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Vol. 48. Issue 3.
Pages 281-289 (May - June 2020)
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Vol. 48. Issue 3.
Pages 281-289 (May - June 2020)
Original Article
DOI: 10.1016/j.aller.2019.10.005
Sensitisation to aeroallergens in relation to asthma and other allergic diseases in Angolan children: a cross-sectional study
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Margarete Arraisa,b, Ofélia Luluaa, Francisca Quificaa, José Rosado-Pintoc, Jorge M.R. Gamad, Miguel Britob,e, Luis Taborda-Barataf,g,h,
Corresponding author
tabordabarata@fcsaude.ubi.pt

Corresponding author at: CICS-Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal.
a Department of Pulmonology, Military Hospital, Luanda, Angola
b CISA – Health Research Center of Angola, Caxito, Bengo, Angola
c Department of Immunoallergology, Hospital da Luz, Lisbon, Portugal
d Centre of Mathematics and Applications, Faculty of Sciences, University of Beira Interior, Covilhã, Portugal
e Health and Technology Research Center (H&TRC), Escola Superior de Tecnologia da Saúde de Lisboa, Instituto Politécnico de Lisboa, Portugal
f Department of Allergy & Clinical Immunology, Cova da Beira University Hospital Centre, Covilhã, Portugal
g CICS- Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal
h CACB – Clinical Academic Center of Beiras, Portugal
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Tables (6)
Table 1. Sociodemographic data of study sample (n = 1023).
Table 2. Sensitisation to aeroallergens in 82 children with positive skin prick tests.
Table 3. Comparison of prevalence of sensitisation to the most common aeroallergens between urban and rural children.
Table 4. Relationship between the prevalence of sensitisation to the most common aeroallergens and prevalence of allergic diseases.
Table 5. Relationship between mono- and poly-sensitisations to aeroallergens and allergic diseases.
Table 6. Analysis of factors that may potentially affect sensitisation to aeroallergens.
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Abstract
Introduction and Objectives

In Africa, few studies of sensitisation profiles have been performed in children or adolescents and, in Angola, there are none. The objectives of the present study were to assess the sensitisation profile of Angolan schoolchildren and to determine the relationship between that pattern, sociodemographic factors, asthma and other allergic diseases.

Materials and Methods

Cross-sectional, observational study in 5-14-year-old children, performed between September and November 2017, in the Province of Bengo, Angola. Five schools (15%) were randomly selected in the geographical area of the study: three from an urban area, and two from a rural area. Data were collected using the Portuguese versions of the ISAAC questionnaires for children and adolescents, regarding asthma, rhinitis and eczema. Skin prick tests (SPT) were performed with a battery of 12 aeroallergens. Stools were assessed for the presence of helminths. Descriptive statistics were used, as well as univariate calculation of odds ratios.

Results

Sensitisation to aeroallergens was low (8%) and most sensitised children were asymptomatic. Most frequent sensitisations involved house dust mites, cockroach or fungi, and a high proportion of children (78.1%) were monosensitised. No relationship was detected between sensitisations and asthma, rhinitis or eczema. Place of residence, gender, age or helminthic infection did not affect the probability of having positive SPTs.

Conclusions

The most frequent sensitisations in children from Bengo Province in Angola involve house dust mites, followed by cockroach and fungi. No relationship was found between atopic sensitisation and asthma or other allergic diseases.

Keywords:
Angola
Allergens
Asthma
Atopy
Sensitisation
Skin prick tests.

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