diff --git a/src/eligibility_signposting_api/model/rules.py b/src/eligibility_signposting_api/model/rules.py
index 5888a3a34..06770d783 100644
--- a/src/eligibility_signposting_api/model/rules.py
+++ b/src/eligibility_signposting_api/model/rules.py
@@ -159,7 +159,7 @@ class CampaignConfig(BaseModel):
     approver: str | None = Field(None, alias="Approver")
     reviewer: str | None = Field(None, alias="Reviewer")
     iteration_frequency: Literal["X", "D", "W", "M", "Q", "A"] = Field(..., alias="IterationFrequency")
-    iteration_type: Literal["A", "M", "S"] = Field(..., alias="IterationType")
+    iteration_type: Literal["A", "M", "S", "O"] = Field(..., alias="IterationType")
     iteration_time: str | None = Field(None, alias="IterationTime")
     default_comms_routing: str | None = Field(None, alias="DefaultCommsRouting")
     start_date: StartDate = Field(..., alias="StartDate")
diff --git a/tests/unit/services/calculators/test_eligibility_calculator.py b/tests/unit/services/calculators/test_eligibility_calculator.py
index 56a9b8911..f1e40ea79 100644
--- a/tests/unit/services/calculators/test_eligibility_calculator.py
+++ b/tests/unit/services/calculators/test_eligibility_calculator.py
@@ -4,7 +4,7 @@
 import pytest
 from faker import Faker
 from freezegun import freeze_time
-from hamcrest import assert_that, contains_exactly, contains_inanyorder, equal_to, has_item, has_items
+from hamcrest import assert_that, contains_exactly, contains_inanyorder, equal_to, has_item, has_items, is_in
 
 from eligibility_signposting_api.model import rules
 from eligibility_signposting_api.model import rules as rules_model
@@ -153,6 +153,35 @@ def test_only_live_campaigns_considered(faker: Faker):
     )
 
 
+@pytest.mark.parametrize(
+    "iteration_type",
+    ["A", "M", "S", "O"],
+)
+def test_campaigns_with_applicable_iteration_types_considered(iteration_type: str, faker: Faker):
+    # Given
+    nhs_number = NHSNumber(faker.nhs_number())
+
+    person_rows = person_rows_builder(nhs_number)
+    campaign_configs = [rule_builder.CampaignConfigFactory.build(target="RSV", iteration_type=iteration_type)]
+
+    calculator = EligibilityCalculator(person_rows, campaign_configs)
+
+    # When
+    actual = calculator.evaluate_eligibility()
+
+    # Then
+    assert_that(
+        actual,
+        is_eligibility_status().with_conditions(
+            has_item(
+                is_condition()
+                .with_condition_name(ConditionName("RSV"))
+                .and_status(is_in([Status.actionable, Status.not_actionable, Status.not_eligible]))
+            ),
+        ),
+    )
+
+
 def test_base_eligible_and_simple_rule_includes(faker: Faker):
     # Given
     nhs_number = NHSNumber(faker.nhs_number())