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Experiment ID
254
Pathogen
Naegleria fowleri
Agent Strain
LEE strain
Contains Preferred Model
No
Reference
Couch, R. B., Cate, T. R., Douglas, R. G., Gerone, P. J., & . (1966). Effect of route of inoculation on experimental respiratory viral disease in volunteers and evidence for airborne transmission. Bacteriological Reviews, 30, 3.
Exposure Route
intravenous
Response
death
Host type
mice
# of Doses
4.00
Dose Units
no of trophozoites
Μodel
exponential
k
3.07E-07
LD50/ID50
2.26E+06
Description
Mice/Naegleria fowleri LEE strain data 
Dose Dead Survived Total
1E+06 4 16 20
2.5E+06 12 8 20
5E+06 14 6 20
1E+07 20 0 20

 

Goodness of fit and model selection
Model Deviance Δ Degrees 
of freedom		 χ20.95,1 
p-value 		χ20.95,m-k 
p-value
Exponential 3.47 -0.000862 3 3.84 
1 		7.81 
0.325
Beta Poisson 3.47 2 5.99 
0.177
Exponential is preferred to beta-Poisson; cannot reject good fit for exponential.

 

Optimized k parameter for the exponential model, from 10000 bootstrap iterations
Parameter MLE estimate Percentiles
0.5% 2.5% 5% 95% 97.5% 99.5%
k 3.07E-07 2.11E-07 2.31E-07 2.41E-07 3.98E-07 4.21E-07 4.68E-07
ID50/LD50/ETC* 2.26E+06 1.48E+06 1.65E+06 1.74E+06 2.88E+06 3.01E+06 3.28E+06
*Not a parameter of the exponential model; however, it facilitates comparison with other models.

 

Parameter histogram for exponential model (uncertainty of the parameter)

Exponential model plot, with confidence bounds around optimized model

References

  • Haggerty, R. M., & John, D. T. (1978). Innate resistance of mice to experimental infection with Naegleria fowleri. Infection and Immunity, 20, 73–77. Retrieved from http://iai.asm.org/content/20/1/73.short