diff --git a/app/workers/alert_check_worker.rb b/app/workers/alert_check_worker.rb
new file mode 100644
index 000000000..83b8056d2
--- /dev/null
+++ b/app/workers/alert_check_worker.rb
@@ -0,0 +1,24 @@
+class AlertCheckWorker < ApplicationWorker
+  include SearchAlertList
+
+  def perform(document_type:, display_name:)
+    content_items = get_alert_content_items(document_type:)
+    delivered = 0
+    content_items.each do |ci|
+      if any_emails_delivered_for?(ci[:content_id], ci[:valid_from])
+        delivered += 1
+      else
+        Rails.logger.warn("Couldn't find any delivered emails for #{display_name}s with content id #{ci[:content_id]} (at #{ci[:url]})")
+      end
+    end
+
+    Rails.logger.info("Checking #{display_name}s: #{delivered} out of #{content_items.count} alerts have been delivered to at least one recipient")
+
+    Rails.cache.write("current_#{document_type}s", content_items.count, expires_in: 15.minutes)
+    Rails.cache.write("delivered_#{document_type}s", delivered, expires_in: 15.minutes)
+  end
+
+  def any_emails_delivered_for?(content_id, valid_from)
+    Email.where("notify_status = 'delivered' AND content_id = ? AND created_at > ?", content_id, valid_from).exists?
+  end
+end
diff --git a/spec/workers/alert_check_worker_spec.rb b/spec/workers/alert_check_worker_spec.rb
new file mode 100644
index 000000000..c0cfe2208
--- /dev/null
+++ b/spec/workers/alert_check_worker_spec.rb
@@ -0,0 +1,71 @@
+RSpec.describe AlertCheckWorker do
+  include SearchAlertListHelpers
+
+  describe "#perform", caching: true do
+    def perform
+      described_class.new.perform(document_type: "medical_safety_alert", display_name: "Medical Safety Alert")
+    end
+
+    context "there are no alerts older than an hour" do
+      before { stub_medical_safety_alert_feed(content_id: SecureRandom.uuid, age: 30.minutes) }
+
+      it "should put 0/0 in the cache" do
+        expect(Rails.cache).to receive(:write).with("current_medical_safety_alerts", 0, expires_in: 15.minutes)
+        expect(Rails.cache).to receive(:write).with("delivered_medical_safety_alerts", 0, expires_in: 15.minutes)
+        perform
+      end
+    end
+
+    context "there are no alerts younger than 1 day" do
+      before { stub_medical_safety_alert_feed(content_id: SecureRandom.uuid, age: 2.days) }
+
+      it "should put 0/0 in the cache" do
+        expect(Rails.cache).to receive(:write).with("current_medical_safety_alerts", 0, expires_in: 15.minutes)
+        expect(Rails.cache).to receive(:write).with("delivered_medical_safety_alerts", 0, expires_in: 15.minutes)
+        perform
+      end
+    end
+
+    context "there is a valid alert with delivered emails" do
+      before do
+        content_id = SecureRandom.uuid
+        stub_medical_safety_alert_feed(content_id:, age: 2.hours)
+        create(:email, content_id:, notify_status: "delivered")
+      end
+
+      it "should put 1/1 in the cache" do
+        expect(Rails.cache).to receive(:write).with("current_medical_safety_alerts", 1, expires_in: 15.minutes)
+        expect(Rails.cache).to receive(:write).with("delivered_medical_safety_alerts", 1, expires_in: 15.minutes)
+        perform
+      end
+    end
+
+    context "there is a valid alerts with undelivered emails" do
+      before do
+        content_id = SecureRandom.uuid
+        stub_medical_safety_alert_feed(content_id:, age: 2.hours)
+        create(:email, content_id:, notify_status: nil)
+      end
+
+      it "should put 1/0 in the cache" do
+        expect(Rails.cache).to receive(:write).with("current_medical_safety_alerts", 1, expires_in: 15.minutes)
+        expect(Rails.cache).to receive(:write).with("delivered_medical_safety_alerts", 0, expires_in: 15.minutes)
+        perform
+      end
+    end
+
+    context "there is a valid alert with delivered emails that are too old to be valid" do
+      before do
+        content_id = SecureRandom.uuid
+        stub_medical_safety_alert_feed(content_id:, age: 2.hours)
+        create(:email, content_id:, notify_status: "delivered", created_at: Time.zone.now - 3.hours)
+      end
+
+      it "should put 1/0 in the cache" do
+        expect(Rails.cache).to receive(:write).with("current_medical_safety_alerts", 1, expires_in: 15.minutes)
+        expect(Rails.cache).to receive(:write).with("delivered_medical_safety_alerts", 0, expires_in: 15.minutes)
+        perform
+      end
+    end
+  end
+end