diff --git a/caimira/apps/calculator/model_generator.py b/caimira/apps/calculator/model_generator.py
index 6b9a6796..290d22d3 100644
--- a/caimira/apps/calculator/model_generator.py
+++ b/caimira/apps/calculator/model_generator.py
@@ -189,9 +189,12 @@ class FormData:
         return form_dict
 
     def validate(self):
+        # Validate number of infected people == 1 when activity is Conference/Training.
+        if self.activity_type == 'training' and self.infected_people > 1:
+                raise ValueError('Conference/Training activities are limited to 1 infected.')
         # Validate number of infected <= number of total people
-        if self.infected_people > self.total_people:
-            raise ValueError('Number of infected people cannot be more than number of total people.')
+        elif self.infected_people >= self.total_people:
+                raise ValueError('Number of infected people cannot be more or equal than number of total people.')
 
         # Validate time intervals selected by user
         time_intervals = [
diff --git a/caimira/apps/calculator/static/js/form.js b/caimira/apps/calculator/static/js/form.js
index 5361a043..6c0525fa 100644
--- a/caimira/apps/calculator/static/js/form.js
+++ b/caimira/apps/calculator/static/js/form.js
@@ -195,16 +195,26 @@ function set_disabled_status(id, option) {
     $(id).removeClass("disabled");
 }
 
-function setMaxInfectedPeople() {
-  $("#training_limit_error").hide();
-  var max = $("#total_people").val()
+function validateMaxInfectedPeople() {
+  let infected_people = document.getElementById("infected_people");
+  removeErrorFor(infected_people);
+  $(infected_people).removeClass("red_border");
+  
+  let infected = infected_people.valueAsNumber;
+  let max = document.getElementById("total_people").valueAsNumber;
 
-  if ($("#activity_type").val() === "training") {
-    max = 1;
-    $("#training_limit_error").show();
+  if ($("#activity_type").val() === "training" && infected > 1) {
+    insertErrorFor(infected_people, "Conference/Training activities limited to 1 infected person.");
+    $(infected_people).addClass("red_border");
+    return false;
+  }
+  else if (infected >= max) {
+    insertErrorFor(infected_people, "Value is equal or higher than the total number of occupants.");
+    $(infected_people).addClass("red_border");
+    return false;
   }
 
-  $("#infected_people").attr("max", max);
+  return true;
 }
 
 function removeInvalid(id) {
@@ -497,6 +507,9 @@ function validate_form(form) {
       }
   }
 
+  //Validate number of infected people
+  if (!validateMaxInfectedPeople()) submit = false;
+
   //Validate all non zero values
   $("input[required].non_zero").each(function() {
     if (!validateValue(this)) {
@@ -876,9 +889,11 @@ $(document).ready(function () {
 
   // Setup the maximum number of people at page load (to handle back/forward),
   // and update it when total people is changed.
-  setMaxInfectedPeople();
-  $("#total_people").change(setMaxInfectedPeople);
-  $("#activity_type").change(setMaxInfectedPeople);
+  validateMaxInfectedPeople();
+  $("#total_people").change(validateMaxInfectedPeople);
+  $("#activity_type").change(validateMaxInfectedPeople);
+  $("#total_people").change(validateMaxInfectedPeople);
+  $("#infected_people").change(validateMaxInfectedPeople);
 
   //Validate all non zero values
   $("input[required].non_zero").each(function() {validateValue(this)});
diff --git a/caimira/apps/templates/base/calculator.form.html.j2 b/caimira/apps/templates/base/calculator.form.html.j2
index 770df231..37d8d932 100644
--- a/caimira/apps/templates/base/calculator.form.html.j2
+++ b/caimira/apps/templates/base/calculator.form.html.j2
@@ -313,11 +313,10 @@
     </div>
 
     <div class="form-group row">
-      <div class="col-sm-4"><label class="col-form-label">Number of infected people: </label></div>
-      <div class="col-sm-6 align-self-center"><input type="number" id="infected_people" class="form-control" name="infected_people" min=1 value=1 required></div>
+      <div class="col-sm-4" style="top: -2px"><label>Number of infected people: </label></div>
+      <div class="col-sm-6"><input type="number" id="infected_people" class="form-control" name="infected_people" min=1 value=1 required></div>
     </div>
 
-    <span id="training_limit_error" class="red_text" hidden>Conference/Training activities limited to 1 infected<br></span>
     <hr width="80%">
 
     <div class="form-group row">
diff --git a/caimira/tests/apps/calculator/test_model_generator.py b/caimira/tests/apps/calculator/test_model_generator.py
index 43c1a657..1dbb4961 100644
--- a/caimira/tests/apps/calculator/test_model_generator.py
+++ b/caimira/tests/apps/calculator/test_model_generator.py
@@ -167,10 +167,20 @@ def test_ventilation_window_hepa(baseline_form: model_generator.FormData):
     assert ventilation == baseline_vent
 
 
-def test_infected_less_than_total_people(baseline_form: model_generator.FormData):
-    baseline_form.total_people = 10
-    baseline_form.infected_people = 11
-    with pytest.raises(ValueError, match='Number of infected people cannot be more than number of total people.'):
+@pytest.mark.parametrize(
+    ["activity", "total_people", "infected_people", "error"],
+    [
+        ['office', 10, 11, "Number of infected people cannot be more or equal than number of total people."],
+        ['office', 10, 10, "Number of infected people cannot be more or equal than number of total people."],
+        ['training', 10, 2, "Conference/Training activities are limited to 1 infected."],
+    ]
+)
+def test_infected_less_than_total_people(activity, total_people, infected_people, error,
+                                         baseline_form: model_generator.FormData):
+    baseline_form.activity_type = activity
+    baseline_form.total_people = total_people
+    baseline_form.infected_people = infected_people
+    with pytest.raises(ValueError, match=error):
         baseline_form.validate()