Your Body's First Responders: The Innate Immune System
Dr Trevor Chetcuti, B.Chiro.Sc, B.App.Sc (Clin), DIBAK, CNET | Clinical Director, Spinewise Maidstone
The moment a cold or flu virus gets past your defences, your body doesn’t wait around to figure out a plan. It already has one. That’s the job of the innate immune system — the part of your immune response that’s on duty every single day, whether you’re sick or not.
Two Types of Immune Defence
Your immune system broadly works in two parts: the innate immune system and the adaptive immune system. The adaptive system learns and builds specific defences over time, which is part of how vaccines and past infections offer future protection. The innate immune system works differently — it’s your body’s general-purpose, always-ready response.
What Makes the Innate Immune System Different
As Trevor explains: “The first line of defence when we start talking about this really is the innate immune system. These are kind of things that are always there, they’re kind of always ready to go.” Unlike the adaptive immune system, the innate system doesn’t need to have seen a particular bacteria or virus before to respond to it — it’s a general, rapid-response system built to act on contact.
What Happens the Moment a Germ Gets In
As Trevor puts it: “When we first start coming into contact with a foreign agent, whether it be bacterial or virus, there’s really our innate immune system that launches that first response.” This first response includes physical barriers like skin and mucous membranes, along with general immune cells that respond quickly to anything that looks foreign, without needing to identify exactly what it is first.
Why This Matters for Understanding Cold and Flu Symptoms
Some of the symptoms we associate with being unwell — inflammation, fever, feeling generally run down — are actually part of this innate immune response doing its job, rather than purely a sign of the illness itself. Understanding this can help reframe why your body reacts the way it does when you catch something, rather than assuming every symptom is simply the infection at work.
Supporting Your Innate Immune System
General factors like adequate sleep, good nutrition and managing stress are broadly understood to support normal immune function, including the innate response. As covered in some of our other posts, these foundational habits don’t guarantee you won’t get sick, but they’re a sensible, evidence-informed place to focus your attention.
When to Get It Checked
If you want a broader look at your overall health and how your lifestyle factors might be supporting (or not supporting) your body this cold and flu season, our Maidstone clinic offers thorough assessments. You can book online or call us on (03) 9318 7758. If you have concerning or worsening symptoms, please see your GP.
Frequently Asked Questions
The innate immune system is your body’s general, always-ready first response to anything foreign. The adaptive immune system builds specific, targeted defences over time, including through past infections and vaccination.
Fever is part of your body’s innate immune response — it’s generally understood to help create conditions that are less favourable for certain pathogens, rather than simply being a symptom to eliminate.
General lifestyle factors like sleep, nutrition and stress management are broadly supportive of immune function, though this isn’t a guarantee against illness. There’s no quick fix that replaces these fundamentals.
No referral is needed. You can book directly with our team, and we recommend bringing any relevant medical reports to your first visit.
About the Author
Dr Trevor Chetcuti, B.Chiro.Sc, B.App.Sc (Clin), DIBAK, CNET
Dr Trevor Chetcuti is Clinical Director at Spinewise in Maidstone, holding dual degrees in Chiropractic and Clinical Science from RMIT University and a Teaching Diplomate in Applied Kinesiology through the International College of Applied Kinesiology (ICAK). He is chairman of ICAK International’s Board of Research and Standards and has spent over 20 years helping patients work through complex health, neurological and pain-related concerns.