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About this resource
This page closely follows the Portuguese-language paper published by Bernarde and Santos in 2009. The researchers interviewed non-Indigenous people in Espigão do Oeste, Rondônia, Brazil, who had received the kambô secretion known locally as “vacina-do-sapo” (“frog vaccine”), documenting who used it, why and how they used it, and how they evaluated the results.
This is a descriptive study of the spread of use in a region, not a clinical trial of disease treatment. Responses that a person “got better” are retrospective self-assessments, not confirmation of improvement through laboratory values or diagnostic criteria. The study did not examine Indigenous tradition itself; it concerned a practice transferred to non-Indigenous people through a practitioner from another region.
Study design
The survey was conducted in Espigão do Oeste, Rondônia, in September 2005. The researchers used participant referral to identify 31 people who had received the secretion in 2003 and interviewed them with a 17-item semi-structured questionnaire containing open and selected responses. They explained the study’s purpose, obtained consent forms, and received approval from the regional research ethics committee.
To examine whether participants recognized P. bicolor, the source of the secretion, the researchers also showed color photographs of that species and 5 other frogs found in the Amazon. The design therefore examined not only experience of use but the extent to which it was accompanied by knowledge of the animal species.
Content
Of the 31 participants, 58% were men. Ages ranged from 10 to 78 years, the mean was 44, and many were aged 40–65. Educational attainment was 10% no literacy, 32% primary education, 36% secondary education, 19% higher education, and 3% postgraduate education. 68% had monthly income above 5 times the minimum monthly wage, and the authors described use as centered on middle- and higher-income groups in the area.
Reasons for participating included curiosity and health concerns such as rheumatism, diabetes, allergies, muscle pain, and gastritis. Every participant had learned about it from a friend, relative, or other third party and had heard a reputation that it was “good for anything.” 39% received it once, 55% a second time approximately 1 month later, and 6% a third time. This was not an ongoing local tradition; it had been introduced by 1 practitioner from another Amazonian region.
Application site and point count differed by sex, with the calf used primarily for women and the outer upper arm for men. The article records point counts for each application, but did not measure secretion weight, chemical composition, or absorbed amount. Point count cannot be treated as a standardized drug dose.
Results
52% responded that kambô had helped with their health concern. 39% said it had not helped, 6% noticed no difference, and 3% did not know. When asked whether they would receive it again, 52% said yes, 42% no, and 6% were uncertain. Reasons for wanting it again included self-assessments that it was “good,” “worked,” or “increased vitality.”
In small condition-specific summaries, 71% of people who named diabetes reported no improvement, while 75% of those who named rheumatism reported getting better. Small numbers of people who named allergy, muscle pain, or gastritis reported improvement. Each group was extremely small, and diagnosis, concurrent treatment, natural fluctuation, objective indicators, and follow-up duration were not controlled. These percentages must not be treated as condition-specific efficacy rates.
Many participants did not adequately know the frog from which the secretion was obtained. The authors highlighted that the secretion’s reputation was circulating without accompanying knowledge of the animal itself. The central result is a record of expanding non-Indigenous use, word of mouth, expectations, self-assessment, and species recognition—not proof of efficacy.
Because the practitioner did not return to the region, 2 people seeking a third application traveled approximately 500 km to Porto Velho. This fact indicates that the practice was spreading through dependence on a particular practitioner and word of mouth, rather than being established as an ongoing local medical system.
Limitations
The sample was small at 31 people and tied to 1 region, 1 period, and 1 practitioner. Recruitment through referrals among experienced users introduced network and selection bias and did not randomly sample all users in the region. The sample included children but was not large enough to compare safety or responses by age group.
Information was recalled approximately 2 years after application, and health status, diagnosis, medication, and laboratory values were not independently verified. With neither a control group nor prior measurement, self-reported improvement cannot be attributed to the secretion’s pharmacology. Species, batch, constituents, and amount of secretion were also not analyzed. This was a study of cultural transfer and does not represent all diverse Indigenous traditions as one.
Safety
Participants saying it was “good” or that they “would receive it again” is not a safety assessment. The study did not conduct ECG, electrolyte, liver or kidney testing, standardized assessment of acute symptoms, or follow-up of delayed events. Because point count did not correspond to constituent amount, no safe dose can be derived.
The large number of users who did not recognize the frog shows that practices may travel with insufficient information about source, constituents, quality, and conservation. Disease names circulated by word of mouth should not be treated as medical indications.
Source and rights
Original source: Bernarde PS, Santos RA. Utilização medicinal da secreção (“vacina-do-sapo”) do anfíbio kambô (Phyllomedusa bicolor) (Anura: Hylidae) por população não-indígena em Espigão do Oeste, Rondônia, Brasil. Biotemas. 2009;22(3):213–220. DOI: 10.5007/2175-7925.2009v22n3p213.
The publication page displays Creative Commons Attribution 4.0 (CC BY 4.0). This page follows the design, principal numbers, and conclusions of the Portuguese-language source without reproducing its questionnaire, tables, figures, or participant quotations verbatim.