Wednesday met with Foreign Minister Shah Mahmood Qureshi, seeking his help in pressuring India to release results of the initial police probe into the case.
Pakistan has also asked for access to a Hindu worker who was at the Jodhpur farm at the time of the deaths, according to government officials.
In his meeting with Qureshi, Kumar said Shrimati Mukhi, the daughter of the head of the family that died, had levelled the poisoning accusations.
She earlier this month told local media that India allegedly pressured the family to issue a statement denouncing Pakistan's government.
There was no official comment from India on the allegations.
Last week, Pakistan summoned an Indian diplomat to convey concerns over the "Jodhpur incident".
Nuclear armed rivals Pakistan and India have a history of bitter relations. Pakistan's military said on Wednesday that two of its soldiers were killed by Indian fire in a ceasefire violation in the disputed Himalayan region of Kashmir.
The region is split between the two countries but claimed by both in its entirety. India and Pakistan have fought two out of their three wars over Kashmir since gaining independence in 1947.
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