Concerns about covert HIV testing are associated with delayed presentation of suspected malaria in Ethiopian children: a cross-sectional study

The study design is a cross-sectional survey. This study was conducted in East Shewa Zone of Oromia Regional State in Ethiopia. The total population of the Zone in 2010/11, as projected based on the 2007 census, was 1,519,103 (51% males and 49% females). The Zone is located in the Great Rift Valley of East Africa and malaria is a major health problem in the area. Five health centres, namely Modjo, Meki, Batu, Bulbula, and Shashemenne, were included in the study and data were collected in October and November 2012. All children under the age of 16 years who presented with symptoms consistent with malaria and gave finger-prick blood for microscopic examination at the health centres and their guardians constituted the study population. Data were collected opportunistically, when the guardian was available for interview. The study protocol was approved by the University of Nottingham Ethics Committee and the Addis Ababa University School of Public Health Research and Ethics Committee. All participants gave informed consent and received standard treatment for their presenting condition.

A pre-tested structured questionnaire initially developed in English and then back translated into local language (Afan Oromo) was used for data collection (see Additional files 1 and 2). The main sections of the questionnaire comprised of sociodemographic characteristics, concerns about HIV testing and treatment-seeking behaviour for the sick child. One data collector and one supervisor from each health centre were trained on the data collection instrument, interview techniques and recruitment of the study participants. Subsequent diagnosis of malaria was done using blood film examination under microscopy.

All completed data collection forms were examined for completeness and consistency during data management, storage and analysis. The time between the onset of symptoms suggestive of malaria to presentation to the health centre was the primary outcome. The main exposure of interest was the response to the question ‘do you think that HIV testing is done for all people who give blood samples for malaria testing at the heath facility?’ During analysis, the outcome variable was categorized into ‘early’ (≤2 days) and ‘late’ (≤3 days) as used in previous studies of this topic [7, 17‐19] and also as categorization using this cut-off approximated to the median value. Initial analysis was by chi-squared testing and subsequent analysis by logistic regression adjusting for potential confounding factors and clustering by health centre. The impact of urban and rural locations on the primary exposure was explored as the prevalence of HIV infection varied between these settings. All demographic exposures of interest were considered as potential confounding factors if they modified the size of association between the primary outcome and the exposure by 10% or more. The population attributable fraction of the impact of the associations observed at the population level was calculated after converting odds ratios (ORs) to relative risks (RRs) [20, 21].

The aim was to recruit 850 individuals. All children under the age of 16 years who presented at the health centre with their guardian and were clinically suspected of potentially having malaria (defined as having a blood film test requested) were eligible for inclusion in the study. The total sample size allocated to each health centre was proportional to the total patients tested for malaria in the previous 3 months (June-August, 2012) and individuals were recruited consecutively until the estimated sample size was achieved. Assuming that 20% of guardians had concerns about HIV testing in population and 50% of children have had symptoms for 5 days or less, it was estimated that the study would have over 90% power (5% risk of type I error) to detect an absolute increase of 20% in the guardians who had concerns about HIV testing in the children who experienced malaria symptoms for five days or more compared to those whose guardians had no such concerns.

The sponsors of the study had no role in study design, data collection, data analysis, data interpretation, or writing of the report. The corresponding author had full access to the data in the study and had full responsibility for the decision to submit.

A total of 836 guardians were invited to participate in the study and of these, 830 (99%) provided data for analysis. The demographics of the study participants are reported in Table 1. Some 400 children (48%) were reported as having symptoms of suspected malaria lasting more than 2 days, and 114 (14%) had sought health advice prior to the current presentation (Table 2). The overall prevalence of malaria was 20% for participants in the study, and the prevalence for each health centre was Modjo (12%), Meki (34%), Batu (18), Bulbula (15%), and Shashemenne (18%).

Four-hundred and twenty-three (51%) individuals considered that HIV testing was applied to blood given for malaria testing at the health centre (Table 3); 353 (42%) individuals knew of people in the community who delayed seeking healthcare for malaria testing due to concerns about HIV testing; 242 (29%) of individuals considered that fear of HIV testing delayed presentation with suspected malaria, with a higher proportion of these, 160 individuals (34%), living in an urban environment compared to 82 participants (23%) who lived in a rural setting (p < 0.001).

Children whose guardians suspected that blood provided for malaria diagnosis was covertly tested for HIV had a median delay of three days from the start of their symptoms to clinical evaluation compared to a median of two days for those children whose guardians did not hold this belief (p < 0.001). After adjustment for clustering by health centre, those children whose guardians were concerned about covert HIV testing had a higher odds of a prolonged delay before being seen at a health centre (OR 1.73, 95% CI: 1.10 to 2.70 for a delay of more than twp days). The age and sex of the child, residence, age of the guardian, main material of the household’s roof, presence of electricity, time to travel to the health centre and health centre location were not confounding factors for this association between HIV beliefs and a delay in presentation with suspected malaria. This resulted in a population attributable fraction for the association of concerns about covert HIV testing on delayed presentation with malarial symptoms in children of 14% (95% CI: 3 to 23%).

The main limitation of these data is that while they may be generalizable to the community studied during the period of high malarial prevalence, these attitudes to HIV testing and accessing health care in general are not necessarily applicable to other communities and cultures or at other times of the year. Hence, further studies are required to determine how prevalent the belief that covert HIV testing may accompany testing for malaria actually is in the many countries with a high prevalence of HIV. A delay of over two days before obtaining medical assessment after symptoms of suspected malaria started was seen in 49% of the study population, and similar delays have been observed from other observational studies from Nigeria [22], Senegal [23], Ethiopia [7, 24] and India [19, 25]. The estimates that these data provide of the impact of fear of covert HIV testing necessarily do not include those who died before presentation with malaria, and hence may potentially underestimate the overall impact of these beliefs on time to presentation. The data are cross-sectional, and hence it is not possible to demonstrate a causal effect. The authors were unable to exclude the possibility that acquiescence bias (an increased tendency to respond affirmatively to closed questions [26]) may have influenced the data, and await future studies that explore these beliefs and their impact on healthcare seeking behaviour in similar populations. Population-based cohort studies are necessary to study these hypotheses prospectively with consideration of baseline attitudes to HIV testing and observation of subsequent medical consultation rates. These should consider a broader range of diseases than just malaria as it is possible that these observations may reflect a wider mistrust of clinical care services that is delaying presentation of patients with other treatable conditions.

The prevalence of refusal for HIV testing among women attending for antenatal care in the Gambella Region of Ethiopia in 2008 is 25%, suggesting that in this population there was a sizeable minority who did not want to be aware of their HIV status [13]. The data suggest that these beliefs are adversely impacting on the presentation of children with suspected malaria for medical attention, due to the misplaced belief that they will also be tested for HIV. Surprisingly, little data exist on how attitudes to HIV may impact on presentation with potential malaria. Data from rural Côte d’Ivoire collected from 2010 of 100 individuals who were offered a rapid diagnostic testing for malaria reported that 67% considered that the blood would be used for HIV testing [27]. The only further data available are from two separate qualitative studies exploring the feasibility of introducing rapid diagnostic tests for malaria in Uganda in a variety of settings. In one qualitative study, community members expressed concern that blood samples collected for malaria could be used for HIV testing rather than malaria [15], which was similar to the belief held by 51% of the study population. In the second qualitative study, there were concerns that ‘in most communities people think that taking of blood means testing for HIV and some do not want their HIV status disclosed’ [16].

The observation that concerns about HIV testing may delay malaria diagnosis in children is important for public health policy makers as firstly malaria is a common disease that infects approximately 200 million individuals annually [1], and that secondly it is well recognized that prompt diagnosis and treatment are important to reduce morbidity and mortality [28‐30]. As knowledge about the disease is amenable to public education programmes [31, 32], delayed presentation with suspected malaria by the erroneous concern that covert HIV testing may also be performed may be considered a risk environmental factor that is amenable to educational programmes. If this association was causal, the OR of 1.73 approximates to a rate ratio of 1.32 [20, 21], giving a population attributable risk fraction for the fear of covert HIV testing resulting in delayed presentation of 14% children with malarial symptoms.