**Endo Agar** is a specialized culture medium formulated for the selective isolation and differentiation of coliform bacteria, particularly in water, dairy, and food testing. Originally developed by Shigeru Endo, this medium is widely recognized for its effectiveness in microbiological analysis, especially in identifying lactose-fermenting bacteria.

The medium is characterized by its distinctive color-changing properties, where lactose fermenters such as Escherichia coli produce red to pink colonies with a metallic sheen, while non-lactose fermenters form colorless or pale colonies. This differentiation is crucial for accurate identification and analysis of coliform contamination in various samples.

Endo Agar is composed of peptones, lactose, dipotassium phosphate, sodium sulfite, and basic fuchsin, which collectively inhibit the growth of gram-positive bacteria while promoting the growth of gram-negative coliforms. Its robust formulation ensures reliable and reproducible results in quality control and routine microbiological testing.

Commonly used in public health laboratories, food and beverage testing facilities, and environmental monitoring, Endo Agar is an indispensable medium for ensuring the safety and quality of water, dairy, and food products. Its efficacy in detecting coliform bacteria makes it a trusted tool for microbiologists worldwide.