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Veterinary Medicine and Infectious Diseases · Journal article
Antibiotics · August 30, 2026
Raises a question worth testing. It does not answer one.
This is an in vitro laboratory study demonstrating that cinnamon essential oil inhibits E. coli strains isolated from rabbits with colibacillosis at concentrations (MIC50 0.5 μL/mL, MIC90 0.6 μL/mL) that inhibit 64.5% and 94.3% of strains respectively. The work is mechanistic and exploratory; no animal model, clinical trial, or in vivo efficacy data are presented to support the proposed prevention strategy.
In vitro susceptibility testing study. E. coli strains isolated from rabbits that died of colibacillosis in 10 industrial farms.. Intervention: Cinnamon essential oil (Cinnamomum zeylanicum), 100% pure commercial product, at concentrations 0.2–0.8 μL/mL.. n = 124. Ten industrial rabbit farms; country not specified..
MIC50 = 0.5 μL/mL inhibited 64.5% of 124 E. coli strains MIC90 = 0.6 μL/mL inhibited 94.3% of strains Strains exposed to 0.4 μL/mL were 12.9 times more likely to be inhibited than those at 0.3 μL/mL (p = 0.0001)
Feasibility and safety of achieving MIC90 concentration in rabbit feed or water not addressed.
This study provides no evidence of clinical benefit in rabbits. Before recommending cinnamon essential oil for colibacillosis prevention on farms, controlled in vivo trials measuring disease incidence and animal health outcomes are required.
In vitro antimicrobial susceptibility testing of bacterial isolates; no animal efficacy, clinical outcome, or in vivo validation reported.
As stated by the source record.
Quoted from the source exactly as published.
This study provides no evidence of clinical benefit in rabbits. Before recommending cinnamon essential oil for colibacillosis prevention on farms, controlled in vivo trials measuring disease incidence and animal health outcomes are required.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background/Objectives: Colibacillosis, caused by enteropathogenic strains of Escherichia coli (EPEC), is one of the most common infectious diseases in rabbit farms. In the past, antimicrobials were widely used to control colibacillosis, but their use in prevention is currently prohibited. Therefore, the adoption of new prevention strategies as alternatives to the use of antibiotics is very important. The aim of this study was to evaluate the antimicrobial efficacy of cinnamon essential oil (Cinnamomum zeylanicum) against EPEC strains responsible for colibacillosis in rabbits. Methods: For the experiment, 124 strains of E. coli isolated from rabbits that had died of colibacillosis in 10 industrial farms were used. Suspensions of each strain prepared according to CLSI standards with a bacterial density of 1 × 108 CFU/mL were tested using 100% pure commercial cinnamon essential oil (CEO) at concentrations ranging from 0.2 to 0.8 μL/mL. Minimum inhibitory concentrations MIC50 and MIC90 were determined according to a protocol described previously. Results: MIC50 and MIC90 were 0.5 μL/mL and 0.6 μL/mL, inhibiting 64.5% and 94.3% of strains, respectively. Furthermore, strains exposed to 0.4 μL/mL were 12.9 times more likely to be inhibited than those exposed to 0.3 μL/mL (p = 0.0001). Conclusions: CEO was found to be effective against E. coli strains tested at high bacterial densities that can usually be found per gram of faeces in rabbits affected by colibacillosis. Consequently, cinnamon should be useful in preventing colibacillosis by limiting the replication of E. coli, as it is usually found in lower densities in the intestines of healthy rabbits, preventing the onset of colibacillosis and reducing the use of antibiotics in rabbit farms.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.