Dengue Literature Review

Cuba

4 min read

Cuba

Overview

Cuba has experienced a series of major dengue epidemics, each caused by a distinct serotype introduced in sequence, making it an epidemiologically valuable setting for studying multi-serotype exposure and its immunological consequences. The Instituto Pedro Kourí (IPK) in Havana is Cuba’s leading tropical medicine research institution and the primary source of Cuban dengue research.

Key Points from Literature

  • Cuban epidemic history: DENV-1 (1977, ~50% of population infected), DENV-2 Asian genotype (1981, ~25% of population, large DHF/DSS epidemic), DENV-2 again (1997, localised Santiago de Cuba outbreak), DENV-3 Asian genotype (2001, Havana, 78 confirmed DHF + 12,811 DF cases), DENV-4 (2006, Havana, eliminated within months) (see Garcia2009 - Long-term Clinical Symptoms Post-Dengue, Garcia2010 - Asymptomatic Dengue FcγRIIa Polymorphism).
  • Cuba’s non-endemic, epidemic-by-importation pattern and strong vector control record make it a natural model for studying genetic determinants of dengue severity without confounding by continuous transmission.
  • The 2006 DENV-4 Havana epidemic provided a cohort of hospitalized adults (97 symptomatic) and asymptomatic individuals (42) with well-documented infection histories, enabling unique follow-up studies on sequelae and genetic risk factors.
  • Among 26 symptomatic patients followed 2 years post-epidemic: 12 had tetravalent infection history (DENV-1→2→3→4), 4 had tertiary history, 5 had secondary history, and only 5 had primary DENV-4 infection (see Garcia2009 - Long-term Clinical Symptoms Post-Dengue).
  • Havana City FcγRIIa genotype distribution: 55% RR, 32% HR, 13% HH — substantially higher RR frequency than Asian populations (6–10% RR). This population-level difference may partly explain why severe dengue is more common in Asia (see Garcia2010 - Asymptomatic Dengue FcγRIIa Polymorphism).

1997 Santiago de Cuba DENV-2 epidemic (Guzman2016)

  • A localised DENV-2 outbreak in Santiago de Cuba in 1997, 16 years after the island-wide 1981 DENV-2 epidemic; individuals exposed in 1981 were re-exposed to DENV-2 rather than to a new serotype
  • The overt:subclinical ratio was nearly 1:1 in those sensitised (prior DENV-1 exposure + now secondary DENV-2)
  • An amino acid change in the DENV-2 E protein occurred during the course of this epidemic, associated with month-by-month increases in DHF incidence — suggesting within-epidemic viral evolution affecting severity
  • This epidemic provided key evidence that within the same secondary serotype combination (DENV-1→DENV-2), viral genotype changes can shift the overt:subclinical and DF:DHF ratio (see Guzman2016 - Dengue Infection)

Cuban vector control programme (Guzman2016)

  • Cuba launched a comprehensive Ae. aegypti control programme in 1981 following the DENV-2 DHF epidemic — one of the first national-scale programmes in the Americas
  • Three pillars: larval source reduction (eliminating standing water), adulticidal spraying, and community participation in surveillance and elimination
  • Plus space spraying (fogging) to rapidly suppress adult mosquito populations during epidemic response
  • Programme successfully controlled epidemic dengue for approximately 30 years
  • Programme eventually failed due to economic difficulties and reintroduction of dengue through population movement — illustrating that vector control requires sustained funding and political will
  • The Cuban programme is cited alongside Singapore’s as an international benchmark for urban dengue control (see Aedes aegypti) (see Guzman2016 - Dengue Infection)

2013 La Habana expert consensus

  • International dengue experts met in Havana in 2013 and reviewed clinical classification data; the consensus confirmed a decrease in disease lethality following the introduction of the 2009 WHO classification system (compared with the 1997 WHO DF/DHF/DSS classification)
  • The 2009 system’s warning signs criteria provide earlier identification of at-risk patients, enabling earlier hospitalisation and fluid management — credited with the mortality reduction (see Guzman2016 - Dengue Infection)

Contradictions & Debates

None yet recorded.

Sources

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