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Disease outbreak in finches Since summer 2005, a disease caused by a Trichomonas parasite has been seen in finch species. As far as I am aware, this is the first time that this has occurred. Whilst greenfinches and chaffinches are the species that have been most frequently affected, other finch species and house sparrows are susceptible to the disease. An increase in the number of reported disease outbreaks in finches thought to be caused by trichomonas has occurred during and following the recent spell of hot weather in July 2006. Formerly, this disease was known from doves, some raptors and gamebirds. In addition to showing signs of general illness, for example lethargy and fluffed-up plumage, affected birds may drool saliva, regurgitate food, have difficulty in swallowing or show laboured breathing. Finches are frequently seen to have matted wet plumage around the face and beak. In some cases, swelling of the neck may be visible from a distance. The disease may progress over several days or even weeks, consequently affected birds are often emaciated. Trichomonas is vulnerable to desiccation and cannot survive for long periods outside the host. Transmission of infection between birds is most likely to be by birds feeding one another with regurgitated food during the breeding season; through food or drinking water contaminated with recently regurgitated saliva, or possibly, from droppings of an infected bird. Where a problem with trichomoniasis exists, general measures for control of disease in wild bird populations should be taken: Ensure optimal hygiene at garden bird feeding stations, including disinfection. Consider leaving bird baths with standing water empty for a short period, allowing them to dry out completely before refilling. Otherwise, be particularly vigilant to provide clean drinking water on a daily basis. It is advisable to continue feeding. If this is stopped birds will be forced to seek out food from elsewhere, perhaps at a feeding station where optimal hygiene isn't practiced. Good hygiene practice, specifically the regular cleaning of all feeders, bird baths and feeding surfaces, is an essential part of looking after garden birds. Click here to download a factsheet on the disease. Click here to find out more about hygiene measures. Click here to find out more about the Garden Bird Health initiative.
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