WHAT EXACTLY HAPPENED?
The first patients were admitted to hospital on Saturday in Eluru, a
town in Andhra Pradesh state.
By Sunday, according to the federal health ministry, there were more
than 200 people hospitalised, suffering dizziness, headache and
vomiting. Patients including children and women fainted, and that
evening a 45-year-old man died.
By Wednesday, the number of patients had jumped nearly three-fold.
As of Thursday, over 85% of the patients had been discharged.
The cause of their illness has yet to be identified. Tests ruled out
COVID-19 infection.
WHAT ARE THE POTENTIAL CAUSES?
Eluru is home to over 200,000 people, and is known for its weaving
industry.
Investigations have focused on whether the illness could be linked
to some groundwater contamination, excessive use of pesticides or
mass application of chlorine as part of a coronavirus disinfection
drive.
Doctors have also found traces of lead and nickel in the blood
samples of some patients. The elevated lead levels could have been a
trigger, especially as the levels appeared to drop among patients a
day after hospitalisation, doctors say.
The state government says officials are also checking if dumping or
burning of used batteries could have caused the illness, without
elaborating further.
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They are also testing the area's drinking water and milk samples.
A senior health official has also said exposure to organochlorides
found in pesticides and used in mosquito control could be a
potential cause.
WHAT ARE THE EFFECTS OF EXPOSURE TO LEAD OR CHLORINE
High levels of lead in the bloodstream can impair development of
brains, nervous systems and vital organs such as heart and lungs.
Organochlorides are banned or restricted in many countries after
research linked them to cancer and other health risks. It was not
immediately clear how extensively the chemicals are used in India,
though they are found in DDT used in mosquito control.
World Health Organization experts are surveying neighbourhoods in
and around Eluru, collecting various information, including on food
sources.
Health authorities are running various tests and the state's chief
minister has promised corrective measures once investigations are
completed.
(Reporting by Sudarshan Varadhan; Editing by Simon Cameron-Moore)
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