Chimpanzee Medicine in the Republic of Congo

During the summer leading up to my third year of veterinary school, I worked with the Jane Goodall Institute (JGI) in the Republic of Congo. As part of the college’s commitment to wildlife health and international medicine, Cornell has established a partnership with JGI through the Engaged Cornell Program. Engaged Cornell gives veterinary and undergraduate students the opportunity to apply concepts learned in the classroom to field sites in developing nations across the globe. Students can elect to take an on-campus course during the spring term and apply for the opportunity to continue their studies abroad during the summer. Upon return, they take a follow-up course in the style of a seminar series, to share their work with faculty and peers, and to learn about their classmates’ experiences. Thanks to Engaged Cornell, I was able to work at Africa’s largest chimpanzee sanctuary alongside one of the world’s leading experts in the field, Dr. Rebeca Atencia.

Tchimpounga Chimpanzee Rehabilitation Center is currently home to over 130 chimpanzees, most of which fell victim to the illegal bush meat and pet trades early on in life. Through the efforts of Dr. Atencia and her team of nurses and caregivers, these animals are being given a second chance. JGI is currently working to prepare a number of these chimpanzees for release back into the forest, where they will have the opportunity to live as wild apes once again. Before that can happen, however, they need to be both physically and psychologically fit to survive the harsh realities of life in the rainforest. My efforts this summer were put towards ensuring the capability of these chimps to thrive outside of the confines of the sanctuary.

Some of my time in Congo was spent performing routine “health checks,” or comprehensive physical exams, on animals under the care of JGI. I participated in the anesthesia, general examination, cardiac evaluation, and abdominal ultrasonography of over thirty chimpanzees. I learned basic skills such as taking blood pressure measurements, giving injections, and drawing blood, and more advanced skills such as abdominal ultrasound, echocardiography, and designing anesthesia regimes. I gained invaluable hands-on veterinary experience that I truly could not have gotten anywhere else.

Melissa Hanson describes the results of a chimpanzee electrocardiogram at the Tropical Biology and Conservation Symposium, October 2017.

In addition to medicine, I spent much of my time analyzing behavior and social interactions of the chimpanzees. I became versed in their verbal and non-verbal language, watched alliances form, and saw individuals rise to power and dominance within their community. A chimpanzee’s well-being relies heavily on its sense of security in its social group, and the health of a chimpanzee community depends on the degree of harmony amongst its members. The knowledge base I formed through careful observation was pivotal for my participation in data collection during the integration of new chimpanzees into established social groups. During an integration, JGI caregivers and veterinarians carefully record behaviors, to ascertain whether a chimp will be accepted by its conspecifics or not. Things happen very fast, so it is imperative that observers be well-acquainted with the chimps’ social cues. In time, I was confident enough with my skills to participate in this data collection, and even had the chance to make recommendations as to which individuals to introduce to the group.

My experience did not stop there, however. While in Congo, I also had the chance to work with a variety of unique native species, such as Mandrills, a Tree Pangolin, and African Grey Parrots. During time spent with JGI’s education and public health teams, I visited local villages to discuss conservation and sustainable agriculture with their people, as well as provide parasite preventatives for their pets. I also gained a lot of experience in the laboratory analyzing blood and fecal samples and screening for infectious disease among the chimps. Additionally, I participated in several ongoing research projects at Tchimpounga and even could explore some of my own interests and questions. One endeavor I am most proud of contributing to is the establishment of a preliminary body condition score (BCS) system for chimpanzees that will allow caregivers to monitor nutrition and well-being in a non-invasive manner. Hopefully, this scoring scheme will be used when the chimpanzees are being evaluated for their success in the forest after their release.

I am incredibly fortunate to have experienced all that I did this summer, and cannot thank the partners of JGI or Engaged Cornell enough for allowing me to pursue some of my greatest aspirations while still in veterinary school. Participating in chimpanzee medicine and rehabilitation allowed me to be a part of something much bigger than myself and to learn about a species with which I had never worked, but had always dreamed of. My time in Congo made me a better student, a better person, and will undoubtedly make me a better veterinarian in the years to come.


ABOUT THE AUTHOR

Melissa is a third-year veterinary student from Cortlandt Manor, New York. She received her Bachelor of Science degree from Duquesne University where she majored in biology and minored in biochemistry and history. Her interests are in clinical zoo and wildlife medicine and particularly rescue, rehabilitation, and release. She works as student technician at the Janet L. Swanson Wildlife Health Center, a service of the Cornell University Hospital for Animals.

The Price of Freedom: How our Choice to use Lead is Killing the Bald Eagle (Part 2)

This post was originally published at Science@CornellVet on August 2, 2017 by Melissa Hanson, third year Cornell DVM student.  


juvenile bald eagle

A juvenile bald eagle receives treatment at the Janet L. Swanson Wildlife Health Center

Last week offered a glimpse into the work the Animal Health Diagnostic Center and Wildlife Health Team has done to quantify the impact of lead on our native wildlife, but what does the story look like from the perspective of Cornell’s clinicians? Dr. Sara Childs-Sanford, a veterinarian at the Janet L. Swanson’s Wildlife Health Center, a clinical service of the Cornell University Hospital for Animals (CUHA), shared her experience treating local wildlife directly impacted by the toxic element.

“A typical patient presenting with lead toxicity is a raptor species (bird of prey) or waterfowl. These animals are weak, and often have neurologic signs and ileus (failure of food to pass through the digestive tract),” says Childs-Sanford. “Concerned members of the public usually bring the animal to CUHA after observing it unable to fly or walk.”

She explains that the primary treatment of these animals involves supportive care for dehydration and emaciation, and a blood draw to screen for serum lead values. Her team uses an in-house lead analyzer is to detect lead concentration in the blood, giving them a rapid answer regarding lead toxicity in a patient.

With the help of the analyzer, virtually every raptor or waterfowl species patient that comes through the door is screened for lead toxicity, allowing treatment to begin immediately. To target the lead, the Wildlife Health Center team uses chelation therapy, which involves the introduction of compounds that bind lead and thus allow it to be excreted by the patient. Chelation therapy is completed in five day increments for a minimum of two weeks, but many patients need to remain under the care of Childs-Sanford’s team or a wildlife rehabilitator for much longer.

What harm can a little lead do? When ingested by an animal, lead is absorbed through the blood stream where it disrupts heme synthesis, a process required for oxygen delivery. The toxin is then distributed throughout the body where it deposits in soft tissue, organs, and bone, degenerating nerves and interrupting signaling pathways necessary for neurologic and gastrointestinal function. The prognosis for patients is widely variable and dependent upon the levels of lead detected, the organ systems affected, and most importantly, how long the toxicity has been present. In general, acutely affected animals carry a better prognosis than those with chronic exposure. Unfortunately, for waterfowl and piscivorous raptors, continually eating from a contaminated body of water often results in the latter.

radiograph of a common loon with a lead sinker in its digestive tract

Radiograph of a common loon with a lead sinker visible in the digestive tract

So, what can you do to help? For Childs-Sanford, part of the solution is clear: don’t use lead bullets or sinkers, and don’t cut fishing lines into the water. “Lead in the wild comes from people,” she stated, noting that its inexpensiveness and the lack of public awareness of its effects are likely to blame for its continued use. While the Wildlife Health Center is capable of treating animals on an individual basis, the true answer to the lead problem lies in addressing its source—us. Increased education for hunters and fishermen is vital, and eliminating the use of lead materials in our environment is the only way to save our wildlife from its devastating effects. Until then, Childs-Sanford and her team will take it one patient at a time.

ABOUT THE AUTHOR

Melissa is a third-year veterinary student from Cortlandt Manor, New York. She received her Bachelor of Science degree from Duquesne University where she majored in biology and minored in biochemistry and history. Her interests are in clinical zoo and wildlife medicine and particularly rescue, rehabilitation, and release. She works as student technician at the Janet L. Swanson Wildlife Health Center, a service of the Cornell University Hospital for Animals.

The Price of Freedom: How our choice to use lead is killing the bald eagle (Part 1)

This post was originally published at Science@CornellVet on July 27, 2017 by Melissa Hanson, third year Cornell DVM student.


bald eagle

Photo credit: Animal Health Diagnostic Center

The bald eagle is an American icon, a symbol of freedom, and for conservationists, one of the nation’s greatest success stories. Restored from near extinction, the species has been thriving once again—or so we thought. As it turns out, mankind may be placing unnecessary pressure on America’s best known bird.

Cornell University’s Animal Health Diagnostic Center (AHDC) employs some of the brightest minds in ecology and wildlife health. Dr. Krysten Schuler, a wildlife disease ecologist, has been leading the research effort exploring the role environmental lead plays in bald eagle health. Schuler partnered with the New York State Dept. of Environmental Conservation to analyze two decades’ worth of data collected from New York State to identify sources of mortality. Their results are disturbing: 17% of bald eagle carcasses examined revealed death due to lead poisoning, and 80% had measurable lead levels in their blood, tissues, or bone. Schuler reports that adult eagles are more likely to die from lead poisoning than juveniles, posing a serious threat to the reproductive success of the species because adults nest and rear young.

Where is all this lead coming from? A likely significant source is ammunition. Lead bullets are commonly and traditionally used for game hunting, which can leave trace levels in meat as well as in the environment. When carcasses or offal are left on the landscape, eagles will scavenge from them, consuming lead bullet fragments. Lead is toxic to all animals, including humans, and eating venison shot with lead bullets may pose a risk to consumers. Schuler explains that the bullet fragments when it hits its target, and small shards can travel more than a foot from the wound channel where they are less likely to be removed during the butchering process. Pregnant women and children are particularly sensitive to the toxic effects of lead, as developing tissues are vulnerable and easily damaged by the toxin.

So, how can we protect our families and our wildlife? Consider alternative ammunition. Modern non-lead bullets are inexpensive and do not foul firearms, as was once widely believed in the hunting community. These alternatives are safe and effective, and when combined with proper hunting etiquette, such as recovering carcasses and properly disposing of entrails, can make a real impact in the levels of lead present in the environment. Even recreational shooting with lead contaminates the environment, and participants should also consider alternatives. Lead bullets may be traditional, but they are also replaceable.

While 80% of bald eagles with measurable lead is a startling figure on its own, it is important to recognize that this species serves only as a snapshot of the entire picture. Lead is toxic to all wildlife and humans, and shared sources of food are the common denominator. “This is a problem that is both man-made and solvable,” says Schuler, emphasizing that humans have introduced lead into the environment and therefore hold the responsibility of removing it as well. Research conducted by the AHDC brings to light the severity of lead toxicity in New York State, exposing it as a true threat to wildlife health where it otherwise may have persisted as a silent killer. Schuler adds, “Just because we don’t see piles of dead eagles doesn’t mean it’s not a problem.” Thanks to her contribution, both problem and solution are now quite clear.


ABOUT THE AUTHOR

Melissa is a third-year veterinary student from Cortlandt Manor, New York. She received her Bachelor of Science degree from Duquesne University where she majored in biology and minored in biochemistry and history. Her interests are in clinical zoo and wildlife medicine and particularly rescue, rehabilitation, and release. She works as student technician at the Janet L. Swanson Wildlife Health Center, a service of the Cornell University Hospital for Animals.