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Case 2

Stalled acidification in the cheese dairy

Case-based quiz on cheese: stalled acidification in the cheese dairy. 3 multiple-choice questions.

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A cheese dairy suddenly finds that the acidification in the cheese vat is slowing down and in some vats stops completely. Bacteriological analysis shows that bacteriophages are present. What is the most likely cause of the infection?

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All 3 questions in this quiz

A cheese dairy suddenly finds that the acidification in the cheese vat is slowing down and in some vats stops completely. Bacteriological analysis shows that bacteriophages are present. What is the most likely cause of the infection?
Which measure will be MOST effective in preventing future bacteriophage attacks in the cheese dairy?
Which disinfection method is EFFECTIVE at killing bacteriophages on surfaces in the cheese dairy?

Sources

The questions are based on the Danish textbooks below and translated from the Danish. Main source: Mejerilære 2. Page numbers in the quizzes are the books' own; “unknown” means the page could not be established. The full tests also refer to Mælkekemi and Tetra Pak's Dairy Processing Handbook.

Waagner Nielsen, E. & Ullum, J. A. (2003). Mejerilære 1. [Dairy technology, vol. 1: general.] 4th edition, 1st printing. Erhvervsskolernes Forlag, Odense. ISBN 87-7881-397-2.
Waagner Nielsen, E. & Ullum, J. A. (2004). Mejerilære 2. [Dairy technology, vol. 2: products.] 5th edition, 1st printing (1st edition 1986). Erhvervsskolernes Forlag, Odense. ISBN 87-7881-484-7. [main source]
Stein Jensen, P. & Nielsen, J. J. (2006). Mikrobiologi. [Microbiology.] 5th edition (3rd printing 2022). Praxis Forlag A/S, Copenhagen. ISBN 978-87-7881-662-7.
Waagner Nielsen, E. & Buch Kristensen, J. M. (2006). Mikrobiologi og bioteknik. [Microbiology and Biotechnology.] 2nd edition. Erhvervsskolernes Forlag, Odense. ISBN 978-87-7881-666-5.
Stein Jensen, P. (2003). Mejeriproduktion. [Dairy Production.] 3rd edition, 1st printing. Erhvervsskolernes Forlag, Odense. ISBN 87-7881-411-1.
Statens Forsøgsmejeri [Danish State Experimental Dairy] (1961). 128. beretning. [Report no. 128.] Hillerød.

Provided by Dairy Advanced Model Neuralset · @fiskce.

This is an unofficial teaching and study tool. The quiz content was written for educational use on the basis of the textbooks listed, and translated from the Danish. Copyright in the original texts belongs to their authors and publishers (Erhvervsskolernes Forlag, Praxis Forlag and others) and is not affected by this.

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