The advice hub Fowl Pox

Whilst Fowl Pox is not necessarily life threatening, it is a very painful condition and one that is hard to remove from a holding.


Fowl pox is caused by a pox virus and mostly affects chickens. There is also a pigeon pox virus and a turkey pox virus.

There are three possible ways in which the virus can be spread:

  • Commonly, the virus is shed from fowl pox wounds on affected birds and enters its next victim through skin wounds. Normal healthy skin will act as an effective barrier to fowl pox virus.
  • Biting insects can carry the virus from one bird to another.
  • Pox viruses that infect mammals can be spread through the air, therefore it is likely this is how fowl pox also spreads.

Once in the skin, the virus reproduces to cause ‘pocks’. These start off as raised areas which burst, releasing a tiny amount of pus to leave scab-like crusted raised areas, which are often brownish colour. These wounds are mostly seen on featherless skin such as the legs, comb, eye lids and wattles. This is called the ‘dry form’ of Fowl pox which causes mild irritation. These birds may stop laying and lose weight. In severe cases if the eye lids are affected the birds can find it hard to open their eyes. Birds with the ‘dry form’ rarely die. After about 14 days the pocks heal but can sometimes leave a tiny scar.

Much more rarely, the virus can infect the mouth, the oesophagus (food pipe) and the trachea (windpipe) initially to form white lumps in these areas, but subsequently these areas join together to create a layer of mucus, pus and dead cells from the mouth lining. This is called the’ wet form’. This mucus/pus/dead cell can obstruct the trachea (windpipe) making it difficult for the birds to breathe (in severe cases, choking the bird) and it can be very painful making it hard for the bird to eat. Birds with the ‘wet form’, if severe enough, can die.


There is no specific treatment for fowl pox but it is worth taking them to your vet, if the ‘wet form’ presents itself as they may prescribe antibiotics to prevent secondary bacteria making the problem worse. If your bird is restless and not eating as much food as normal it is worth giving them Chicken Vet Multivitamins to compensate for their reduced appetite. Birds may find it very painful to eat but may find it less painful to drink; therefore supplements in the water will be beneficial.

Always have a close look at any birds before you buy them so you don’t bring pox onto your site. Conditions such as fowl pox can take a few days or even weeks to present themselves following infection, so it is recommended to quarantine your chickens for three weeks after making a purchase.

Control red mites, northern fowl mite and lice to reduce further spread of fowl pox. Chicken Vet has a wide range of insect control products.

As with all diseases improving overall hygiene and keeping the birds as stress free as possible will help. Fowl pox virus is very resistant and can survive in the environment for years. Always ensure that you use an approved disinfectant such as Interkokask. The concentrated version is DEFRA approved to kill bacteria, viruses, fungi, coccidiosis, worm eggs and red mite at the correct dilutions and application.

To prevent fowl pox there is currently no licensed vaccine in the UK.  You can discuss the possibility of using the pigeon pox vaccine with your vet.