Article Text


Cross-sectional, descriptive study of Chagas disease among citizens of Bolivian origin living in Munich, Germany
  1. Miriam Navarro1,
  2. Nicole Berens-Riha2,
  3. Stefan Hohnerlein2,
  4. Peter Seiringer2,3,
  5. Charlotte von Saldern2,
  6. Sarah Garcia2,
  7. Teresa Blasco-Hernández4,5,
  8. Bárbara Navaza1,
  9. Jonathan Shock6,
  10. Gisela Bretzel2,
  11. Michael Hoelscher2,3,
  12. Thomas Löscher2,
  13. Pedro Albajar-Viñas7,
  14. Michael Pritsch2,3
  1. 1Fundación Mundo Sano, Madrid, Spain
  2. 2Department of Infectious Diseases and Tropical Medicine, Medical Centre of the University of Munich (LMU), Munich, Germany
  3. 3German Centre for Infection Research (DZIF), partner site Munich, Munich, Germany
  4. 4Centro Nacional de Medicina Tropical (Instituto de Salud Carlos III), Madrid, Spain
  5. 5Red de investigación Cooperativa en Enfermedades Tropicales, Madrid, Spain
  6. 6The Laboratory for Quantum Gravity & Strings, Department of Mathematics and Applied Mathematics, University of Cape Town, Cape Town, South Africa
  7. 7Department of Control of Neglected Tropical Diseases, World Health Organization (WHO), Geneva, Switzerland
  1. Correspondence to Dr Michael Pritsch; pritsch{at}


Purpose Chagas disease (CD) has become a global health issue mainly due to migration. Germany lacks surveillance data and is home to a large Latin American immigrant population. Recognising that Bolivia is the country with the highest CD prevalence in Latin America, this cross-sectional, descriptive pilot study investigated CD and associated factors among citizens of Bolivian origin living in Munich, Germany.

Methods Participants completed a questionnaire in order to collect socioeconomic and health-related data. In addition, serology was performed. In case of positive serological tests, PCR diagnostic and clinical staging together with disease management was initiated. Qualitative research was conducted to identify personal and community barriers as well as strategies to increase CD awareness among the population at risk.

Results Between June 2013 and June 2014, 43 people from Bolivia (or descendants) were enrolled. A total of 9.3% (4/43), of whom two women were of childbearing age, tested seropositive (ELISA and IFAT), and one also by PCR. For 2/4 positive participants, clinical evaluation was performed and the indeterminate form of CD was diagnosed. Knowledge about CD symptoms and ways of transmission were completely absent among 55.8% (24/43, 2/4 with CD) and 30.2% (13/43, 1/4 with CD) of participants, respectively. A total of 27.9% (12/43, 0/4 with CD) of participants had donated blood prior to the study, whereas 62.8% (27/43, 3/4 with CD) were motivated to donate blood in the future. The qualitative research identified lack of knowledge as well as stigma and fears related to CD.

Conclusions Despite the small number of participants, the prevalence of CD as well as the potential risk of non-vectorial transmission was alarming. Campaigns adapted for Latin American migrants as well as control strategies should be developed and put in place in order to prevent non-vectorial transmission and actively detect cases of CD in Germany.

  • Chagas Disease
  • Migration
  • Germany
  • Trypanosoma cruzi

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Strengths and limitations of this study

  • Previously undetected cases of Chagas disease—especially among women of childbearing age—were added to the few documented cases in Germany and treatment was initiated.

  • Challenges for health professionals and for the health system to reach, diagnose and treat the at-risk population in Germany were evaluated.

  • The need for developing and implementing control strategies for Chagas disease in Germany is clearly illustrated.

  • The number of individuals in the cohort is small and not representative of the total Bolivian population in Munich or Germany. The most vulnerable group—undocumented Bolivian migrants—could not be reached. Thus, the prevalence of Chagas disease is probably underestimated and all results of this study have to be interpreted carefully.


Chagas disease (CD) is a potentially life-threatening infection caused by the protozoan Trypanosoma cruzi. Current estimations are 6–7 million infected humans worldwide.1 An initial acute phase of CD is usually followed by a lifelong asymptomatic chronic phase. About 30% of chronically infected persons develop organic dysfunctions, mostly cardiac and intestinal manifestations such as dilative cardiomyopathy or megacolon.2

Twenty-one Latin American (LA) countries are endemic for CD, and Bolivia is by far the most affected.1 However, owing to the increased population mobility, CD has become an international health issue.1 ,3 In 2012, the WHO launched the document “Accelerating work to overcome the global impact of neglected tropical diseases (NTDs)”,4 which inspired the London Declaration on NTDs.5

Vector-borne transmission has been the most common way of infection in endemic areas. In non-endemic countries without vectorial transmission, the main risks have been blood transfusions,6 organ transplantations7 and mother-to-child transmission.8 ,9 By 2009, only 4290 of the estimated 68 000–122 000 people with CD in Europe had been diagnosed, being the rate of underdiagnosis in Germany is alarmingly high.10 In some countries like France, Italy, Spain and Switzerland, epidemiological and preventive studies have already been conducted.11–15 The only CD epidemiological investigation in Germany took place in 1997 in Berlin, where 2 of 100 persons were diagnosed.16 In 2011, Germany had 154 160 registered LA migrants.17 Given an estimated CD prevalence of between 1.3 and 1.7% in this population group10 2004 to 2621 infections could be expected. However, this rough estimation probably underestimates the number; LA migrants without legal status and the growing number of LA migrants moving mainly from Spain to Germany in the past years have not been taken into account (General Consulate of the Plurinational State of Bolivia in Madrid, Spain; personal communication). This alarming lack of CD epidemiological information in Germany suggests limited knowledge about CD in key groups, such as the affected population itself, healthcare professionals and decisionmakers, and inadequate prevention and management of CD. Control of transfusional, transplantational and congenital transmission of CD in Germany is still insufficient in the context of the European Union recommendations and protocols of other European countries.18–20 In Spain, serological screening for population at risk of T. cruzi infection has been implemented by law since 2005,21 and in the USA since 2007.22 In Germany, however, blood donors are only asked if they are suffering from any parasitic infection at present; CD is mentioned, but guidelines recommend no serological screening for people at risk. Only travellers who visited endemic countries within the previous 6 months are excluded from donating blood23 and no routine screening is performed for pregnant women from endemic countries.

The following has been designed as a pilot study, which could be useful for further research and control of the disease, in preparation for a national project called ‘ELCiD‘ (detection and guidance of patients with CD in Germany),24 that started Germany-wide in May 2014.



The objectives of this cross-sectional, descriptive pilot study were:

  1. To detect previously undiagnosed cases and determine the prevalence of CD in a cohort of the Bolivian community living in Munich

  2. To evaluate the possibility of the congenital, transfusional and transplantational risk of T. cruzi infection transmission

  3. To describe the knowledge, feelings and attitudes related to CD, at the personnel and community level, of people from Bolivia living in Munich

  4. To identify possible strategies to overcome barriers to T. cruzi infection prevention and access to healthcare to reach at-risk populations in Germany.

Setting and participants

The study took place in the outpatient clinic of the Division of Infectious Diseases and Tropical Medicine (DIDTM) in Munich, Germany. Participants were recruited through (1) dissemination of informative leaflets, (2) informative presentations at local Bolivian meeting points (eg, Bolivian consulate) and events within the local Bolivian community, (3) social media, as well as (4) the outpatient clinic of DIDTM and family doctors' offices. Regarding inclusion criteria, all citizens of Bolivian origin living in the commuter belt (urban railway) of Munich that came to the LMU and gave written informed consent were included. Participants under the age of 18 years were included via written informed consent from their parents. Citizens of Bolivian origin who had neither been in Bolivia nor had a Bolivian mother, and all persons lacking the capacity to give informed consent were excluded. All investigation was conducted according to the principles expressed in the Declaration of Helsinki and participation was free of charge.

Questionnaires and qualitative research

All participants completed a questionnaire in order to collect socioeconomic and medical data (see online supplementary appendix). All documents were in German and Spanish, and a bilingual (Spanish-German) medical doctor was available for assistance at all times. Concerning qualitative research, two semistructured interviews, a triangular group and one Participatory Action Research (PAR) activity with seven participants was carried out. Qualitative research was conducted in a total of 12 participants. Selection criteria were: those participants in the study who wanted to be interviewed, prior to as well as after performing the serological test. The PAR consisted of an informative workshop about CD given by a medical doctor. All activities were recorded, transcribed and underwent quality control. Open Code 4.02 software was employed for the analysis. Methodological (within-method) and investigator triangulation was performed by three researchers.

CD diagnosis

Two independent serological tests were performed: in-house-ELISA25 and in-house-IFAT.26 Only if both test results were concordant were they considered positive or negative. Discordant results should be dealt with individually and solved using a third serological test as well as external quality control. After diagnosis, two different PCR tests were performed: a conventional PCR27 and a real-time PCR (Dia.Pro—Diagnostic Bioprobes Srl, Sesto San Giovanni, Italy) test. For external quality control, all positive and 10% of all negative samples were sent to the Spanish reference laboratory for CD (National Centre of Microbiology, ISCIII).28 In summary, positive samples were detected using five different serological methods and additionally tested with three independent PCRs, performed in two different laboratories. Negative samples were confirmed with a minimum of two diverse serological tests at DIDTM, and 10% of negative samples were confirmed with three additional serological tests at ISCIII.

Staging and management of CD

Participants diagnosed with CD were offered specialised clinical management by a medical doctor. In order to detect visceral involvement of CD, a complete history as well as physical examination, further laboratory tests, a resting ECG and cardiac ultrasound was performed. All CD-positive patients were counselled not to donate blood or organs, and screening was offered to their relatives. Positive participants were offered antiparasitic treatment based on the WHO recommendations.29 ,30 Benznidazole was used as the first-line medication and was provided by the WHO. During treatment, close monitoring was performed. All positive participants were offered yearly follow-up visits including history, physical examination and an ECG.

Statistical analyses

Data were entered via double data entry into tables (Microsoft Excel, V.14.3.1). Individual data were analysed using STATA (V.11). For calculation of p values, χ2 and Student's t-tests were used, where appropriate. If data were found to be skewed, a Mann-Whitney rank sum test was used. p Values of <0.05 were considered statistically significant. Knowledge about CD symptoms was grouped into categories: ‘none’, ‘poor’ (one symptom named), ‘intermediate’ (more than one symptom named) and ‘good’ (three frequent symptoms named). Knowledge about ways of transmission was grouped into categories such as ‘none’, ‘poor’ (one way of transmission named), ‘intermediate’ (2–3 ways named) and ‘good’ (4–5 ways named).


Between June 2013 and June 2014, 43 participants were enrolled, of whom 29 (67.4%) were female. The mean age was 39 years (SD 17.2 years), range 7–76 years. All participants possessed a valid German residency permit and were of Bolivian (22/43; 51.2%), German (20/43; 37.2%), Spanish (4/43; 9.3%) and Italian (1/43; 2.3%) nationalities. Four participants possessed dual citizenship (German and Bolivian). The mean duration of stay outside of Latin America was 19 years (SD 13.7 years). Emigration from Bolivia generally occurred when the participants were young adults (mean 22 years, SD 2.2). Those who were born in Germany and never went to Bolivia were not included in this analysis; most of them were children.

CD prevalence and association with socioeconomic factors

There were no discrepancies in any serological tests performed at DIDTM and ISCIII. Four participants (9.3%, CI 0.26% to 18.35%) tested positive for CD (three women and one man), table 1. Two of these women were of childbearing age and wanted to get pregnant. One woman was also positive by PCR. The only significant correlations with testing CD positive and the socioeconomic factors were a higher risk for participants of rural origin (p=0.017) and participants born to a mother with CD (p=0.003).

Table 1

Socioeconomic factors and CD status

Clinical evaluation and management of CD

All positive participants were offered a clinical evaluation as well as treatment (where appropriate), free of charge. Only one CD-positive patient (70 years, male) denied the diagnosis and refused further follow-up. One positive female participant had moved abroad (Switzerland) and planned to get clinical evaluation and treatment there. The remaining two positive female participants consisted of a mother (46 years; the only PCR-positive participant) and her daughter (24 years). During clinical evaluation, no symptoms or findings consistent with organ involvement were found and both were diagnosed with the indeterminate stage of CD. Both were treated with benznidazole (5 mg/kg per day for 60 days) and tolerated treatment well without adverse events. The initially positive PCR was negative when repeated 3 months after treatment.

Attitudes towards blood/organ donation and medical access

Most of the participants were motivated to donate blood (27/43; 62.8%; 3/4 with CD) and organs (23/43; 53.5%; 3/4 with CD). Nearly all participants had access to regular healthcare in Germany (38/43; 88.4%; 3/4 with CD); five did not answer this question (table 2).

Table 2

Attitudes towards blood and organ donation and access to healthcare

Knowledge about CD

Only 30 participants (69.8%; 3/4 with CD) had previously heard about CD and 24 (55.8%; 2/4 with CD) had no knowledge of CD symptoms. The possible presence of CD without symptoms was falsely denied by two participants; one of them had CD. Most of the participants (40/43; 93.0%; 4/4 with CD) had never undergone a CD test before (table 3).

Table 3

Participants’ knowledge about CD

Qualitative research

Knowledge about CD

Participants focused mainly on insect and congenital transmission table 4. Otherwise, large confusion and a lack of knowledge about other mechanisms of transmission were reported (Verbatim 1).

Table 4

Verbatims of interviews, triangular group and participatory action research

All participants knew that symptoms could appear after several years. In general, there was a lot of confusion and lack of understanding on the clinical manifestations (Verbatim 2).

Participants gathered information about CD mainly from friends, relatives and attending physicians, as well as from the internet, press and information received in their home countries. Bolivian associations and the media stood out as being primary resources (Verbatim 3).

Participants' responses confirmed that there is a lot of lack of knowledge about CD. They considered it highly important to inform about CD at meeting points, such as Bolivian associations, sports events and others. The most effective ways to inform people were audio-visual material, leaflets, via radio; and the key points to focus on were the Spanish parish and the Evangelic Latin Church. It was emphasised that adequate medical information and the help of the health system to encourage people to undergo screening must accompany these activities (Verbatim 4).

Barriers and facilitators of access to the health system

The obstacles for access to the health system were mainly structural and psychosocial factors, as well as living and working conditions (Verbatim 5).

Participants reported that it was not possible to have a health insurance card without having a contract of employment, as well as displaying a lack of knowledge about social resources and immigrant rights in Germany (Verbatim 6).

Generally, there was a high level of satisfaction with the German health system, the physicians being seen as professionals with knowledge about CD (except in one reported case). The individual medical assistance stood out positively, especially when the healthcare professionals spoke Spanish (Verbatim 7).

The precarious working conditions and long working days were described as making it difficult to find a medical consultation compatible; attending a medical consultation could mean an economic loss or even unemployment for the patient (Verbatim 8).

Other barriers included: low acknowledgement of the risk of dying from CD (Verbatim 9); lack of interest and volition of LA people to approach a physician (Verbatim 10); and the culture of attending a doctor only in urgent situations (Verbatim 11). The participants pointed out that in combination with the ignorance about CD, these barriers impede access to the health system.

The most important factors to deciding to perform screening were: fear of transmitting CD to someone's own children (Verbatim 12), having relatives or friends suffering from CD, having been in contact with the vector in the past or having lived in rural areas (Verbatim 13).


The prevalence of T. cruzi infection varies according to the locations and the methodology used to reach the population at risk. The prevalence in our study was 9.3%, much lower than in cohorts with previous informational campaigns in Spain and Switzerland (20.9–26.2%)11 ,13 and in Tropical Medicine Centers in Spain (higher than 30%; due to a selection bias because many patients who attend these consultations already know or have a high suspicion of suffering from CD).8 ,20 ,31 However, it is similar to one study performed among Bolivian blood donors (10.2%)32 and in a similar study performed in Spain.33 The reason could be that the profile of participants is similar in these cohorts, as several participants came from regions with a low prevalence of CD.

Nevertheless, the strength of this initiative lies in the detection of new patients. Up to 93% of participants (including those with positive serology) had never been tested for CD previously. Probably, in the absence of this programme, the four new patients would still be unaware of their serological status. In fact, Europe is facing a CD underdiagnosis crisis with higher than 95% of at-risk communities not being tested.10 This highlights the need for additional public health measures involving communities from endemic areas.

According to the German Census of 2011,17 2703 persons with Bolivian nationality were registered in Germany. Of those, 460 were in Bavaria and 182 in Munich. The number of German citizens of Bolivian origin in Munich or undocumented Bolivian migrants is unknown. Of the registered Bolivian citizens in Munich, 18/89 (20.2%) with Bolivian nationality and 4/93 (4.3%) with dual citizenship could be included in this study. Previous studies indicate that Bolivian migrants without a valid residency permit and health insurance have the highest rate of CD,34 but despite serious efforts to reach this population, none could be included. Possible reasons could be fear of detection, no attendance of regular medical services, time incompatibility due to work or lack of knowledge about the possibility of treatment for CD, among others, as observed in other non-endemic countries.35 ,36 With this in mind, the prevalence of CD is probably underestimated and all results of this study have to be cautiously interpreted. In addition, the migration of LAs from the Southern to Central Europe has considerably increased in the past few years.

In Germany, treatment of patients with CD poses several challenges: few centres disseminate knowledge regarding the treatment of CD, as national guidelines for screening and treatment are not available. Also, the two drugs currently in use (benznidazole and nifurtimox) are neither registered nor available in Germany. Thus, they are difficult to obtain and have to be used unlicensed. Although it is possible to receive those drugs free of charge from the WHO, during this study their import posed difficulties at DIDTM. It took lengthy correspondence by the medical doctors in charge of treatment with the legal department of DIDTM and the WHO due to a lack of information about legal implications of this process. The absence of specific treatment in Germany needs to be addressed by the scientific community and the health authorities. Structural issues clearly need to be improved as, for example, has been highlighted in the USA.22

There is a serious lack of epidemiological data on CD in Germany, with only one study previously published.16 Lack of awareness of CD among politicians as well as healthcare personnel, lack of guidelines, treatment know-how, screening measurements and effective transmission control may be some of the consequences of this absence of epidemiological data.22 There is an urgent need for broader studies in Germany including more regions/subjects and a higher representativeness of the study population.

Owing to the small number of positive cases in this study, correlations of socioeconomic factors with CD were not significant. However, participants of rural origin or born from a mother with CD had a higher risk of CD, which is in concordance with previously conducted studies.13 ,37 ,38

Adequate screening and transmission control measures for CD in Germany are currently lacking. Healthcare professionals lack awareness of this disease, and thus few tests on CD are undertaken. There is no screening for pregnant women at risk, nor for blood or organ donors.18 Coupled with the high willingness to donate blood or organs among the participants, and the women of childbearing age diagnosed through this initiative (two of four of the diagnosed participants), this is alarming. There is no data of non-vectorial transmission of CD in Germany. However, in several other non-endemic countries, transmission through transfusion, organ transplantation or congenitally has been documented.18

A serious lack of information about CD among Bolivian migrants living in Munich was found from the questionnaire and qualitative research, in agreement with the findings in Spain.8 Participants obtained information on CD mainly through relatives, friends, the media and Bolivian associations. Religious meetings and other social gatherings were mentioned as effective places to disseminate information and graphic materials. These channels have been used successfully in other European countries to reach the population at risk.12 ,14 The perception of risk for CD varied depending on the existence of affected relatives, on past experiences in Bolivia and on the presence/absence of symptoms.34 Some cases of discrimination were given in reference to CD, regarding both the social and work environments, as mentioned in endemic countries.39 Some of the barriers to getting information about CD in Munich, observed in this study, were also mentioned in other non-endemic countries, such as lack of knowledge, fear and barriers to accessing healthcare services.11 ,22 ,35 ,40

The German healthcare system was generally well respected by participants. However, long waiting lists were seen as a disadvantage due to economic cuts. Problems to coordinate personal and professional lives provided barriers to access healthcare services. Discrimination was felt by one of the participants, both for being affected by CD and for being a newly arrived migrant, which also hinders access to healthcare.

Our small cohort reflects the difficulties in reaching the population at risk when the host country has cultural differences. In order to be effective, future information and awareness campaigns should investigate precisely the previous knowledge and perceptions of CD of the target population as well as the sources of information they employ. After this initiative, participants were less reluctant to reach other participants and encourage them to join the study. This information can be useful for future studies in Germany as well as in other European countries, especially for initiatives or programmes like ELCiD,24 which could increase case detection for CD in non-endemic countries and should be integrated in the common practices of public health programmes.

All mentioned public health measures are critical in order to face the United Nations development goal 3.3 (by 2030, end the epidemics of AIDS, tuberculosis, malaria and neglected tropical diseases…)41 with the renewed challenge to detect and eliminate CD in Germany and in the rest of Europe.

Summing up the limitations of this study, clearly the small number of participants has to be mentioned. Also, the most vulnerable population for CD—Bolivian migrants without a valid residency permit or health insurance—could not be reached and correlations of socioeconomic factors with CD were impaired due to the small number of positive cases. Thus, the data of this study cannot be generalised and have to be debated very cautiously, especially in the international context. Keeping that in mind, studies like the above could still increase awareness about CD as well as the difficulties to reach the most vulnerable population groups in Germany as well as in other non-endemic European countries and with this at least contribute to the detection of otherwise undetected cases of CD.


The authors thank the participants of this study and the following institutions and people: Honorary Consulate of the Plurinational State of Bolivia in Munich and the Club Illimani (especially Nicolas Resnikowski and Eduardo Berliner). The National Referral Unit for Tropical Diseases, Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Madrid, Spain, especially Dr Pérez-Molina, for his collaboration with Peter Seiringer's training in healthcare of patients with CD. María Flores-Chávez and J. Nieto of the National Centre of Microbiology (Instituto de Salud Carlos III—ISCIII, Spain) for the external quality control of laboratory diagnosis. The Centre of Tropical Medicine (ISCIII), Spain, for its collaboration in the qualitative research.


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  • MN and NB-R contributed equally.

  • Contributors NB-R, MN, MH, TL and MP conceived the study and wrote the protocol. SH, NB-R, CvS, SG and MP recruited the participants. SH, NB-R, MN, PS and MP performed the experiments. SH, NB-R, MN, BN, TB-H, JS and MP analysed the data. SH, MN and MP wrote the first draft of the manuscript. All authors contributed to and have approved the final manuscript.

  • Funding This study was supported through the Clinical Leave Programme (TI 07.001, grant to MP) and the MD Programme (TI 07.003, grant to MP and MH) by the German Center for Infection Research (DZIF). The University of Munich (LMU) contributed through the programme ‘Lehre@LMU’ (grants to MP and CS), and Mundo Sano provided financial and human resources to plan the informational approach to reach the Bolivian community living in Munich and to design and perform the qualitative research.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Ethics approval University of Munich's (LMU) Medical Faculty.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement The full anonymised data set can be provided on request.

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