From:  Advancing infectious disease research through a chicken embryo model for developmental studies and antimicrobial screening of lipid nanoparticles

 Proposed standardization framework for CEM-based studies.

ParameterRecommendationNotes
Inoculation timingED5–10 for systemic studies; ED12–18 for immune response assessmentAdjust based on pathogen/study goal
Microbial doseReport in CFU/μL or per egg; determine sublethal/lethal ranges via titrationEnsures reproducibility
Environmental conditionsTemperature 37–38°C; humidity 40–80%Maintain consistently
Administration routeSpecify in ovo vs. ex ovo, injection site, volume, and techniqueImpacts survival/outcomes
Experimental endpointsEmbryo survival, pathogen colonization, immune markers, histology, imagingStandardized readouts improve comparison
Replicates and controlsInclude biological and technical replicates; positive/negative controlsEnsures statistical robustness

CEM: chick embryo model.