Numerous diseases are carried or caused by birds, from both their bodies and their droppings. Conditions caused by the fungal spores in the bird guano include 'pigeon fancier's lung' (extrinsic alveolitis), and ornithosis. Disease-causing organisms carried by the birds and passed in their droppings or via their feeding on human foodstuffs include Salmonella spp., Escherichia coli, Cryptococcus spp., Chlamydia psittaci and Listeria spp., for example.
Operators working in areas where they are at risk should wear full coveralls, respirators with dust fillers (P1,P2,P3) and gloves. The application of an appropriate disinfectant, such as PX-Ornikill, during work should also be considered.

Psittacosis
Is the rarer more serious strain being closer to atypical pneumonia. This is also associated with birds from the parrot family.
Cryptococosis
This is a very serious illness. I begins as a lung infection but can progress to the brain causing meningitis.

Campylobactor
Caused by the contamination of food sources, usually by birds that have been infected by contaminated foodstuffs. This can result in extreme forms of gastro-enteritis.
Salmonellosis
This is present in upwards of 90% of feral pigeons and slightly less percentages in the starling population. Anyone handling feral birds or being in close proximity to their surroundings should exercise maximum hygiene practices.

Extrinsic Allergic Alveolitis
commonly know as bird fanciers lung. Caused by inhalation of dust from the birds and can be remedied by the total removal of the birds and associated debris.
Erysipelas
Serious wound infection caused by transmission of streptococcus pyogenes found in bird fouling and debris, which enter minor wounds.

Escherichia Coli
Contracted orally by ingesting contaminated food or water. The incidence is clearly related to hygiene, food processing, general sanitation and the opportunity for contact. Recent research at Lancaster Univercity has linked its spread to gulls.
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