June  2004

 

Soft (Unripened) Cheeses Require Care to Combat Listeria

Feeling crafty? Soft cheeses like neufchatel, cream cheese, and pizza cheese can be made at home.About 10 pounds of milk are needed to make one pound of soft cheese.

Specialized equipment is unnecessary but careful sanitation is essential. These cheese are very perishable, and require the use of pasteurized milk and scrupulous cleanliness. You will need a food thermometer which reads temperatures of 40oF to 125oF degrees, and a double boiler with a 5-quart capacity. Soft cheeses have a refrigerator life of 5 to 7 days. Complete
directions for making soft cheese can be obtained form the following web site:
http://www.ext.colostate.edu/pubs/foodnut/09337.html

Those interested in making cheese at home should be aware of health concerns. There have been reported outbreaks caused by Listeria bacteria in soft cheeses.

Most people do not get listeriosis. However, pregnant women and newborns, older adults, and people with weakened immune systems are at risk for becoming seriously ill from eating foods that contain Listeria monocytogenes. About 25% of the 1100 cases reported annually to Centers for Disease Control (CDC) die. Pregnant women risk miscarriage or serious health problems for the newborn.

High-risk individuals should not eat soft cheeses such as feta, Brie, Camembert, blue-veined or Mexican-style cheese. Instead, choose hard cheeses, processed cheeses, cream cheese, cottage cheese, and yogurt.

Listeriosis has flu-like symptoms, such as fever and chills. Sometimes people have an upset stomach, but not always. If the infection spreads to the nervous system, symptoms such as headache, stiff neck, confusion, loss of balance, or convulsions can occur.

It takes an average of 3 weeks for someone to become ill. If you are an at-risk individual and/or have symptoms that concern you, consult your physician. Listeriosis can be treated with antibiotics.

Because Listeria can grow at refrigeration temperatures of 40ºF or below, all consumers are advised to:
 

  • not drink raw, unpasteurized milk or eat foods made from it, such as unpasteurized cheese.

  • observe all expiration dates for perishable items that are precooked or ready-to-eat. Use as soon as possible.

  • clean their refrigerators regularly.

  • use a refrigerator thermometer to make sure that the refrigerator always stays at 40ºF or below.
     

 

Other June 2004 Articles:
   
Pack Sturdy Safe Snacks for Troops Overseas
    Apricots Add Delicate Flavor, Texture and Color to Meals
    Syrup For Canning or Freezing
    Apricot Jam without Added Pectin

 

Mary Schroepfer
schroepferm@missouri.edu.

Nutrition and Health
Education Specialist

 


Return to the St. Charles County main page.

University of Missouri Extension

stcharlesco@missouri.edu
Updated 04/02/07

Find a University of Missouri Extension Office