* Regulators probing possible safety lapses during transfer of propylene glycol to cough syrup maker

* Supplier told Reuters it had delivered the chemical to drugmaker Sresan in unsealed containers

* Sresan's factory not inspected since 2023 despite past violations - sources

By Krishna N. Das, Rishika Sadam and Praveen Paramasivam CHENNAI, Nov 21 (Reuters) -

Indian officials are investigating whether safety lapses in the supply of a pharmaceutical ingredient were responsible for contaminating cough syrup that has killed at least 24 children in recent months, according to three people familiar with the matter. The three health and drug safety officials from Tamil Nadu state told Reuters they believe the solvent used to make a batch of Coldrif cough syrup could have been contaminated wit

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