APOPO

APOPO is a Belgian-founded humanitarian nongovernmental organization and United States nonprofit known for training African giant pouched rats and technical survey dogs for humanitarian detection work. Its best-known animals are branded HeroRATs and HeroDOGs. The organization developed the use of trained rats as biological scent detectors for landmines and later adapted the same general approach to the detection of tuberculosis in human sputum samples. Its work combines animal training, mine-action operations, public-health partnerships, research and development, and advocacy for communities affected by conflict and disease. The organization began in Belgium in the 1990s as a research and development initiative. Bart Weetjens became interested in the possibility of using rodents as scent detectors after learning about gerbils used in detection work. With support from Mic Billet and rodent specialist Ron Verhagen, the project selected the African giant pouched rat, commonly referred to in APOPO material as the Gambian pouched rat, because of its strong sense of smell, trainability, longevity and suitability for African operating environments. Weetjens and Christophe Cox formally launched the APOPO project on 1 November 1997. Early financial backing came from Belgian development-aid funds, while cooperation with the Sokoine University of Agriculture in Morogoro, Tanzania, eventually became central to breeding, training and research. APOPO's mine-detection model uses reward-based clicker training to teach rats to identify the odor of explosives. The animals are light enough to pass over many mines without triggering them and are trained to indicate a target scent rather than respond to metal contamination, which can make conventional metal detectors inefficient in heavily littered areas. They normally work with human handlers and other demining methods, including mechanical ground preparation and manual clearance. Dogs, mainly Belgian Malinois and Dutch Shepherds, complement the rats by surveying larger or densely vegetated areas. APOPO treats the animals as working partners, providing veterinary care, handlers, structured training and retirement arrangements. The organization achieved a major operational milestone in Mozambique, where its teams supported mine clearance in several provinces and helped the country reach an official mine-free declaration in 2015. It has also conducted or supported mine-action work in Angola and Cambodia. In Cambodia, APOPO worked with the Cambodian Mine Action Centre and Norwegian People's Aid, accrediting rats for operational clearance after a period of acclimatization and training. The group has maintained a public visitor center in Siem Reap to demonstrate its methods. APOPO expanded from mine action into tuberculosis detection in Tanzania in the mid-2000s. Rats screen sputum samples that have already been examined by clinics, allowing suspicious samples to be referred for further testing. The program was later extended to Mozambique and studied in cooperation with national laboratories, universities and health agencies. APOPO has also researched other scent-detection applications, including search and rescue and the identification of illicit wildlife products. Its model is intended to supplement, rather than simply replace, conventional laboratory, medical or mine-clearance technologies. By May 2024, the organization reported more than 450 employees working locally and internationally, with 279 rats and 79 dogs in breeding, training, research or field operations. APOPO's operating headquarters and principal training and research facilities remain in Morogoro, while fundraising and support structures exist in Europe and the United States. The organization is funded through grants, institutional support, partnerships and donations rather than public-market investment.

APOPO emerged from a Belgian research and development effort focused on applying animal olfaction to humanitarian problems. Bart Weetjens became interested in scent-detection rodents and worked with Mic Billet and rodent expert Ron Verhagen to assess whether African giant pouched rats could be trained to locate landmines. The project was formally initiated by Weetjens and Christophe Cox on 1 November 1997. Belgian development-aid support helped finance the early work, and APOPO established cooperation with the Sokoine University of Agriculture in Morogoro, Tanzania. By 2000, Morogoro had become the principal base for breeding, training and research. The first major application was mine detection. APOPO developed a reward-based training system in which rats learned to associate a click with food and then identify explosive odors. The rats indicate a target by stopping and scratching or otherwise signaling to a handler, while their low body weight allows them to work across suspect ground with less risk of setting off pressure-sensitive devices. They are used as part of a broader clearance system that may include mechanical preparation, manual deminers and metal detectors. In 2004, the first group of APOPO rats received accreditation under international mine-action standards. From 2006, the organization participated in long-running clearance operations in Mozambique. APOPO's Mozambique program became its most visible mine-action success. In 2008, it was tasked with clearing Gaza Province, which was declared free of mines in 2012, ahead of the original schedule. The organization later expanded to additional provinces. It supported the clearance of five provinces, and Mozambique announced on 17 September 2015 that it was free of all known landmines. Residual teams and animals remained available for follow-up tasks at the government's request. APOPO also worked in Angola from 2012, supporting Norwegian People's Aid and other clearance activities, and entered Cambodia through cooperation involving the Cambodian Mine Action Centre and Norwegian People's Aid. Cambodian rats underwent acclimatization, local handler preparation and accreditation before beginning operational work. The second major application developed from the same scent-detection principle. A World Bank grant in 2003 helped APOPO investigate whether rats could identify tuberculosis bacteria in sputum samples. A tuberculosis program began in Tanzania in 2007 in partnership with government clinics, and proof-of-principle work was reported in 2008. Rather than functioning as a standalone diagnostic replacement, the rats were used as a screening layer over clinic-tested samples, helping identify specimens that warranted additional examination. Research and implementation planning continued, and the program expanded to Mozambique in 2013. Studies in Zambia and partnerships with national reference laboratories and research institutions were used to assess accuracy and operational effectiveness. Technology and methodology also developed over time. In 2010 APOPO introduced an automated training cage using optical sensors to record animal responses and automatically deliver a click and food reward. The system was intended to make training more consistent and reduce the possibility that human handlers could unintentionally influence results. APOPO later broadened its work to include search and rescue and research into other scent targets, including illegal wildlife products. Dogs were added as complementary technical survey animals, particularly for large or vegetated areas where their size and speed offer advantages over rats. The organization built an international support structure around its field programs. It maintains operational and research facilities in Tanzania, offices supporting programs in Tanzania and Mozambique, fundraising structures in Switzerland and the United States, and administrative support in Belgium. An APOPO foundation was established in Geneva in 2015, and the United States office obtained 501(c)(3) tax-exempt status during the same period. By May 2024, APOPO reported more than 450 staff, 279 rats and 79 dogs in various stages of breeding, training, research and deployment. Its continuing model combines humanitarian operations, scientific research, public education, donor fundraising and animal welfare.

• 2017

  Cambodia visitor center opens

  [1]APOPOen.wikipedia.org

  A visitor center in Siem Reap began showcasing HeroRAT training and mine-action education.

• 2015

  Mozambique declared free of all known landmines

  [1]APOPOen.wikipedia.org

  Mozambique made its official mine-free declaration after clearance efforts involving APOPO and other organizations.

• 2015

  Swiss foundation and United States nonprofit structures established

  [1]APOPOen.wikipedia.org

  APOPO strengthened international fundraising and institutional support through a Geneva foundation and a United States 501(c)(3) office.

• 2013

  Programs expand to Mozambique and additional Angolan sites

  [1]APOPOen.wikipedia.org

  Tuberculosis screening was replicated in Maputo, while mine-action operations continued expanding in Angola and Mozambique.

• 2012

  Gaza Province declared mine-free

  [1]APOPOen.wikipedia.org

  APOPO's clearance work helped Mozambique's Gaza Province reach mine-free status ahead of schedule.

• 2010

  Automated training cage developed

  [1]APOPOen.wikipedia.org

  APOPO introduced an automated cage using optical sensors and automatic rewards to standardize scent training.

• 2008

  Proof of principle for tuberculosis scent detection

  [1]APOPOen.wikipedia.org

  Research demonstrated that trained rats could identify pulmonary-tuberculosis-positive sputum samples.

• 2007

  Tuberculosis program begins in Tanzania

  [1]APOPOen.wikipedia.org

  APOPO began field tuberculosis screening in partnership with four Tanzanian government clinics.

• 2004

  First rats accredited for mine detection

  [1]APOPOen.wikipedia.org

  The first eleven APOPO rats received accreditation under International Mine Action Standards.

• 2003

  Tuberculosis detection research receives seed funding

  [1]APOPOen.wikipedia.org

  A World Bank grant supported investigation of rats as screeners for tuberculosis in sputum samples.

• 2000

  Training and headquarters move to Tanzania

  [1]APOPOen.wikipedia.org

  APOPO moved its main training and research activities to the Sokoine University of Agriculture in Morogoro.

• 1997

  APOPO project launched

  [1]APOPOen.wikipedia.org

  Bart Weetjens and Christophe Cox launched the project in Belgium on 1 November, beginning formal development of trained-rat detection technology.

APOPO positions itself as an evidence-based humanitarian organization using low-cost, adaptable biological detection systems alongside conventional mine-action and public-health tools. Its distinctive identity rests on the HeroRAT and HeroDOG brands, scientific validation, field partnerships, animal welfare and the practical needs of communities affected by landmines and tuberculosis.

• Mine-action service · 2004

  HeroRAT landmine detection

  African giant pouched rats are trained to recognize explosive odors and indicate the presence of mines to handlers. They operate with conventional clearance teams, mechanical equipment and manual deminers rather than functioning as a complete clearance system by themselves. Their light weight and resistance to irrelevant metal objects make them useful for surveying suspect land.

• Explosive detection service

  HeroDOG technical survey

  APOPO uses Belgian Malinois and Dutch Shepherds to survey larger or densely vegetated areas for explosive odors. Dogs complement rats by covering ground quickly and working in environments where rats may be less practical. Their training uses play-based rewards, scientific testing and accreditation procedures.

• Public-health screening service · 2007

  HeroRAT tuberculosis screening

  Trained rats screen human sputum samples for odor patterns associated with tuberculosis after initial examination in clinics. Positive or suspicious results can be referred for additional laboratory assessment. The program is designed to increase the number of potentially missed cases identified by existing health systems.

• Research and training technology · 2010

  Automated scent-training cage

  The automated cage uses optical sensors to track an animal's response to target scents and automatically provides a click and food reward. APOPO developed it to improve consistency, speed training and reduce the risk of unconscious handler influence during learning and evaluation.

• 2017Siem Reap HeroRAT visitor center

  Cambodia · International visitors

  APOPO used a public visitor center in Siem Reap to explain animal-based mine detection, demonstrate training and connect public education with fundraising for humanitarian programs.

  Outcome. The center provided a continuing public-facing platform for education about mine contamination and APOPO's detection methods.

  Source

• 2013

  Expand mine-action operations in MozambiqueStrategy

  Background

  After work in Gaza Province, APOPO had an opportunity to support clearance in additional areas affected by conflict.

  Action taken

  The organization expanded operations to Maputo, Manica, Sofala and Tete provinces.

  Aftermath

  APOPO contributed to the clearance of five provinces before Mozambique's 2015 mine-free declaration.

  Source

• 2010

  Automate parts of animal trainingOther

  Background

  Manual training can introduce inconsistency or unconscious handler cues.

  Action taken

  APOPO developed an optical-sensor training cage that automatically records responses and delivers rewards.

  Aftermath

  The system was intended to make scent learning more standardized and measurable.

  Source

• 2003

  Extend scent detection into tuberculosis screeningStrategy

  Background

  The organization sought a second humanitarian application for its trained rats beyond mine action.

  Action taken

  With World Bank seed support, APOPO began research into detecting tuberculosis in sputum samples.

  Aftermath

  A Tanzanian field program began in 2007 and later expanded to Mozambique and related research partnerships.

  Source

• 2000

  Shift core operations to TanzaniaStrategy

  Background

  APOPO needed an appropriate environment and institutional partner for breeding, training and researching African giant pouched rats.

  Action taken

  It established its principal training and research base at the Sokoine University of Agriculture in Morogoro.

  Aftermath

  Morogoro became the organization's operational headquarters and the center of its animal-development model.

  Source

1. 1APOPOen.wikipedia.org
2. 2APOPO official websiteapopo.org