Volume 26, Number 7—July 2020
Synopsis
Transmission of Chikungunya Virus in an Urban Slum, Brazil
Rosângela O. Anjos, Vánio André Mugabe, Patrícia S.S. Moreira, Caroline X. Carvalho, Moyra M. Portilho, Ricardo Khouri, Gielson A. Sacramento, Nivison R.R. Nery, Mitermayer G. Reis, Uriel D. Kitron, Albert I. Ko, Federico Costa, and Guilherme S. Ribeiro
Table 2
Crude and adjusted prevalence ratios for persons with previous chikungunya virus infection, by demographic and clinical characteristics, Salvador, Brazil, November 2016–February 2017
| Characteristic | Crude prevalence ratio (95% CI)* | Adjusted prevalence ratio (95% CI)† |
|---|---|---|
| Sociodemographic | Model 1 | |
| Illiteracy | 1.60 (0.99–2.60) | |
| Not working | 1.28 (0.97–1.68) | |
| Residence located in an unpaved street | 1.52 (1.07–2.15) | 1.52 (1.07–2.15) |
| Type of residence construction | ||
| Plastered wall | Referent | |
| Unplastered wall | 1.47 (0.92–2.35) | |
| Wood/Other material |
1.86 (1.06–3.28) |
|
| Clinical: reported symptoms‡ | Model 2 | |
| Fever and arthralgia | ||
| None | Referent | Referent |
| Only fever | 1.29 (0.89–1.86) | 0.96 (0.62–1.49) |
| Only arthralgia | 2.45 (1.60–3.75) | 1.55 (0.95–2.53) |
| Both, not simultaneous | 1.91 (0.97–3.77) | 1.22 (0.56–2.67) |
| Both, simultaneous | 3.64 (2.51–5.28) | 2.26 (1.43–3.57) |
| Myalgia | 1.75 (1.23–2.50) | |
| Rash | 2.28 (1.68–3.08) | |
| Pruritus | 2.14 (1.51–3.03) | |
| Presumptive clinical diagnosis | ||
| Chikungunya | 4.66 (3.35–6.48) | 2.83 (1.97–4.05) |
| Dengue | 1.67 (1.09–2.56) | |
| Zika | 2.45 (1.78–3.39) |
*Crude prevalence ratios shown for variables with bivariate p values <0.20, selected for inclusion in the initial multiple variable model.
†Two different multiple variable models were applied using backward selection. The first model included only sociodemographic variables to investigate potential exposures associated with CHIKV infection; the second model included only clinical characteristics to investigate predictors of seropositivity.
‡Reported symptoms with onset after January 2015.
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Page updated: June 18, 2020
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