At least 20 workers, majority of them women, fell sick after a leak of ammonium gas late on Thursday night in a dairy belonging to a private agro products firm in Putalapattu constituency in Andhra Pradesh.
While three of the victims were shifted to Ruia Hospital in temple town of Tirupati, five were admitted to the CMC hospital in Vellore in neighbouring Tamil Nadu.
The others were undergoing treatment in the government hospital in Chittoor, police said.
Chittoor district Collector Narayana Bharat Gupta and Superintendent of Police