. Author manuscript; available in PMC: 2016 Jan 1.

Published in final edited form as: J Occup Environ Hyg. 2015;12(4):266–275. doi: 10.1080/15459624.2014.974808

Table I.

Parameters for predicting pathogen loading on hands

Parameter	Definition
Contact Frequencies
H_surface,j	Rate of hand-to-fomite contacts for the j^th surface type
H_orifice,n	Rate of hand-to-mouth contacts for the n^th orifice
Surface Areas
A_surface	Area of the hand in contact with a fomite
A_hand	Area of the hand
A_orifice,n	Area of the hand in contact with the n^th orifice
FSA	Fraction of surface area per area of the hand per contact
Pathogen Transfer Efficiencies
f_12,j	Fomite-to-hand transfer efficiency for the j^th surface type
f₂₁	Hand-to-fomite transfer efficiency
f₂₃	Hand-to-orifice transfer efficiency
Pathogen Inactivation
α_die-off	Expected fraction of pathogen inactivated per hour
Pathogen Loading
C_surface	Concentration of pathogens on the surface (pathogens/cm²)
C_hands	Concentration of pathogens on the hands (pathogens/cm²)