A team of health officials conducted raids at hotels and slaughterhouses in Kalamassery on Thursday. Sub-standard and expired food products were seized from 12 hotels in the area.
The hotel owners were served notices asking to ensure hygiene and report to the department within three days.
Meanwhile, a slaughterhouse was closed down for storing old meat products in freezer.
The raid was conducted at the municipal shopping market near Kalamassery Toll Junction.
According to health officials, the raid was carried out as directed by Kalamassery municipality chairman and chairperson of the health standing committee.
The officials seized rotten food products, including decayed vegetables and meat products. "We have seized stale chicken, rotten 'porattas' and 'appams'. The accused hoteliers used to mix decayed vegetables with fresh ones while cooking," said Ernakulam rural health officer P N Sreenivasan.
Most hotels had employed migrant labourers but many of them do not have the mandatory health cards.