diff --git a/include/epiworld/models/surveillance.hpp b/include/epiworld/models/surveillance.hpp
index 7a6cee23..9b2bb9f8 100644
--- a/include/epiworld/models/surveillance.hpp
+++ b/include/epiworld/models/surveillance.hpp
@@ -304,7 +304,7 @@ inline ModelSURV<TSeq>::ModelSURV(
     model.add_param(prob_noreinfect, "Prob. no reinfect");
 
     // Virus ------------------------------------------------------------------
-    epiworld::Virus<TSeq> covid("Covid19", prevalence, true);
+    epiworld::Virus<TSeq> covid("Covid19", prevalence, false);
     covid.set_state(LATENT, RECOVERED, REMOVED);
     covid.set_post_immunity(&model("Prob. no reinfect"));
     covid.set_prob_death(&model("Prob. death"));