Table. Epidemiological parameters used in the estimation of transmission in an outbreak of chikungunya in Central Italy, 2017.

Parameter	Unit	Distribution	Min and max a parameter value	Reference
Date of imported infection	Date	Uniform	1 May; 15 Nov	NA
Mosquito biting rate	Bites/mosquito/day	Uniform	0.08; 0.10	Own estimate from [7]
Probability of vector-to-human transmission per bite	%	Uniform	14; 84	[21]
Probability of human-to-vector transmission per bite	%	Uniform	75; 90	[22]
Extrinsic incubation period	Days	Uniform	2; 3	[23]
Intrinsic incubation period	Days	Uniform	1; 12	[24]
Human infectious period	Days	Uniform	2; 7	[24]
Probability of developing symptoms	%	Uniform	65; 93	[25]
Probability of being detected	%	Uniform	44; 80	[25]
Delay between symptom onset and detection	Days	Gamma	Scale: 8.53; shape: 1.725	Own estimate from [26]

Max: maximum; min: minimum; NA: not applicable.

^a Unless otherwise specified.