Microbiology Rideal – walker test is used to compare the efficiency of a disinfectant with that of phenol for the ability to kill A S typhi B S paratyphi C Pseudomonas D E.coli 💡 Explanation Rideal - walker test is used to compare the efficiency of a disinfectant with that of phenol for the ability to kill ✓ Correct Answer: A. S typhi