The Complete Guide To Chicken Parasites: Part 2

The Complete Guide To Chicken Parasites Blog Cover

Note: This is the second of a two part series on chicken parasites. This article will focus on internal parasites and the first part of the series focused on external parasites.

In the first half of this series we focused on discussing the harm that parasite can cause your chickens. We won’t repeat this information again; however just remember the key takeaway: prevention is far better than curing.

Let’s now turn our attention to internal parasites and look at the how you can spot the parasite and more importantly, cure the parasite.

Worms

Worms are by far the most common internal parasite and unfortunately there are a wide variety of worms.

The good news is that with care and tidy housekeeping you should be able to keep your girls worm free.

Chickens that roam outside are unfortunately the most likely bird to catch a form of worms.

There are two methods by which a bird can become infected – direct and indirect. Direct is when the bird forages and eats the parasite’s eggs from infected poop or pasture. Indirectly is when the hen eats another creature (e.g. earthworm, snail or slug) which is already infected with the parasite

How To Stop Chicken’s Getting Worms.

Prevention is far better than curing and some relatively simple measures can help to keep worms at bay:

  • The parasites’ eggs love wet, warmish, mucky areas, so make sure to keep your runs clean and mud free.
  • Keep the litter/bedding inside your coop fresh and dry, also make sure to clean up the poop frequently. If you’ve had particularly bad weather and the litter gets damp- discard it as soon as possible.
  • Worm eggs are destroyed by UV light from the sun, so keep the grass in the run short.
  • Sometimes wild birds spread the parasite to your flock- make sure to keep wild birds out of your runs/coops.
  • Quarantine new birds and if the bird looks poorly to start with – don’t bring it home.
  • Give your flock plenty of room, overcrowding leads to many problems, not just parasites.
  • Use apple cider vinegar or crushed garlic gloves in their water once a week- this will help give their gut flora a good balance.

These preventative techniques can be used on any type of worm parasite. However some types of worms require specific treatment, so let’s take a look at the various types of worms which chickens catch and how to treat them.

Roundworms

Roundworms are the most common type of worm to infest a chicken.

Roundworm Chicken Parasite
Modified Roundworm Chicken Parasite by Bob Goldstein, UNC Chapel Hill

If you’re chicken has contracted roundworm, symptoms to look for include: a loss of appetite, watery poop, decreased egg laying, dull comb, wattles and eyes, wanting to be alone, dehydration and a loss of balance.

Very occasionally in severe cases, a worm can migrate to the hens’ oviduct and a worm will be found inside an egg – a decidedly unsavory experience!

Note: As unappealing as it may look, it is not a health threat to humans.

Younger chickens are more susceptible to worms and will struggle to put weight on if they have contracted them. This is why you need to be extra vigilant with young hens, after around 4 months they will develop some resistance to the worms.

Treatment

There are several treatments that can be used.

Wazine is the most common drug used and is approved for poultry use. It comes in a liquid form and needs to be mixed with your chickens’ water.

Whilst your chickens are given Wazine you can’t eat their eggs– this is known as a withdrawal period. The withdrawal period varies from product to product but it’s typically 7-14 days.

Worms are slowly becoming resistant to some of the more common worming medicines, so I advise you to use wormers sparingly and with caution.

Some people worm their flock every 6 months regardless of whether their chickens have worms- my approach is, if you don’t see a problem, don’t unnecessarily treat your chickens with medicine.

Capillary Worms

Areas For Parasite - Chicken
Areas of infection – Capillary Worms

This little critter lives in the crop, esophagus and proventriculus (marked with pink arrows in image opposite) of the bird.

It’s symptoms are very similar to Roundworms: loss of weight, looking tatty, reduction in egg laying and food intake.

The treatment of Capillary worms is the same as Roundworms, and you can use Wazine.

Tapeworms

Tapeworms require an intermediate host (earthworm, snail etc) to be able to infect your bird.

They don’t usually cause too many problems, however they can cause the bird to lose weight and look thin, but they are rarely fatal.

Good coop hygiene and cleanliness is the best way to prevent your chickens from contracting Tapeworms.

Eye Worm

This type of worm is mainly found in warmer climates such as the Southern states of the US.

Again like Tapeworms it requires an intermediate (i.e. cockroach) to spread. Symptoms include scratching at the eye, drainage, redness, swelling and a cloudy discoloration of the eye. If left untreated it can eventually lead to blindness.

To treat Eye Worm you need to use VetRx.

VetRx comes in a canister which you can then sprayed over your chickens. After a few cycles of the spray the worm should be cleaned up.

Gape Worms

These nasty little worms reside in the birds’ respiratory system.

If the infestation becomes severe enough, the affected bird will gape its’ mouth to get air – this is known as ‘the gapes’. Other symptoms include: head shaking, hissing when opening its mouth and stretching its’ neck.

A severely infected bird can die- early signs are lethargy, looking unkempt and a sudden loss of weight.

If the infection is not very sever then a wormer such as Wazine can be used.

Chicken Parasite Medication

However in the case of a bad infection you need to consult your veterinarian. They will typically prescribe Fenbendazole- however be careful as overdosing your bird with this medicine can kill a hen.

Remember: If you are concerned that your birds may have worms, collect a fecal sample from several birds and take it to the vet for testing. The test is relatively quick and cheap.

Protozoa

Protozoa is a single celled organism- most of which are harmless. There are a few however, that can cause havoc in your flock.

The most common and devastating of these protozoan diseases is coccidiosis.

Coccidiosis is usually more problematic in chicks and growing pullets and is usually the prime suspect in the cause of death between the ages of 3-6 weeks.

Chicks Foraging With Mother Hen
Chicks Foraging With Mother Hen

Chicks who forage with their mothers gradually build up immunity to the disease by being exposed to it. However, chicks brought in from outside sources are most likely to suffer since they have no immunity to the Coccidia present in their new surroundings.

It is always best to keep new chicks isolated on clean litter with clean water and food dishes for at least 2 months.

If you intend to expose the chicks to your existing flock, you will need to get them vaccinated by your local vet.

If you are raising chickens organically and do not want to use medications, keep your chicks away from the flock until they are at least 2-3 months old, then you can introduce them to your existing flock.

Watch them carefully during this introduction period and if they show any signs of lethargy, looking tatty, bloody diarrhea – isolate them and treat immediately.

I cannot stress enough the devastation coccidiosis can cause in a henhouse. Although I have never experienced it myself, it is heartbreaking to watch.

As noted many times before prevention is better than cure, so probiotics added to water, a clean henhouse and frequent health checks can all help to avoid this devastating disease.

Toxoplasmosis

Toxoplasmosis is an infection which is caused by Toxoplasma gondii (T. gondii).

This is one of the few parasites which we’ve written about that can effect both humans and chickens. In fact, it’s estimated that 1/3 of people will be infected by Toxoplasma gondii during their lifetime.

It is spread by rodents, flies and cockroaches and is found in the poop of infected animals.

Toxoplasmosis is harmless although to prevent you catching it care should be taken to always wash you’re your hands after being with your birds and make sure to use gloves when you clean out the coop.

Giardiasis

Giardiasis is an incredibly rare parasite and it is usually not problematic unless it overruns the immune system.

Chickens normally catch this parasite through pecking at infected poop (dog, cat etc.) and symptoms include brown watery diarrhea, weight loss and dehydration.

If you suspect your chickens have Giardiasis, visit your local vet and they will prescribe your chickens antibiotics.

Note: Humans can also catch Giardia, so good sanitation and hygiene practices will help to prevent transmission.

Cleanliness Is Key

Making sure your chickens are well kept and free from parasites isn’t easy but providing you keep your coop clean and do regular health checks then you are definitely starting off on the right foot.

That completes our look at internal chicken parasites.

If you missed the first part of the series on external parasites you can catch up here.

It should be stressed that most backyard chickens do not suffer from the more uncommon parasites. As always – good sanitation and housekeeping practices will help to limit the exposure of your flock.

All sick birds should be isolated and watched carefully. Take notes of the behavior of the bird, what symptoms has it got? Watery poop? What color? Eating? Drinking? As gross as it may sound noting all of these things can help you to narrow down the likely suspect disease and will help you treat it more effectively.

Let us know below if you’re going to start keeping a health diary for your chickens!



Comments

  1. Melissa M says

    We have a chicken who is not using her left side. She also has missing feathers on her chest. Not laying. The vet thought it was a muscle strain and gave antibiotics and a cortisone shot. Not much improvement. Could it be worms?

    • The Happy Chicken Coop says

      Hi Melissa,

      I’m sorry to hear this- if you send us an email with photos we will do our best to help,

      Claire

    • The Happy Chicken Coop says

      I would treat the chickens ASAP.

      During the treatment you can’t eat the eggs. You will notice something called a ‘withdrawal period’ written on the medication.

      After this period of time has passed you can continue to eat their eggs.

      Claire

      • Ballesteros Farms says

        Before treatment is it safe to eat the eggs or do I have to throw them away? I have a flock of about 70 and we just discovered this morning that there were worms in the eggs

  2. Kim says

    Is there a product that can be used to get rid of worms (specifically tapeworm) where you can still eat the eggs? What about Safeguard?

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