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Glam Journal

Is blue cheese mold or bacteria?

Author

Matthew Shields

Updated on March 29, 2026

Is blue cheese mold or bacteria?

Blue cheese is made using Penicillium, a type of mold that’s responsible for its unique taste, smell, and appearance. Unlike other types of mold, Penicillium does not produce toxins and is safe to consume.

Why are microorganisms used in blue cheese?

These bacteria produce an open-textured curd through the production of CO2 from citrate, which helps the development of P. roqueforti. The cheeses also contain thermophilic starters including Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus).

What microbes are used in cheese?

Thermophilic species such as Streptococcus thermophiles, Lactobacillus helveticus, and Lactobacillus delbrueckii ssp. are associated with Swiss- and Italian-type cheeses. Bacterial species can also be classified as mesophilic because these microorganisms ferment lactose only at 105°F or less.

Does blue cheese have good bacteria?

The cheeses that contain signifcant good bacteria are Gouda, mozzarella, cheddar and cottage cheese, and some blue cheese such as Roquefort. And feta is rich in Lactobacillus plantarum bacteria, which produces anti-inflammatory compounds.

Can blue cheese get moldy?

The mold on blue cheese is from the same family of spores used to make Penicillin. With most foods, spotting gray veins with specks of blue mold accompanied by a quick whiff of ammonia means it’s time to throw whatever it once was in the trash. Yes, many varieties of blue cheese are made with mold.

Why is blue cheese expensive?

Though blue cheese can come in many shapes and forms, most kinds of blue cheese are aged for 1-6 months, have a fat content of 28-34% per 3.5 oz, and a relatively high level of moisture that promotes mold growth. It’s also one of the most expensive cheese varieties carried by grocery stores.

Is blue cheese good for your immune system?

With an abundance of nutrients like vitamins A and D, potassium, sodium, and zinc, blue cheese helps in strengthening the immune system and therefore alleviating the risk of succumbing to various infections and diseases.

Does all blue cheese contain penicillin?

The antibiotic penicillin is made from the fungus Penicillium chrysogenum. Stilton and most other blue cheeses do use Penicillium mould to create the blue veins, but they use a different strain (P. roqueforti) and the whole mould, rather than the penicillin extract.

What kind of bacteria is in blue cheese?

Consuming a varied diet is ideal for your health. Bifidobacteria and lactic acid bacteria are always present in blue cheese, although certain strains may not be included depending on the manufacturer.

Where do the microbes in cheese get their name?

These are the microbes (bacteria) that are added to the milk very early in the cheese making process that induce the fermentation process. The main reaction taking place here is the conversion of lactose to lactic acid, acidifying the milk, which explains how they get their name.

What kind of mould is blue cheese made of?

Making a blue cheese in the modern day – how to make a blue cheese ‘blue’! Scie ntists continue to develop and grow different strains of Penicillium roqueforti (and other moulds and bacteria) in their labs to produce specific flavours.

Are there any lactic acid probiotics in blue cheese?

Although hundreds of lactic acid probiotics exist, the most beneficial appear to be the lactobacillus group, also present in blue cheese.

Which probiotic bacteria does blue cheese have?

Bifidobacteria are also well-recognized probiotics appearing in the majority of dairy products, including blue cheese. Lactic-acid bacteria and bifidobacteria typically work in conjunction with one another.

How is bleu cheese made?

Bleu cheese is made from goat, sheep or cow milk and uses the mold Penicillium glaucum. Gorgonzola is made of un-skimmed goat or cow milk and uses the same mold. Bleu cheese is injected with the mold during production and is allowed to age for many months in an environmentally controlled setting.

What is bleu cheese?

The definition of bleu cheese is the French spelling for blue cheese, a semisoft cheese. An example of bleu cheese is a strong flavored cheese with blue mold running through it.