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Influenza, and Viral Resistance

By Dr. Paul Anderson

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There is a great deal we do at AMT aimed at helping prevent and treat viral illnesses.  Below are some ideas you can consider during the “flu” season, and in general regarding your immunity.


Seasonal Influenza, H1N1, and even the “common cold” are seemingly inevitable.  Questions arise regarding the ability to lower the risk of infection as well as measures which may shorten the duration of illness should one become infected.  This paper will look at known and less known measures particular to influenza and generally to viral infections.

Immunity and Hygiene:

Hygienic measures are common to human general immunity.  Things such as hand washing, avoidance of infected persons, and staying home if infected are well publicized measures.  Other measures which can affect the ability of the human body to resist infection, and fight infection in a more efficient way include the following.


Proper rest is essential to the removal of oxidants and toxins from the body (all of which can slow immune function) but also sleep is involved in the regeneration of immune cell function in the human body (Lange).  Sleep deprivation is known to increase the chance of becoming infected if exposed.


General exercise or movement daily is associated with improved immunity.  In some studies extreme levels of exercise are associated with decreased immune function however, so cold and flu season is likely not the time to start a strenuous exercise program you are not used to(UI)..  Taking a walk daily is an excellent way to get your body moving, and will help circulate your blood and aid the body in removing toxins and oxidants


Stress has varied presentations and varied effect on the human immune system.  The best way to summarize thirty years research into stress and immunity (Segerstrom) would really be that your response to the stress makes a very big difference in how it affects your immunity.  Generally stress has negative effect on immunity; however some stressors are more damaging than others.  Keeping a healthy relationship to your own stressors (not feeling like a victim, talking about it, changing your surroundings, exercising etc.) is the best way to minimize any negative effect stress may have on your body.


 A few basic principles can guide healthy eating habits.  Sugar is a stressor on the immune system, so any excess sugars should be minimized in order to improve immune function.  Simple sugars and refines processed foods are the worst offenders, but all sugar intake should be limited (Bernstein) (Sanchez).  In general lean protein sources, high fiber carbohydrate containing foods and lots of brightly colored vegetables offer the most nutrition per calorie, and the least likely negative effect on immunity and health.

Additionally, a diet supportive of proper GI flora balance (the bacteria that live in the GI tract and maintain digestive and immune function there) may have a great impact on your general immunity (Huffnagle, Rees).  In general occasional supplementation with lactobacillus acidophilus, bifido bacteria and fructo-oligo saccharides (FOS) are enough to aid this portion of immunity.  Antibiotic use orally and long illnesses can decrease these good bacteria, so supplementing after those events is recommended.


Nutrients, Botanicals and Viral Immunity:

(This section synthesized from Cannell, Cathcart, Huffnagle, Reese, Serkedjieva, Thorne and Zakay-Rones)

Vitamin D:

Vitamin D has known anti-viral properties [1] and has been directly associated with fighting influenza in a recent scientific review.

If a person has vitamin D levels on their blood testing that are less than the upper 25% of the listed reference range they should take 5000 IU vitamin D daily to raise those levels.  During an active infection extra vitamin D is required.  Cannell recommends 2000IU per kilogram of body weight, but at least 50,000 IU per day while ill is a good start.  In a viral infection, the body can draw on vitamin D stores  to supply the increased needs of the immune system.  Supplementation with 4,000 to 10,000 IU/day doses for a few days after an illness can replenish the body stores of Vitamin D if the person had good levels prior to the illness.

Vitamin C:

Quote from  Cannell:  “Strong evidence shows that high doses of vitamin C prevent common colds and reduce a cold’s severity and duration.  Given the similarities between cold and influenza viruses, the scientific case for treating influenza with vitamin C has been investigated and shown to have merit.  Fighting influenza with vitamin C has been tested in the clinical setting and reported to be effective at very high doses.”

Dr Robert Cathcart was one of the pioneers in oral high dose vitamin C during acute infections.   He would have patients take 2000 mg vitamin C every one to two hours at the first sign of illness, until their bowels became loose (or “to bowel tolerance”) (Cathcart).   High dose vitamin C (20,000 and 100,000 mg/day) are surprisingly well tolerated during periods when the immune system is fighting viral infections. This kind of acute dosing is best divided into as many doses per day as possible, beginning immediately at the first sign of a viral infection.

The B-Vitamins:

The B-Vitamins in general, and Niacin (B3), Thiamine (B1) (Cannell) have important effects in immune function in humans.  Once illness begins the use of B vitamins by the body increases due to metabolic demand so even if one has reasonable levels of these vitamins prior to a viral illness they may become deficient during the illness.  At the very least one should take a high potency B-complex during illness, and for general prevention.

Botanical (Herbal) extracts:

Sambucus (elderberry):

Black elder extracts are likely the best studied for influenza, and have some impressive studies behind their use (Serkedjieva , Thorne, Zakay-Rones).  Due to these studies as well as general information from the media sambucus has become a well known and easily available in health food stores.  Generally the commercially available sambucus syrup has been used at a dose of 2 tablespoons (children) and 4 tablespoons (adults) during early exposure to influenza, or during exposure.  These doses conferred a significant reduction in time of illness in those infected.


Mushrooms can be quite helpful in supporting immunity.  Those best to incorporate into your diet are the shitake and mitake mushrooms.  Other strong mushroom extracts can be used in supplement form but are often not very palatable in culinary applications.


Antiviral Medications:

Currently, in addition to the use of influenza vaccines) there are few true anti viral medications available for influenza.  The two groups available are zanamivir or oseltamivir (used to treat and prevent influenza A and B infections) and amantadine or rimantadine (used to prevent or treat influenza A infections).  These medications are used early in an infection to decrease the time symptoms are present during an influenza infection, by slowing viral replication.  All have various activities against influenza strains, but influenza can mutate to be resistant to these medications.  As CDC recommendations change for the use of these medications in specific instances a physician should be consulted to decide if they are appropriate for your situation.



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  • Cannell JJ; H1N1 Flu and Vitamin D; The Vitamin D Newsletter May 2009; http://www.vitamindcouncil.org/newsletter/h1n1-flu-and-vitamin-d.shtml
  • Cannell JJ, et.al.; Epidemic influenza and vitamin D; Epidemiol. Infect. (2006), 134, 1129–1140. f 2006 Cambridge University Press doi:10.1017/S0950268806007175
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