Paraguay
Overview
Paraguay is a landlocked country in South America with endemic dengue transmission. The tropical and subtropical climate and presence of Aedes aegypti create year-round transmission risk. The country is described in the literature as experiencing “hyperimmune responses” to dengue — a term used clinically to refer to particularly pronounced immunopathological outcomes in infected individuals, possibly reflecting high rates of secondary infection in an endemic-transmission setting.
Key Points from Literature
Endemic Context and Unusual Presentations
Morel2014 - Autoimmune Response in Children With Dengue is the sole wiki source from Paraguay. The study was conducted at the Hospital Central del Instituto de Previsión Social, Asunción (the national social security referral hospital). Three pediatric patients were reported with dengue-associated autoimmune complications, representing a spectrum from self-limiting (Case 1) to severe macrophage activation syndrome (MAS) requiring corticosteroids (Cases 2 and 3). All three were male; ages ranged from 3 months to 8 years.
Key clinical features documented in Paraguayan patients:
- MAS/secondary HLH as a dengue complication: Cases 2 and 3 fulfilled 5 of 8 HLH-2004 criteria (fever, hepatosplenomegaly, cytopenias, hypertriglyceridemia, hyperferritinemia) without bone marrow hemophagocytosis; responded to methylprednisolone
- ANA and anti-dsDNA negative in all cases — including the most severe MAS presentations
- NS1 antigen positivity confirmed dengue in Cases 2 and 3; IgG+IgM serology in Case 1
- Autoimmune marker asymmetry: IgM anticardiolipin was positive and hypocomplementemia and proteinuria present in the milder Case 1, while more severe cases had no conventional autoantibodies
The Paraguayan cases support the generalisation that dengue in Latin American endemic settings can trigger atypical, immune-mediated presentations that may be mistaken for primary autoimmune disease. The authors emphasise that dengue should be included in the differential diagnosis of any systemic disease in the paediatric population in endemic regions.
Epidemiological Context
Specific dengue incidence figures or outbreak data for Paraguay are not available from this wiki’s sources. Paraguay is part of the broader South American endemic zone where multiple DENV serotypes co-circulate; the serotype responsible for the Morel2014 cases was not specified.
Contradictions & Debates
No within-source contradictions. The single source (Morel2014) presents three cases without a denominator, limiting epidemiological interpretation. The frequency of dengue-triggered MAS in Paraguay’s endemic population is unknown.