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Mareks sjukdom – Wikipedia

Specifically, it is a type of alpha herpesvirus, and more specifically it is a DNA virus. Marek's cannot be transmitted vertically. This means that a mother hen cannot pass Marek's on through the egg to her chick. Marek’s disease is one of the most common diseases we see in a small multi-age unvaccinated flocks. The disease presents typically between 12 and 20 weeks of age and it is usually fatal. The control of the disease is difficult so you need a good understanding of the basic principles in order to reduce the chance of your birds becoming infected.

There are four different strains of Marek’s disease - two strains affect chickens, one doesn’t cause illness, and the last only affects turkeys. The strains that affect chickens can have the following effects: Marek’s disease virus (MDV) infects poultry. It is a member of the Herpesviridae family, in the genus Mardivirus and it can be divided into pathotypes that are dependent on virulence: mild (m), virulent (v), very virulent (vv), and very virulent plus (vv+). MDV is enveloped, with a capsid and a double stranded DNA genome.

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Basically, this means it causes the growth of tumors inside the chicken’s body. It is caused by a virus species called Gallid alphaherpesvirus 2 (for those who are curious). A herpes-type that is very communicable.

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Transmission. Marek's is highly contagious and spreads by bird-to- Marek's Disease (MD) is a common, highly contagious tumor-causing viral infection which affects chickens and sometimes turkeys, worldwide.

Affected birds lose weight, become emaciated, and die. Marek's Disease affected eye (picture on left) Liver tumors seen with Marek's Disease.
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Mareks sjukdomsvaccin. 2019.
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Marek’s disease is often described as a virally induced cancer. It is caused by a virus and there is no known cure for the disease. While some birds survive the vast majority sadly succumb to the disease.

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Visceral type with tumours in various internal organs usually occurs between 16-35 weeks. Infection takes place at very young age, but birds can die of Marek's disease (MD) near the onset of egg production. Marek’s disease is one of the most common diseases we see in a small multi-age unvaccinated flocks. The disease presents typically between 12 and 20 weeks of age and it is usually fatal. The control of the disease is difficult so you need a good understanding of the basic principles in order to reduce the chance of your birds becoming infected. Marek’s disease is highly contagious amongst chicken flocks and is caused by the herpesvirus. There is no cure and it brings a high mortality rate.

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This disease is worldwide and most if not all chickens have been exposed to it even if they do not show symptoms of the virus. It is caused by 6 different herpes viruses which affect very young birds. Marek’s Disease must be differentiated between Avian Leukosis Complex, which is made up of three separate diseases.

Although there is a vaccine available which is relatively effective against clinical 2020-10-16 Marek’s disease is an unfortunate disease that plagues the chicken world but is much more in the rarity spectrum for parrots.