Giardia and other protozoan infections: Dientamoeba fragilis and Blastocystis hominis the real culprint?

Submitted by biohazard on Wed, 2010-03-24 12:23

I've been researching Giardia and was (and was not) surprised to see that there is a chronic form to this bug. I've found some good links below. The preferred effective MD treatment seems to be Tinidazole. From what I've read Flagyl/Metronidazole has no activity on Giardia.

"Tinidazole is indicated for the treatment of giardiasis in adults with a single 2 g dose and with 50 mg/kg single dose in children over 3 years of age. In eight randomized comparative studies totalling 299 adult and pediatric patients, the average cure rate for tinidazole in giardiasis was 90%.2-8"

(Other Giardia links at the bottom)

Giardia is supposed to feed off Lecithin and Ox Bile (perhaps human bile?).

In researching giardia I found out about some other protozoans that are causing chronic problems very similar to what Cpn and Lyme patients deal with. These are: Dientamoeba fragilis and Blastocystis hominis.

The symptoms are similar to Giardia as well as the chronic symptoms of Lyme and CPN. This site: has a lot of information about these critters, testing and cure. You'll notice how many have attempted drugs and cocktails (including Flagyl and some of our other favorties here) even done several rounds of them (pulse) to try to cure themselves.

Jackie Delaney at badbugs seems to have found a triple abx cocktail that is having some success. The difference in treatment between lyme/cpn and these bugs if that, if effective, the cure takes 10 days.

If you are interested in the drug combination without having to run through the Jackie gauntlet see this thread for the drug combo:


Link to full blog entry:

Thank you for printing this.

These are the two parasites I was diagnosed with before the MS and the lyme diagnosis were even mentioned. Hpylori was then diagnosed.

More pieces of this puzzle.When will it ever fit together?

diagnosed MS Jan.2000 ,  chronic neurological lyme disease Nov.2002.

doxy 100 mg. 1BID. roxy.150 mg.? BID,adding rifampin soon, pulsed tini. every 3 weeks, as of oct.17/08, rifampin,naltrexone (LDN),NAC, nystatin, major wheldon supplemrnts daily,



 this is no longer the first line treatment. (Because furazolidone is too toxic and in most countries not allowed)

I got the new protocoll from the centre of digestive diseases.(The developer)

 this is the new one



Dientamoeba fragilis and Blastocystis hominis are parasites found in the human digestive tract and

many of those infected are asymptomatic carriers. They can, however, cause a range of

gastrointestinal symptoms including diarrhoea and/or constipation, bloating, flatulence, loss of

appetite, abdominal discomfort and pain. In chronic cases, symptoms can include weight loss, blood

in the stool, dizziness, nausea and vomiting, rectal itching, chronic fatigue and depression. D. fragilis

has also been implicated in some cases of colitis/ bowel inflammation. Many people suffer symptoms

for years before diagnosis and are often misdiagnosed with irritable bowel syndrome (IBS). It is

possible to treat this infection with a combination of drugs – after which, most patients report either a

complete resolution, or a great reduction, in symptoms.

Medication schedule:

The patient will take a combination of four medications for 10 days.

- Septrin DS (20 Tablets) 2 times a day

- Diloxinide Furoate 500 mg (30 Capsules) 3 times a day

- Secnidazole 400 mg (30 Capsules) 3 times a day

- Doxycycline 50 mg (20 Tablets) 2 times a day






400 mg


50 mg

Breakfast 1 Tablet 1 Capsule 1 Capsule 1 Tablet

Lunch 0 1 Capsule 1 Capsule 0

Dinner 1 Tablet 1 Capsule 1 Capsule 1 Tablet

These medications should be taken at the same time every day with food.

These medications have been known to cause the following side effects:

- Nausea and vomiting - Dizziness

- Headaches - Itching

- Tiredness

The patient should avoid drinking alcohol for the duration of treatment.

To ensure successful treatment of D. fragilis, B. hominis it is important that the patient complete the

entire 10 day medication schedule.

Follow-up treatment:

Three or four weeks after finishing the treatment protocol the patient should repeat the stool test to

determine whether the parasites have been eradicated.


Centre for Digestive Diseases



Male 38 years (Germany),CFIDS, IBS, Enterovirus, Cpn and Bartonella, Dientamoeba fragilis positive. Started Cap on 02/19/08, Currently taking Bactrim, Flagyl, soon adding Malarone and Clindamycin for suspected protozooa. 

Cesare, excellent! thanks for that update.

Doxy 100mgx2, Azithromycin 250mg MWF, Probiotics: PB8, JarrowDophilus. CFS since 2003. Last 5+ years lots of the usual research (Depression, Adrenal Fatigue, HPA, Mercury, Candida, Thyroid, etc.). $5 coupon code: HAW103