Fix default immune length alpha and beta

AMReX-Agent · Jan 28, 2025 · 675fb55 · 675fb55
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Showing 3 changed files with 6 additions and 6 deletions.
diff --git a/docs/source/usage/how_to_run.rst b/docs/source/usage/how_to_run.rst
@@ -130,10 +130,10 @@ The following inputs specify the disease parameters:
 * ``disease.vac_eff`` (`float`, default ``0``)
     The vaccine efficacy - the probability of transmission will be multiplied by one minus this factor.
     `Vaccination is not yet implemented, so this factor must be left at 0`.
-* ``disease.immune_length_alpha`` (`float`, default ``9.0``)
+* ``disease.immune_length_alpha`` (`float`, default ``540.0``)
     Alpha parameter for the immunity length Gamma distribution. The immunity length is the length of time in days that agents
     are immune to the disease after recovering from it. For a Gamma distribution, the mean is alpha*beta and the variance is alpha*beta^2.
-* ``disease.immune_length_beta`` (`float`, default ``20.0``)
+* ``disease.immune_length_beta`` (`float`, default ``0.33``)
     Beta parameter for the immunity length Gamma distribution. The immunity length is the length of time in days that agents
     are immune to the disease after recovering from it. For a Gamma distribution, the mean is alpha*beta and the variance is alpha*beta^2.
 * ``disease.latent_length_alpha`` (`float`, default ``9.0``)

diff --git a/examples/inputs.defaults b/examples/inputs.defaults
@@ -92,9 +92,9 @@ disease.asymp_relative_inf = 0.75
 # Vaccine efficacy. Not yet implemented; leave at 0.
 disease.vac_eff = 0
 # Alpha parameter for the immume length Gamma distribution. The immune length is the length in days that agents are immune after recovery from an infection.
-disease.immune_length_alpha = 9.0
+disease.immune_length_alpha =540.0
 # Beta parameter for the immume length Gamma distribution. The immune length is the length in days that agents are immune after recovery from an infection.
-disease.immune_length_beta = 20.0
+disease.immune_length_beta = 0.33
 # Alpha parameter for the latent length Gamma distribution. The latent length is the length in days from infection until an agent becomes infectious.
 disease.latent_length_alpha = 9.0
 # Beta parameter for the latent length Gamma distribution. The latent length is the length in days from infection until an agent becomes infectious.

diff --git a/src/DiseaseParm.H b/src/DiseaseParm.H
@@ -82,8 +82,8 @@ struct DiseaseParm
     Real child_compliance; /*!< Child compliance with masking ?? */
     Real child_HH_closure; /*!< Multiplier for household contacts during school closure */
 
-    Real immune_length_alpha = Real(9.0);  /*! alpha parameter for gamma distribution*/
-    Real immune_length_beta = Real(20.0);  /*! beta parameter for gamma distribution*/
+    Real immune_length_alpha = Real(540.0);  /*! alpha parameter for gamma distribution*/
+    Real immune_length_beta = Real(0.33);  /*! beta parameter for gamma distribution*/
 
     Real latent_length_alpha = Real(9.0);  /*! alpha parameter for gamma distribution*/
     Real latent_length_beta = Real(0.33);  /*! beta parameter for gamma distribution*/