| Clarification on certain disease model parameters [message #635631] |
Wed, 27 October 2010 10:48  |
 Traci Arthur-Hartranft
Messages: 9
Registered: August 2010 |
Junior Member |
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Hi - Can you help me with some clarification on specification of transmission rate and infectious mortality rate disease parameters?
Specifically, I think I was mistakenly always assuming the transmission rate for the disease input was basically the R0 value because most of the examples I saw for the STEM documentation were in the 1 to 2 range. But, if I understand right, you are actually looking for beta, from which R0 can be calculated as beta/gamma (transmission rate/recovery rate)? I just want to verify this because if I assume an R0 of 1.3 and a recovery rate of .175 (standard flu type parameters) I would want to enter a transmission rate of .23 which is much smaller than any of the disease Beta inputs I've seen as examples.
And I understand the units for recovery rates, incubation rates etc. as per day, with their relationship to the duration of infectiousness and the incubation period being clear. But I'm having a hard time with the infectious mortality rate. I'm finding that that is typically specified as # of deaths per 1000 individuals per year. Yours is in terms of population member/time period (i.e.,day)? Do we get this from something like the case fatality ratio?
Sorry for the remedial questions but I couldn't find specific documentation on this in the Help. My main concern is that, on our end, we enter a correct *transmission rate* and not a R0 value inappropriately.
Thanks - Traci
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