The general public’s affection toward birds translates into a serious underestimation of the health risks associated with pest birds. People who would never tolerate a colony of rats living in their attic will turn a blind eye towards pigeons entrenched in the rafters of their roof. Yet, in terms of disease and damage, the two pests are quite similar. In order to better understand how nuisance birds (or rats for that matter) spread disease we need to understand the basics of disease and transmission.
What is a Disease?
When normal body functions become disrupted due to a foreign invader or an internal malfunction, we call the disruption a disease. Diseases caused by foreign invaders are called infectious diseases. The invading agents that account for the majority of infectious diseases are grouped in the following five categories; viruses, bacteria, mycotic (fungal), protozoal and rickettsial. From a layman’s standpoint, the classification and definitions of disease are less important than how these diseases spread and how can we protect ourselves from them. Diseases need to be transported from place to place in order to spread. Birds are a perfect mechanism for spreading disease because they travel great distances, harbour over forty types of parasites and can host internally over sixty types of infectious diseases.
Fortunately, human interaction with most bird species is minimal, thus drastically reducing any health threat from most birds. However a few bird species have successfully adapted to our urban environment. The pigeon, starling and house sparrow have learned to succeed living in our buildings and eating our food. Their adaptation to our communities has brought them into close proximity to humans. These three non-native birds have become a major nuisance in our cities and they pose a serious health risk.
How Pest Birds Harbour and Spread Disease
The five types of infectious agents listed above can be associated with birds in the following ways: the disease lives in the bird and is passed on when the bird defecates; the disease lives in the birds surrounding environment and is spread by the birds lifestyle; the disease lives inside a parasite that the bird harbours. From understanding how the bird harbours diseases we can demonstrate the four ways the diseases are passed by the bird to humans.
Food & Water Contaminated with Faeces
The most obvious example is when the diseased bird directly defecates into a human food or water source. In the summer of 93, New York faced a health crisis when several hundred people came down with a mysterious ailment. The illness was traced to sea gull droppings in an old city reservoir. Health inspectors are quick to shut down a food processing plant if nuisance birds are found inside. Besides direct contamination, airborne spores from drying faeces in air ducts and vents can settle on exposed food and transfer disease. Several thousand cases of food poisoning (Salmonella) every year are attributed to this disease transmission route.
Inhalation of faecal dust
As bird faeces and/or the contaminated soil it rests on, dries or is disturbed, microscopic pieces break off and become airborne. These airborne particles can contain dormant fungi and/or bacteria. When breathed into the lungs, the warm, moist environment of the lung lining provides a breeding ground for the infectious agents. Common symptoms of this type of infection are flu like in nature: coughing, elevated temperature, restricted breathing and general body fatigue, and last roughly two to four days. The vast majority of the time, the body’s defences will contain the invaders even before minor symptoms appear but in a small percentage of cases, major infection causing long term disability and even death occurs. It is worth noting that there is no known medical cure for internal fungal infections. After the Northridge earthquake, several thousand people came down with flu like respiratory symptoms. The ailment was called Valley Fever and was caused by people breathing in dust and airborne debris filled with histoplasmosis spores and related fungal agents stirred up by the earthquake.
Direct contact with faeces
Infection occurs when a worker or resident gets faecal dust or droppings in an open wound or cut. This commonly occurs when handling old rusty, sharp porcupine wire ledge products which are covered with bird faeces. The wound site becomes red, puffy and puss-filled. Antibiotics are often needed to cure the infection. In some rare cases, infection of the blood (Septis) or internal infection can also occur causing serious illness or death. Proper attire and care must always be used when cleaning a bird site or installing bird control products. If a cut or injury occurs, thoroughly wash and disinfect the wound and cover with a sterile bandage to minimize risk of infection.
Pest birds harbour ticks, fleas, mites and other ectoparasites. Parasites transfer disease in the following manner. The parasite bites an infected animal and sucks in blood containing the germ. When the bug bites its next victim it passes along the germ to the new victim. This occurs because parasites inject some of their saliva into the host when feeding. Over forty types of parasites live either on the birds, in their nests or in the places they roost. They are responsible for the transmission of several hundred viral and bacterial agents. These diseases include plague, encephalitis, pox and meningitis. Control of these parasites is a crucial phase of the bird control project. Paradoxically, this threat can be aggravated when bird control products are installed. Unless the parasites are exterminated when the birds are excluded from a site, the mites, fleas, ticks etc. will seek a new host, often the human inhabitants. Therefore, a proper bird control project will always include parasite extermination.
How to Handle Pest Birds Problems From A Health Perspective
Using our understanding of how nuisance birds play a roll in disease transmission, we can develop a few guidelines when dealing with bird infestations.
First and foremost, bird infestations are to be taken seriously but not irrationally. When evaluating a health risk potential look for the following: droppings or nesting materials inside air vents, birds around food or beverage production facilities, or large amounts of droppings in enclosed areas. These are the types of situations where disease can be spread. Remember, pigeons walking around your park bench are not cause for panic, while twenty birds living in the roof-top air ducts of a restaurant is a serious health concern requiring action.
Second, pest control professionals and D.I.Y consumers must take the proper precautions when tackling bird control projects. Respirators, goggles and protective clothing must be used when cleaning up bird sites, particularly enclosed areas out of the sun with large amounts of droppings and nesting material (please see our separate information sheet on protective safety equipment).
Finally, it is not enough to remove the birds, it is crucial to exterminate all the ectoparasites and thoroughly disinfect the site. Please refer to our page on bird waste cleanup for more information.
The Importance of Cleaning a Bird Site
Site cleanup is something that should be done, to some extent, on every bird job for many different reasons.
Damage Bird droppings are very acidic and can cause damage to structures and machinery if they remain for extended periods of time. Cleaning a nesting site can also remove existing bird-related odors, reducing the birds’ desire to return.
Worker Safety & Ease of Installation
Working around droppings is unsanitary. It is also difficult for adhesives to adhere to a dirty surface.
Liability & Disease Potential
Bacteria and parasites from droppings & nesting materials remaining at the site are an even greater threat to building occupants as they will look for a new host after the birds are forced out. Many businesses must also be concerned with meeting federal, state and local cleanliness requirements.
Installing bird control products on a dropping-splattered area gives the impression that you don’t care about the way the building looks, didn’t do the job correctly or used ineffective products – otherwise why would there still be droppings around?
Evaluate the situation carefully before cleaning a bird site. Some sites are much easier to clean than others. Cleanup of smaller amounts of droppings in open areas may be accomplished by simply hosing, scrubbing or pressure washing the area.
For more serious accumulations, you should follow these steps:
1) Bag and remove loose layers of droppings. (Be sure to wear protective coveralls, gloves and respiratory equipment when cleaning any bird site. Click here for more information on protective equipment). At all sites, debris and other nesting materials should be shoveled into double bagged heavy duty garbage bags and disposed of properly.
2) To remove remaining stubborn droppings, apply Dissolve-It. Mix in 1:1 ratio with water and let the mixture soak into the droppings for at least 15 minutes; droppings will generally wipe easily away with a brush and water (see page 7 for more information on Dissolve-It).
3) Follow with a clean water rinse.
4) After area is clear of droppings, apply Disinfect-It or other hospital grade viricide/ germicide to kill any remaining bacteria.