Malaria protection in chimpanzees

Group of chimpanzees, Taï National Park, Cote d’Ivoire. © Sonja Metzger <br>

Wild great apes are widely infected with malaria parasites. Yet, nothing is known about the biology of these infections in the wild. Using faecal samples collected from wild chimpanzees, an international team of researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig and the Robert Koch Institute in Berlin has now investigated the effect of the animals’ age on malaria parasite detection rates.

The data show a strong association between age and malaria parasite positivity, with significantly lower detection rates in adult chimpanzees. This suggests that, as in humans, individuals reaching adulthood have mounted an effective protective immunity against malaria parasites.

In malaria regions the parasite prevalence in the human body as well as malaria-related morbidity and mortality decrease with age. This reflects the progressive mounting of a protective immunity. Researchers of the Max Planck Institute for Evolutionary Anthropology and the Robert Koch-Institute now present a study which addresses the age distribution of malaria parasite infection in a group of wild chimpanzees.

To this end the researchers collected 141 faecal samples from seven female and 12 male wild chimpanzees from Taï National Park, Cote d’Ivoire. At time of sampling the animals’ ages ranged between 3 and 47 years. The researchers extracted DNA from the faecal samples, analysed it and so identified the malaria parasite-positive samples. “In the course of this 2-month study almost every individual chimpanzee of the group was found positive at least once”, says Hélène De Nys of the Max Planck Institute for Evolutionary Anthropology and the Robert Koch-Institute. “Our data further suggest that at every point in time at least one individual of this chimpanzee group is infected”.

Further analyses showed that malaria parasites were detected more often in younger than in older animals. Whether these were female or male, however, did not make a difference. “This is the first indication that epidemiological characteristics of malaria parasite infection in wild chimpanzee populations might be comparable to those in human populations”, says Roman Wittig of the Max Planck Institute for Evolutionary Anthropology. “As in humans, the development of acquired immunity likely plays an important role in wild chimpanzees as well”.

Throughout this process, malaria parasites might also contribute directly to decimating young chimpanzees. During analyses performed on more than 30 dead adult chimpanzees from the same community malaria could be excluded as the cause of death. For young chimpanzees, however, the question remains open. While it is known that mortality in young chimpanzees is high, their bodies are rarely accessible. This is because they are less likely to be found and because their carcasses are carried for several days by their mothers.

“Even though at this stage, we cannot pinpoint pathogenicity of malaria parasites found in wild chimpanzees, our results suggest a continuous exposure of this population, leading to the development of a certain resistance to infection”, says Fabian Leendertz of the Robert Koch-Institute.

Contact

Dr. Roman Wittig
Max Planck Institute for Evolutionary Anthropology, Leipzig
Phone: +49 341 3550-204
Email: wittig@­eva.mpg.de
Dr. Fabian Leendertz
Robert Koch Institute
Phone: +49 30 18754-2592
Email: LeendertzF@­rki.de
Sandra Jacob
Press and Public Relations
Max Planck Institute for Evolutionary Anthropology, Leipzig
Phone: +49 341 3550-122
Fax: +49 341 3550-119
Email: jacob@­eva.mpg.de

Original publication
Hélène M. De Nys, Sébastien Calvignac-Spencer, Ursula Thiesen, Christophe Boesch, Roman M. Wittig, Roger Mundry & Fabian H. Leendertz
Age-related effects on malaria parasite infection in wild chimpanzees
Biology Letters, 29 May 2013, DOI: http://dx.doi.org/10.1098/rsbl.2012.1160

Media Contact

Dr. Roman Wittig Max-Planck-Institute

All latest news from the category: Life Sciences and Chemistry

Articles and reports from the Life Sciences and chemistry area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Back to home

Comments (0)

Write a comment

Newest articles

New yttrium-hydrogen compounds discovered

Researchers at the University of Bayreuth have made a significant scientific breakthrough by discovering new yttrium-hydrogen compounds having serious implications for the research on high-pressure superconductivity. High-pressure superconductivity refers to…

New AI model detects ninety percent of lymphatic cancer cases

Medical image analysis using AI has developed rapidly in recent years. Now, one of the largest studies to date has been carried out using AI-assisted image analysis of lymphoma, cancer…

UTA preps giant particle detectors for neutrino project

Excavation of caverns part of Fermilab’s Deep Underground Neutrino Experiment. With excavation work complete at the site where four gigantic particle detectors for the international Deep Underground Neutrino Experiment (DUNE) will be…

Partners & Sponsors