Table 4.

Gaps in our knowledge related to surrogate selection and model parameters.

Gaps	Recommended action
No quantitative comparisons of spore survival on fomites	Conduct experiments using steel, laminar, plastic and other surfaces
No quantitative comparisons of spore survival in soil	Conduct experiments across soil types
No quantitative comparisons of spore survival in buffer/water	Conduct survival experiments in water or buffer
No long-term studies	Perform spore survival studies that are over a year long
Only one comparative study examining the effect of heat in various buffers	Reconfirm results
Only one comparative study with UV	Reconfirm results
Only a few studies with virulent Bacillus anthracis	Use virulent B. anthracis and compare directly to potential surrogates