diff --git a/cara/models.py b/cara/models.py
index 26cbf548..b084be22 100644
--- a/cara/models.py
+++ b/cara/models.py
@@ -459,7 +459,7 @@ class SARSCoV2(Virus):
         CERN-OPEN-2021-004, DOI: 10.17181/CERN.1GDQ.5Y75)
         """
         halflife = np.empty_like(humidity)
-        halflife[humidity <= 0.4] = 3.8
+        halflife[humidity <= 0.4] = 6.43
         halflife[humidity > 0.4] = 1.1
         return halflife
 
diff --git a/cara/monte_carlo/data.py b/cara/monte_carlo/data.py
index ea4977b1..47f0f901 100644
--- a/cara/monte_carlo/data.py
+++ b/cara/monte_carlo/data.py
@@ -99,8 +99,9 @@ symptomatic_vl_frequencies = LogCustomKernel(
     kernel_bandwidth=0.1
 )
 
-# From https://doi.org/10.1093/cid/ciaa1579
-viable_to_RNA_ratio_distribution = Uniform(0.15, 0.45)
+# Derived from data in doi.org/10.1016/j.ijid.2020.09.025 and
+# https://iosh.com/media/8432/aerosol-infection-risk-hospital-patient-care-full-report.pdf (page 60)
+viable_to_RNA_ratio_distribution = Uniform(0.01, 0.6)
 
 # From discussion with virologists
 infectious_dose_distribution = Uniform(10., 100.)