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The Great Border Mosquito Massacre (or Dengue and Dengue Hemorrhagic Fever at the TX-MX Border). Mary Hayden Research Review October 4, 2007. Presentation Outline. Recent History of Dengue in Mexico/South Texas 2005 Outbreak Investigation Methods Results Current Study.

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the great border mosquito massacre or dengue and dengue hemorrhagic fever at the tx mx border
The Great Border Mosquito Massacre (or Dengue and Dengue Hemorrhagic Fever at the TX-MX Border)

Mary Hayden

Research Review

October 4, 2007

presentation outline
Presentation Outline
  • Recent History of Dengue in Mexico/South Texas
  • 2005 Outbreak Investigation
  • Methods
  • Results
  • Current Study
dengue fever df and dengue hemorrhagic fever dhf
Dengue Fever (DF) and Dengue Hemorrhagic Fever (DHF)
  • Flavivirus transmitted by Aedes mosquitoes
  • Disease characterized by sudden onset of headache + fever – myalgia – anorexia - arthralgia
  • Endemic in tropics
  • Increasing incidence worldwide
  • Estimated 50-100 million dengue infections annually
aedes aegypti and dengue fever
Aedes aegypti and Dengue Fever
  • Aedes aegypti is the principal vector of yellow fever and the dengue viruses.
  • Peri-domestic, day-biting mosquito which breeds in and around humans
  • Prefers to breed in artificial containers such as vases, pet dishes, 55 gallon drums
dengue in south texas
Dengue in South Texas

4 outbreaks with local transmission

Hafkin B. Am J Trop Med Hyg 1982; 31(6), 1222-8

Gubler D. "Dengue and Dengue Hemorrhagic Fever." Tropical Infectious Diseases. 2nd ed.

MMWR 1996;45(39);841-4 MMWR 2000;50:57-9

slide7

Cases of Dengue Fever and Dengue Hemorrhagic Fever (DHF)

Reported in Tamaulipas, Mexico from 2000 to 2006

Source: Boletín Epidemiolgía [Spanish].

México, D.F. Dirección General de Epidemiología, 2001 – 2007.

Available at http://www.dgepi.salud.gob/mx/boletin.

slide8

Matamoros

Cases of dengue by week of report, Matamoros (Mexico) and Cameron County, TX, 2005

Cameron County

150

100

Number of cases

Serosurveys,5-15 Dec

Autochthnous DHF,Cameron County

50

0

9

9

8

15

22

29

12

19

26

12

19

26

16

23

30

14

21

28

11

18

25

16

23

30

13

20

27

10

17

24

15

22

29

12

19

26

10

17

24

31

2 Jul

2 Apr

1 Oct

8 Jan

4 Jun

5 Mar

5 Feb

5 Nov

3 Dec

6 Aug

3 Sep

7 May

methods
Methods
  • Two stage cluster sample design (WHO) - systematically selected census tracts after ordering by socioeconomic status (SES) and then randomly selected households from within the sampled census tract
  • Household-level
    • Questionnaire with travel history
    • Blood samples
    • Entomological survey
  • Serology testing
  • Results were weighted to reflect each individual’s chance of selection in the sample.
seroprevalence of anti dengue igm and igg antibodies by city
Seroprevalence of anti-dengue IgM and IgG Antibodies* by City

* Weighted point estimate and (95% confidence interval).

slide11

Spatial Distribution of IgM Positive Participants

Brownsville

Matamoros

IgM Positive

IgM Negative

Source: Rafael Moreno, U. Colorado

select housing characteristics of participants by city
Select Housing Characteristics* of Participants by City

Characteristic MatamorosBrownsville

Central A/C 4% 46%

Room A/C 27% 40%

Intact screens 65% 61%

Mean no. occupants/home 5.4 5.0

Mean distance to neighbors (m) 3.8 10.8

Mean lot size (m2) 307 1070

* Weighted point estimates

slide15

Human-Environmental Interaction and the Effect of Waste Tire Removal on Risk for Dengue Fever Infection in Brownsville, TX and Matamoros, MX.

Funded by:

Pan American Health Organization

EPA

brownsville tx and matamoros mx
Brownsville, TX and Matamoros, MX
  • Assess human health-environmental factors, specifically the effect of waste tire proximity on human-vector contact through measurement of mosquito indices
  • Evaluate Ae. aegypti and Ae. albopictus resistance to a widely utilized organophosphate – temephos
  • Qualitatively evaluate household level perception of risk of dengue transmission from waste tires and options for control
tire interventions
Tire Interventions

Evaluation of intervention will take place the end of October