The 'mystery' illness has infected more than 300 children, with most of them suffering from dizziness, fainting spells, headaches and vomiting.
Indian authorities said on Tuesday they found traces of lead and nickel particles in blood samples after hundreds of people were hospitalised due to an unknown illness in Eluru town of West Godavari district in Andhra Pradesh.
Eluru, 58 km northeast of Vijayawada, headquarters of West Godavari district, is paddy cultivation and aquaculture heavyweight.
Teams of doctors, including those from New Delhi's premier All-India Institute of Medical Sciences (AIIMS), are investigating the death of one person and hospitalisation of more than 400 in the past few days.
Andhra Pradesh's state government said on Tuesday the AIIMS team had found traces of lead and nickel in their samples, while, the Indian Institute of Chemical Technology (IICT) is also running tests and the results are awaited.
The illness has infected more than 300 children, with most of them suffering from dizziness, fainting spells, headaches and vomiting. They have tested negative for COVID-19.
High levels of lead in the bloodstream can impair the development of brains, nervous systems and vital organs such as the heart and lungs.
Earlier on Tuesday, federal lawmaker GVL Narasimha Rao, who is from the state, said on Twitter that he had spoken with government medical experts and that the "most likely cause is poisonous organochlorine substances".
"It is one of the possibilities," said Geeta Prasadini, a public health director in Andhra Pradesh state, adding they were awaiting test reports to ascertain the cause.
She said no new serious cases have come to light in the past 24 hours. A 45-year-old man died over the weekend.
A special sanitation drive was undertaken in Eluru city and also in the adjoining rural pockets and Denduluru from where the cases were reported.
Organochlorines are banned or restricted in many countries after research linked them to cancer and other potential health risks. However, some of the pollutants remain in the environment for years and build up in animal and human body fat.
(With agency inputs)
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