New McMaster Egg Counts

I did another egg count; my old way (which I now realize is wrong) was to count all the eggs I saw, whether in the grid or not.   This egg count = 1300 epg, which is similar to what I’ve been getting since reinfecting with 10 hookworms last September.  The bad news, is the egg count hasn’t gone down at all, so my regression isn’t due to any worms dying, or loss of fecundity.

But I did a much more thorough microscope evaluation this time, and 12 of those eggs were out of the grid.  So my real egg count would be 700 epg.  Which makes a lot more sense worm-wise, since I’ve been wondering how my egg count could be so high for such a small amount of worms.

The Nottingham allergy trial gave everyone 10 hookworms and did quantitative egg count in all 15 participants.  2 didn’t show an egg count at all, and the other 13 had from 90 – 200 epg.  Another study, which followed one person infected with 5 parasites over the course of 17 years, estimated that the average egg count for a single adult female in the prime of her life was 50 epg.  So a count of 700 epg would assume 14 females.  My first counts of 800 epg after the initial 10 worms could have been more like 400 – 500 epg depending on how many eggs were out of the grid.  So I may have gotten a disproportionate amount of females, or this is just the margin of error involved in the process.  I know egg count isn’t definitive of population, since the egg output is supposed to peak at 6 months, and decline more significantly after a year of so.  Also, many texts I’ve read said that Necator lives an average of 2 years, but can live up to 17, but most likely, every year, worms are dying or just moving into middle age.  Do female worms go into menopause and stop egg laying?  Does it matter?

A light infection is considered < 2000 epg.  I was getting a little concerned, when I was getting 1400 epg, thinking, God, I’m going to move into a medium intensity infection, which is where the iron deficiencies usually strike, and since I’m already dealing with iron and magnesium deficincies, what’s it going to be like adding more worms?  Both times last year, my Crohn’s improved while my mineral deficincies got worse, but the first time, I got a series of iron shots that probably threw the low magnesium even lower, and the second time, I got pregnant, which also uses up a larger amount of minerals.  Of course, then the miscarriage, so I’m limping along trying to up my mineral consumption, while still losing it from diarrhea and menstruation every month.

But I feel bolstered that I have plenty room to add and will still be in the low intensity infection range.  But I wonder, for those getting 50 worms, what their egg count would be?  25 females would be about 1250 epg, so it would still be in the low intensity infection range.  And I wonder if we need a medium intensity infection to stay in remission?  Would I not have these drops of efficacy if I hosted a higher number of worms?

Oh God, too many unanswered questions.  I wish I knew the protocol that would work the best and leave me suffering the least.

Back to the microscope, hoping I can put myself out of my misery soon.

  1. Sandra’s avatar

    when is the earliest after first inoculation to start counting/looking for Necator americanus eggs?
    ? 8, 10 weeks.

  2. admin’s avatar

    6 weeks is a little early. By 8-10 weeks you should see some eggs. There’s an egg counting group on Facebook who use an easier method than McMaster…I’ll provide a link in a bit.


Your email address will not be published. Required fields are marked *