Diseases In Chicken With Pictures


“Diseases In Chicken With Pictures” This is a complete ebook that lists down every diseases in chickens and how it effects the chicken. The photographs show the common symptoms of the diseases, how to diagnose them, list of medicines and which one to use depending on the disease.

Diseases in chicken with pictures . Today I want to show you a disease that is mostly seen with chicks.



In common terms, a disease is an abnormal condition that is caused by infection, basic weaknesses, or environmental stress. A disease is defined by a specific group of signs or symptoms. Diseases prevent affected animals from functioning normally.

Health is the overall condition of an animal at a given time. Disease causes this condition to weaken. This can result in poor productivity and reduced quality of the affected animals. It could even lead to the death/loss of one or all of the birds in a flock.

Diseases can be categorized by common causes, such as genetic, mechanical, toxic, and nutritional. Infectious diseases are caused by viruses, bacteria, and fungi. Parasitic diseases are caused by protozoa, worms, and external parasites such as mites and lice.

Infectious agents, commonly referred to as “germs,” move from one susceptible bird to another in order to survive. For this to occur in a flock, a sufficient number of disease-causing agents must be able to gain access to the susceptible birds. These are birds that have no immunity or other resistance against these agents or whose defense mechanisms have been reduced or overwhelmed at the time of infection.


Certain diseases have the potential to decimate a region’s poultry industry. When one of these diseases strikes, a quarantine or embargo could suddenly be placed on a region or nation. This could cause widespread economic hardship for both commercial and small flock owners. To protect their animals—and the poultry industry—flock owners must be able to identify diseases quickly to prevent them from spreading to other animals. The sooner a disease is identified and action is taken, the better.


Diseases are spread by:

  • Direct contact (bird-to-bird, infected manure)
  • Indirect contact (contaminated equipment, people, environment)
  • Vectors (wild animals, rodents, insects)

In addition, infectious agents need a “home base,” or reservoir of the disease, to persist in an area. This reservoir could be other birds or organic matter providing life support for these agents. Disrupting the methods by which diseases are spread can greatly reduce the threat to your flock.


Some diseases have a greater effect and higher consequences for the bird population than other diseases. One of these, pullorum-typhoid disease, caused such concern that it prompted the creation of the National Poultry Improvement Plan. Active efforts by the NPIP to control this disease have proven very successful, and as a result, the disease has nearly been eradicated. However, pullorum-typhoid testing needs to be continued due to continued exposure from imported birds and other sources.

While concern about pullorum-typhoid disease has been reduced significantly, other diseases still threaten today’s poultry population. Two of these are avian influenza and Exotic Newcastle Disease.

By becoming educated about these diseases, flock owners can protect their birds and promote better animal health. Below are descriptions of these diseases, including their symptoms, how they are spread, and effective prevention methods. Take time to become familiar with this information.

Avian Influenza

Avian influenza (AI) is a respiratory disease of birds. AI viruses can infect chickens, turkeys, pheasants, quail, ducks, geese, and guinea fowl, as well as a wide variety of other birds. Migratory waterfowl seem to be a natural reservoir/host for AI viruses. Type A influenza viruses are classified according to the severity of illness they cause. AI viruses can be classified into low pathogenic and highly pathogenic based on the severity of the illness they cause in birds.

  • Low Pathogenic Avian Influenza (LPAI): Most AI strains are classified as LPAI and cause few clinical signs in infected birds. Birds with LPAI may appear healthy and without signs of sickness. However, LPAI can cause mild clinical signs, such as slight facial swelling and some respiratory symptoms. LPAI is monitored because two strains of LPAI—the H5 and H7 strains—can mutate into highly pathogenic forms.
  • Highly Pathogenic Avian Influenza (HPAI): This is a very infectious and fatal form of the disease that, once established, can spread rapidly from bird to bird or flock to flock. One gram (approximately one fourth of a sugar packet) of contaminated manure can contain enough virus to infect 1 million birds. HPAI typically causes severe illness with high death losses.

How AI Is Spread: AI viruses spread primarily by direct contact between healthy and infected birds through respiratory secretions and feces. The disease can spread through:

  • Exposure of poultry to wild waterfowl
  • Illegal international movement of birds
  • Movement of people and farm equipment
  • Smuggling of poultry and poultry products
  • Contaminated poultry equipment (such as cages and crates, manure, vehicles, and egg flats) and people whose clothing or shoes have come into contact with the virus
  • Direct bird-to-bird contact

Survival Period of the AI Virus: HPAI viruses can remain viable at moderate temperatures for several weeks in the environment and can survive indefinitely in frozen material. The virus can be killed by dehydration or sunlight.

Clinical signs of HPAI:

  • Sudden death without clinical signs
  • Lack of energy and appetite
  • Decreased egg production and/or soft-shelled or misshapen eggs
  • Swelling of the head, eyelids, comb, wattles, and legs
  • Purple discoloration of the wattles, combs, and legs
  • Nasal discharge, coughing, and sneezing
  • Lack of coordination
  • Diarrhea

Prevention of AI:

  • House poultry indoors
  • Avoid the use of farm ponds and bird feeders
  • Avoid all contact with wild and domestic waterfowl
  • Avoid live bird markets
  • Control cats, rodents, beetles, insects, and other pests
  • Seek diagnostic help on unusual deaths
  • Avoid contact with your flock if working in poultry or swine processing
  • Try to avoid sharing equipment
  • If you share or borrow equipment, thoroughly clean and disinfect
Exotic Newcastle Disease

Exotic Newcastle Disease (END) is a contagious and fatal viral disease that affects all bird species. It is one of the most infectious poultry diseases in the world. END is so deadly that many birds die without showing any signs of disease. In un-vaccinated poultry flocks, a death rate of almost 100 percent can occur, and END can cause death even in vaccinated poultry. Poultry hobbyists and owners of pet birds should be especially careful because birds illegally smuggled into the United States are not quarantined and tested by U.S. Department of Agriculture and, therefore, may carry the END virus.

How END Spreads:

  • Primarily through direct contact between healthy birds and the bodily discharges of infected birds
  • Rapidly among birds kept in confinement, such as commercially raised chickens and turkeys
  • Through exposure to virus-bearing material picked up on shoes, clothing, equipment, and vehicles

Survival Period of the END Virus:The virus that causes END can survive in a warm and humid environment for several weeks. This environment could be birds’ feathers, manure, and other materials. Frozen, the virus can survive for extremely long periods. However, it is destroyed quickly by dehydration or sunlight.

Clinical Signs of END

  • Sneezing, gasping for air, nasal discharge, coughing
  • Greenish, watery diarrhea
  • Depression, muscular tremors, drooping wings, twisting of head and neck, circling, and paralysis
  • Partial to complete drop in egg production
  • Production of thin-shelled eggs
  • Swelling of tissues around the eyes and in the neck
  • Sudden death and a high death rate in infected flock

Prevention of END: Prevention of END can be done through sound vaccination programs and practicing biosecurity. Also, avoid contact with pet birds that belong to others, game fowl and live bird markets.

Pullorum-Typhoid Disease

Pullorum-Typhoid (PT) bacteria are host-adapted, with all types of fowl being vulnerable to infection. Turkeys, for instance, are very prone to the disease. For them a serum test must be used, because research has shown this is the most effective test for these particular birds. Chickens are especially susceptible to pullorum-typhoid disease. Both hens and roosters can carry the bacteria, oftentimes doing so without showing any outward sign of infection. Occasionally, though, an adult bird’s joints may show signs of swelling, which is an indicator of possible pullorum-typhoid contamination.

How PT Spreads:

  • Primarily transmitted from hen to young hatchlings directly through the egg
  • Often localized in the reproductive organs of a diseased female
  • Can also be transmitted through the digestive and respiratory secretions of infected birds

Survival Period of PT: Pullorum-typhoid bacteria can live in birds or eggs for more than a few weeks in the appropriate temperatures. The bacteria can be inactivated in extreme freezing temperatures and killed in extreme heat.


Clinical Signs of PT:

  • signs of swelling in joints of adult birds
  • Severe lesions on many of the internal organs
  • White pasty excrement (the disease was originally called bacillary white diarrhea)
  • Physical appearance of chicks and poults (drowsiness, lack of appetite, drooping wing, labored breathing, swelling in joints, and a stunted or distorted body appearance)
  • High death rate in the first three weeks after hatching, sometimes approaching 100 percent of the brood

Common Chicken Diseases Every Chicken Keeper Should Know About (and How to Treat Them)

Do you consider yourself a chicken person?

Well, I was not when my husband decided we should begin raising them. You can imagine how I felt when he told me he was going to get our first chickens.

For starters, I knew nothing about chickens.

However, I quickly changed my mind as we became more self-sufficient.

Part of raising chickens is understanding how to recognize and treat some of their common illnesses. Today, that is what I’m bringing you.

Let’s get started…

1. Fowl Pox

If you notice your chickens developing white spots on their skin, scabby sores on their combs, white ulcers in their mouth or trachea, and their laying stops then you should grow concerned that your chickens are developing Fowl Pox.

There are treatment options for Fowl Pox. You can feed them soft food and give them a warm and dry place to try and recoup. With adequate care, there is a great chance that your birds can survive this illness.

If you would like to remove the odds of your birds even contracting this disease there is a vaccine available. If not, you should know that they can contact this disease from other contaminated chickens, mosquitos, and it is a virus so it can be contracted by air as well.

2. Botulism

If your chickens begin to have progressing tremors you should grow concerned. If your chickens have botulism the tremors will progress into total body paralysis which does include their breathing.

It is a serious disease.

You will also notice their feathers will be easy to pull out and death usually occurs within a few hours.

However, what can you do about it?

Well, there is an antitoxin that can be purchased from your local vet. Though it is considered to be expensive. However, if you catch the disease early enough you can mix 1 teaspoon of Epsom salts with 1-ounce of warm water. You can give it to them by dropper once daily.

If your chickens have contracted this disease it means that there has been some type of dead meat left near their food and water which contaminated it. Which means this disease is avoidable as long as you keep your chickens in a clean environment and clean up any dead carcass from around their environment.

3. Fowl Cholera

You should be suspicious of this disease if you see your birds begin to have greenish or yellowish diarrhea, are having obvious joint pain, struggling to breathe, and have a darkened head or wattle. Fowl Cholera is a bacterial disease that can be contracted from wild animals or food and water that has been contaminated by this bacteria.

However, the biggest downside to your chicken developing this disease is there is no real treatment. If by some chance your chicken survives, it will still always be a carrier of the disease.

It is usually better to put them down and destroy their carcass so it will not be passed.

However, there is a vaccine for your chickens to prevent the disease from ever taking hold.

4. Infectious Bronchitis

This disease hits close to home because it wiped out half of our flock when we were new to raising chickens. You’ll recognize this disease when you begin to hear your chickens sneezing, snoring, and coughing. And then the drainage will begin to secrete from their nose and eyes.

Their laying will cease too.

Even so, the good news is you can get a vaccine to stop this disease from impacting your chickens.

However, if you decide against that then you will need to move quickly when seeing these signs. Infectious Bronchitis is a viral disease and will travel quickly through the air.

To treat Infectious Bronchitis, give your chickens a warm, dry place to recoup. I gave my birds a warm herb tea and fed them fresh herbs, which seemed to help.

5. Infectious Coryza

You will know that your birds have caught this disease when their heads become swollen. Their eyes will swell shut and their combs will also swell. Then the discharge will begin to flow from their eyes and noses. They will stop laying and will have moisture under their wings.

Unfortunately, there is no vaccine to stop this disease.

Once your chickens contract this disease they should be put down. If not, they will remain a carrier of the disease for life which is a risk to the rest of your flock.

Be sure to discard the body afterward so no other animal becomes infected by it.

However, the light at the end of this tunnel is that even though this disease is a bacteria it only travels through contaminated water, other contaminated birds, and surfaces that have been contaminated with the bacteria.

6. Marek’s Disease

This disease is more common in younger birds that are usually under the age of 20 weeks.

You will know that this disease has struck your baby chicks if you begin to see tumors growing inside or outside of your chick. Their iris will turn gray and they will no longer respond to light. And they will become paralyzed.

Unfortunately, this disease is very easy for them to catch. It is a virus which means it is super easy to transmit from bird to bird. They actually get the virus by breathing in pieces of shed skin and feather from an infected chick.

And sadly, if your chick gets this disease it needs to be put down. It will remain a carrier of the disease for life if it survives.

However, the good news is there is a vaccine and it is usually given to day-old chicks.

7. Thrush

Thrush in chickens is very similar to thrush that babies get.

You’ll notice a white oozy substance inside their crop (which is a space between their neck and body.) They will have a larger than normal appetite. The chicken will appear lethargic and have a crusty vent area. And their feathers will look ruffled.

It is important to mention that thrush is a fungal disease. This means it can be contracted if you allow your chickens to eat molded feed or other molded food. And they can also contract the disease from contaminated water or surfaces.

Even though there is no vaccine, it can be treated by an anti-fungal medicine that you can get from your local vet. Be sure to remove the bad food and clean their water container as well.

8. Air Sac Disease

This disease first appears in the form of poor laying skills and a weak chicken. As it progresses, you will notice coughing, sneezing, breathing problems, swollen joints, and possibly death.

Now, there is a vaccine for this illness, and it can be treated with an antibiotic from the vet. However, it can be picked up from other birds (even wild birds) and it can be transferred from a hen that has it to her chick through the egg.

As a precaution, keep an eye out for any of these symptoms so it can be treated quickly and effectively.

9. Newcastle Disease

This disease also appears through the respiratory system. You will begin to see breathing problems, discharge from their nose, their eyes will begin to look murky, and their laying will stop. Also, it is common that the bird’s legs and wings will become paralyzed as well as their necks twisted.

This disease is carried by other birds including wild birds. That is how it is usually contracted. However, if you touch an infected bird you can pass it on from your clothes, shoes, and other items.

Still, the good news is that older birds usually will recover and they are not carriers afterward, but most baby birds will die from the disease.

There is a vaccine for the disease although the US is working to rid the country of the disease all the way around.

10. Mushy Chick

This disease obviously will impact chicks. It usually shows up in newly hatched chicks that have a midsection that is enlarged, inflamed, and blue-tinted. The chick will have an unpleasant scent and will appear to be drowsy. Naturally, the chick will also be weak.

This disease doesn’t have a vaccine. It is usually transmitted from chick to chick or from a dirty surface where an infected chick was. And usually, it is contracted from an unclean area where a chick with a weak immune system contracts the bacteria.

There is no vaccine for this disease, although sometimes antibiotics will work. However, usually, when you come in contact with this disease you will need to immediately separate your healthy chicks from the sick ones.

Use caution as the bacteria within this disease (such as staph and strep) can impact humans.

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