Dji's Enterprise Product Manager Eduardo Rodriguez (C) demonstrates to drone pilots from East Africa how to fly a customized DJI Agras MG-1S drone, during a training being part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Tanzanian drone pilot Khadijah Abdulla Ali (R) flies a customized DJI Agras MG-1S drone next to DJI's Enterprise Product Manager Eduardo Rodriguez during a training flight as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Two women work in a rice field near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

A customized DJI Agras MG-1S drone flies over a rice field during a pilots training flight, as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

A customized DJI Agras MG-1S drone sprays water over a rice field during a pilots training flight, as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Anopheles mosquitoes are seen in a net placed in a rice field during a test in the use of drone technology in the fight against malaria near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

A customized DJI Agras MG-1S drone sprays water over a rice field during a pilots training flight, as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Tanzanian drone pilot Khadijah Abdulla Ali (R) flies a customized DJI Agras MG-1S drone next to DJI's Enterprise Product Manager Eduardo Rodriguez during a training flight as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Drone pilot watches a customized DJI Agras MG-1S drone fly over a rice field during a training flight being part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

A man collects samples in a rice field during a test in the use of drone technology in the fight against malaria near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

Mosquito Biologist Dr. Bart Knols speaks during a media interview regarding the use of drone technology in the fight against malaria, in a rice field near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

Drone pilot watches a customized DJI Agras MG-1S drone fly over a rice field during a training flight being part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

A customized DJI Agras MG-1S drone sprays water over a rice field during a pilots training flight, as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

A customized DJI Agras MG-1S drone flies over a rice field during a pilots training flight, as part of a test in using drone technology in the fight against malaria, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Guido Welter, an entrepreneur involved in testing the use of drone technology in the fight against malaria, speaks during an interview near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

A man dispenses fertiliser in a rice field, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Mosquito Biologist Dr. Bart Knols, points to an Anopheles mosquito larvae as he speaks on the use of drone technology in the fight against malaria, in a rice field near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

A man demonstrates the effects of the Aquatain liquid solution during a test in the use of drone technology in the fight against malaria near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

Mosquito Biologist Dr. Bart Knols speaks during a media interview regarding the use of drone technology in the fight against malaria, in a rice field near Zanzibar City, on the island of Zanzibar, Tanzania, October 30, 2019. Picture taken October 30, 2019. REUTERS/Baz Ratner

Infant Ahee Bom lays on a cushion in the hallway of his home in Zanzibar City, Tanzania, February 3, 2019. After birth, Ahee's skin began to significantly darken and peel off in large strips. Traditional healer Bi Mwanahija Mzee bathed him with two scrubs made from leaves. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Traditional healer Bi Mwanahija Mzee, 56, massages three-month-old infant Abduli Juma in Zanzibar City, Tanzania, January 20, 2019. Abduli's mom, Semeni, brought him to the healer because he is very lethargic and can't hold his head up. Bi Mwanahija Mzee believes that the baby is possessed by supernatural sprits like djinns. However hospital doctors say he has an incurable brain issue. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Traditional healer Bi Mwanahija Mzee (C) checks the diaper of a child who was brought in for constipation in Zanzibar City, Tanzania, January 31, 2019. "People come here because I actually help them. I met many patients that went to hospital first and got no help or the medicine didn't work," said Mwanahija Mzee. "This is my job six days a week for more than 20 years so I do better, know more than them. Patients that come to me don't die." REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer, Bi Mwanahija Mzee, holds four-week-old patient Mundhir Nasoor, in Zanzibar City, Tanzania, January 19, 2019. The baby was brought to Bi Mwanahija Mzee because he wouldn't feed. She diagnosed him as having too high an iron intake during gestation as the primary reason for illness. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Hidaya Rayabu, 22, looks at her infant daughter hours after giving birth at Makunduchi Hospital in Zanzibar City, Tanzania, February 27, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer Bi Mwanahija Mzee (C), 56, folds root medicine in a piece of paper to give to a mother who complains of her child's constipation in Zanzibar City, Tanzania, January 31, 2019. "People come here because I actually help them. I met many patients that went to hospital first and got no help or the medicine didn't work," said Mwanahija Mzee. "This is my job six days a week for more than 20 years so I do better, know more than them. Patients that come to me don't die." REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Apprentice healer Salama chops roots to be doled out to patients at Bi Mwanahija Mzee's clinic, Zanzibar City, Tanzania, January 6, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Murtazha Hamis, 11, brought in after suffering a stroke resulting in partial paralysis, does push-ups at traditional healer Bi Mwanahija Mzee's clinic in Zanzibar City, Tanzania, January 20, 2019. Bi Mwanahija Mzee has been massaging Murtazha and prescribing him herbal baths for the past year. The boy's family credits the healer with helping the child regain mobility. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

An ornate tea service sits in a room recently renovated to film the YouTube channel of sheikh Salum, the founder of Shifaa Herbal clinic in Zanzibar City, Tanzania, March 3, 2019. Sheikhs at the Shifaa Herbal clinic read the Koran to cast out what they believe are supernatural sprits like djinns that are blamed for many maladies. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Roots and herbs sit on a table waiting to be cut into smaller pieces and given as medicine to patients at traditional healer Bi Mwanahija Mzee's clinic in Zanzibar City, Tanzania, January 5, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A baby brought to traditional healer Bi Mwanahija Mzee for help with a hair growth pattern looks at the camera in Zanzibar City, Tanzania, January 31, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer Bi Mwanahija Mzee 56, prays in her bedroom in Zanzibar City, Tanzania, February 1, 2019. "People come here because I actually help them. I met many patients that went to hospital first and got no help or the medicine didn't work," said Mwanahija Mzee. "This is my job six days a week for more than 20 years so I do better, know more than them. Patients that come to me don't die." REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A woman screams as she is treated for what she believes is possession by supernatural sprits like djinns, while other women pray at the Shifaa Herbal clinic in Zanzibar City, Tanzania, February 17, 2019. People who visit the clinic believe that they can be cured of physical, spiritual and mental illnesses caused by djinn possession while listening to a sheikh recite words from the Koran. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer Haji Mrisho speaks with pregnant patient Hidaya Rayabu, 22, at his office in Zanzibar City, Tanzania, January 9, 2019. Mrisho mainly gives blessings to pregnant women to protect their unborn babies from what they believe is possession by supernatural sprits like djinns. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Patient files lie on shelves at Kidongo Chekundu Hospital, Zanzibar's only psychiatric ward in Zanzibar City, Tanzania, August 24, 2018. Some families believe that mental illness is caused by being possessed by supernatural sprits like djinns, and so rarely bring patients to the hospital until the situation is dire. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Apprentice healer at Bin Rubea clinic Mohammed Saleh sits at his boss' dispensary waiting for customers in Zanzibar City, Tanzania, March 3, 2019. The founder of the clinic, Seif Khamis Rubea, bottles all his own products and also infuses Chinese medicine with his herbal practice. He sells these medicines at a shop 1 kilometre away from the clinic where he sees patients. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Hidaya Rayabu (C), 22, laughs with her husband, Mohammed, who holds their six-day-old daughter Jamillah in Zanzibar City, Tanzania, March 4, 2019. Mohammed travels for two hours by bus twice a week to see his wife and baby who are staying with female relatives for the first 30 days after giving birth to reduce the strain of taking care of the household. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Nadra holds her eight-month-old child Muhammad Ali, in their living room in Zanzibar City, Tanzania, February 3, 2019. Nadra took Muhammad to a traditional healer, Bi Mwanahija Mzee, to seek relief for her child suffering from an umbilical hernia. She initially took him to hospital, but is scared that if she brings the child to hospital for surgery he will die. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Traditional healer Sahihi Mrisho 67, holds medicinal roots in Makunduchi village, in Zanzibar City, Tanzania, August 26, 2018. Mrisho grows and forages most of the medicines he uses in his practice and was trained by his parents who were both healers. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A sheikh tries to rouse a woman by pouring water on her neck in Zanzibar City, Tanzania, February 17, 2019. The woman believes she is possessed by supernatural spirits like djinns. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Women gather their things in preparation for departure after a Koranic recitation at the Shifaa Herbal clinic in Zanzibar City, Tanzania, February 17, 2019. Sheikhs at the Shifaa Herbal clinic read the Koran to cast out what they believe are supernatural sprits like djinns that are blamed for many maladies. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A sheikh tries to rouse a woman by pouring water on her neck in Zanzibar City, Tanzania, February 17, 2019. The woman believes she is possessed by supernatural spirits like djinns. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Parents wait in the waiting room at Jang'ombe vaccination clinic in Zanzibar City, Tanzania, March 4, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Low tide is seen in Jambiani village, Zanzibar, Tanzania, February 21, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Rooftops of houses are seen in Fuoni village, just outside Zanzibar City, Tanzania, January 6, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer Bi Mwanahija Mzee's daughter, Hawa Abdallah, sifts peas at their home in Zanzibar City, Tanzania, February 1, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Worn pages of the Koran used in bestowing blessings is seen at traditional healer Haji Mrisho's clinic, in Jambiani village, Zanzibar City, Tanzania, August 8, 2018. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A sheikh at the Shifaa Herbal clinic holds onto a woman who is treated for what she believes is possession by supernatural sprits like djinns, in Zanzibar City, Tanzania, August 12, 2018. The woman had convulsions and fell to the floor during the process. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Fatma Hamad holds her two-year-old daughter, Khadija, while examining her x-rays at Mnazi Mmoja government hospital in Zanzibar City, Tanzania, February 5, 2019. Hamad took her daughter to hospital after one of the toddler's legs became paralysed during a high fever. Unable to find the problem through X-rays, the hospital recommended she seek out a traditional healer. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional healer Bi Mwanahija Mzee 56, massages pregnant patient Maryam Juma, 29, in Zanzibar City, Tanzania, February 2, 2019. This is Maryam's fifth pregnancy after three miscarriages and one stillborn. Both she and the healer believe the reason is because the children in the uterus were possessed by supernatural sprits like djinns. Maryam comes to Bi Mwanahija Mzee for reassurance, herbs and prayers that this baby will survive. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Thwanaidi Juma sits with her daughter Shaimaa Ahmed, one and a half years old, at traditional healer Bi Mwanahija Mzee's clinic in Zanzibar City, Tanzania, February 2, 2019. Shaimaa can't walk. Her mother went to the hospital but was told that nothing was wrong with the child so she came to Bi Mwanahija Mzee's clinic. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Fatawi Haji Hafidh, manager at Makunduchi Hospital, the second-largest government-run hospital on Zanzibar's main island, poses for a photograph in Zanzibar City, Tanzania, August 21, 2018. Hafidh said overstretched doctors and nurses may not have the time to see patients or the diagnostic equipment. Patients may also be unable to afford the medicine prescribed, or they may stop taking it before the course is finished, leading them to relapse and adding to their suspicion of government-run facilities. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Apprentice healer Salama holds a knife used for cutting herbs at Bi Mwanahija Mzee's clinic in Zanzibar City, Tanzania, January 31, 2019. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Traditional Healer Bi Mwanahija Mzee, 56, puts fresh leaves to be boiled as medicine in the purse of Khadija Salum in Zanzibar City, Tanzania, January 31, 2019. Salum is a mother of a one-year-old boy, Amar, who was brought in to the healer because he has seizures which started when he had high fever at the age of six months. The baby gets seizures since. The healer is convinced that they are brought on by supernatural sprits like djinns. REUTERS/Nicky Woo SEARCH "TANZANIA HEALTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Mgeni Hamed from Zanzibar, Tanzania poses for a portrait during a Canadian citizenship ceremony in Mississauga, Ontario, Canada, May 25, 2017. Hamed said: "What I like best about Canada is diversity, we are being treated equally no matter where you come from and what race you are." REUTERS/Mark Blinch SEARCH "CANADA FACES" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.

French President Francois Hollande (C) speaks with Mali's President Ibrahim Boubacar Keita on the rooftop of the Arab World Institute (Institut du Monde Arabe, IMA) following the inauguration of the exhibition "Tresors de l'Islam en Afrique. De Tombouctou à Zanzibar" (Islam's treasures in Africa. From Timbuktu to Zanzibar" in Paris, France, April 13, 2017. REUTERS/Geoffroy Van der Hasselt/Pool

French President Francois Hollande (R) welcomes Mauritanian President Mohamed Ould Abdel Aziz upon his arrival for the inauguration of the exhibition "Tresors de l'Islam en Afrique. De Tombouctou à Zanzibar" (Islam's treasures in Africa. From Timbuktu to Zanzibar" at the Arab World Institute (Institut du Monde Arabe, IMA) in Paris, France, April 13, 2017. REUTERS/Geoffroy Van der Hasselt/Pool

(From L) French President Francois Hollande, Mauritanian President Mohamed Ould Abdel Aziz, Mali's President Ibrahim Boubacar Keita and Burkina Faso's President Roch Marc Christian Kabore during the inauguration of the exhibition "Tresors de l'Islam en Afrique. De Tombouctou à Zanzibar" (Islam's treasures in Africa. From Timbuktu to Zanzibar" at the Arab World Institute (Institut du Monde Arabe, IMA) in Paris, France, April 13, 2017. REUTERS/Geoffroy Van der Hasselt/Pool

Former French Culture Minister and Head of the Arab World Institute (IMA) Jack Lang (2nd R), French President Francois Hollande (R), Mali's President Ibrahim Boubacar Keita (C), Burkina Faso's President Roch Marc Christian Kabore (L) and French Secretary of State for Development and Francophonie Jean-Marie Le Guen leave after visiting the exhibition "Tresors de l'Islam en Afrique. De Tombouctou à Zanzibar" (Islam's treasures in Africa. From Timbuktu to Zanzibar" at the Arab World Institute (Institut du Monde Arabe, IMA) in Paris, France, April 13, 2017. REUTERS/Geoffroy Van der Hasselt/Pool