158. A probiotic is a live microorganism that is claimed to confer a health benefit by altering the
indigenous microflora of the intestinal tract. Which one of the following bacteria has been used
widely in probiotics?
A. Klebseilla pneumonie
B. Pseudomonas putida
C. Lactobacillus lactis
D. Escherichia coli

What is a Probiotic?

A probiotic is a live microorganism that, when administered in adequate amounts, provides a health benefit to the host. Probiotics are often referred to as “good bacteria” because they support the intestinal microbiome, contributing to digestion, immunity, and overall gut health.

Probiotics are typically bacteria that are incorporated into the diet or taken as supplements. The most common species used in probiotics are lactic acid bacteria, which include the genus Lactobacillus.

Which Bacteria is Widely Used in Probiotics?

The correct answer is:

C. Lactobacillus lactis

Lactobacillus species, including Lactobacillus lactis, are widely recognized for their beneficial effects in maintaining a balanced gut flora. These bacteria are often found in fermented foods like yogurt, kefir, and other dairy products. They help in maintaining a healthy balance of gut bacteria, improving digestion, and enhancing immune function.

Why is Lactobacillus Important for Probiotics?

Lactobacillus bacteria are well-suited to survive and thrive in the human gastrointestinal tract. They are acid-tolerant, which allows them to endure the acidic conditions of the stomach and reach the intestines, where they perform their beneficial functions. Some of the key health benefits attributed to Lactobacillus and other probiotics include:

• Supporting Digestive Health: Probiotics help break down food in the gut, improving nutrient absorption and preventing constipation.

• Boosting Immunity: By promoting a healthy balance of intestinal flora, probiotics help the body fend off harmful pathogens and maintain immune function.

• Restoring Gut Flora After Antibiotic Use: Antibiotics can disturb the natural balance of bacteria in the gut. Probiotics, such as Lactobacillus, can help restore this balance.

Other Bacteria in Probiotics

While Lactobacillus is widely used in probiotics, other bacteria can also be beneficial, including:

• Bifidobacterium: Often found alongside Lactobacillus in probiotics, Bifidobacterium helps maintain a healthy intestinal flora.

• Escherichia coli: Although some strains of E. coli are harmful, certain non-pathogenic strains have been used as probiotics, particularly for promoting gut health in infants.

• Streptococcus thermophilus: Commonly used in dairy products, this bacterium works synergistically with Lactobacillus to produce lactic acid, which aids in digestion.

Conclusion

Among the options provided, Lactobacillus lactis is the correct answer as the most widely used bacterium in probiotics. These beneficial microorganisms play an essential role in maintaining digestive health and overall well-being.