Coliform Findings at an Amritsar Dairy Sweet Shop
A dairy sweet shop in Amritsar sells kheer, rasgulla and paneer from a single counter. After two complaints of loose stools, the owner sends samples to a lab. Results: kheer 460 CFU/g coliform, hand swab from a food handler 2.4 × 10^3 CFU, cutting board 180 CFU/cm², and stored water 12 MPN/100 mL. Milk arrives at 29 °C in open cans from a nearby dairy and is transferred with a jug. The same cotton cloth wipes tables, knives and the kheer vessel. The sanitizer drum is empty, and the shop has no fly screen; the back door opens onto a drain. Staff wash hands in a bucket and dry them on a shared towel. The owner says the shop has been 'clean for 20 years' and blames the milk supplier. He wants to know what to fix first before the food safety officer visits next week.
1. Interpret the four laboratory results and decide the most likely contamination route for the kheer. Which finding should be treated as the priority, and why?
Read the worked answer
Coliforms are indicators of faecal or environmental contamination and poor hygiene, not proof of a single pathogen. The hand swab at 2.4 × 10^3 CFU is the highest count and directly links a food handler to contamination. The kheer at 460 CFU/g shows the product was contaminated after cooking or was held under conditions that allowed growth. The cutting board at 180 CFU/cm² and water at 12 MPN/100 mL show broader hygiene failures. The most likely route is hands or the shared cloth touching the kheer vessel after cooking, with inadequate handwashing and no sanitizer. The priority is hand hygiene and separation of clean and dirty tasks, because the hand count is high and hands contact ready-to-eat kheer directly. The water and board must also be corrected, but starting with handwashing, a clean hand-drying method and a working sanitizer gives the fastest risk reduction before the inspection.
2. Propose a corrective action plan covering cleaning, personnel, water and pest control. Explain the order in which the actions should be implemented.
Read the worked answer
Immediate actions: stop using the shared cloth for tables, knives and the kheer vessel; provide soap, running water and disposable towels or a hot-air dryer; prepare sanitizer at the correct strength and train staff to wash hands after handling money, waste or raw milk. Clean and sanitize the cutting board, jug and counter, then keep raw and ready-to-eat areas separate. Water: test the stored water again, clean the tank, and use a safe potable source or boil/cool water for food contact until the supply is verified. Pest control: fit fly screens, keep the back door closed, cover kheer, and clear the drain. Order: hand hygiene and separation first because they affect ready-to-eat food directly; cleaning and sanitizing second; water and pest control within the week. Record each action and re-swab hands and surfaces after training, otherwise the same counts will return.
3. The owner argues that the milk supplier is responsible because the milk arrives warm in open cans. How should the shop respond, and what milk-receiving controls should be introduced?
Read the worked answer
The warm, open milk is a real risk, but it does not explain the high hand swab or the board count. Responsibility is shared: the supplier must deliver milk at a safe temperature in covered containers, and the shop must reject milk that is warm, smells sour or is not protected. Introduce receiving checks: measure temperature at receipt and record it; reject open, dirty or leaking cans; transfer milk promptly into cleaned, covered vessels; do not leave it at 29 °C on the counter. If the shop further cooks the milk, the cooking step can reduce contamination, but post-cooking handling must still be protected. The owner should give the supplier written specifications and keep a sample of each delivery. This turns the blame into a verifiable control point and gives the food safety officer evidence that the shop checks what it receives, not just what it sells.