Yellow Fever in Para State, Brazil: 1998-1999 Findings
Author Information
Author(s): Pedro F. C. Vasconcelos, Amelia P.A.T. Rosa, Sueli G. Rodrigues, Elizabeth S.T. Rosa, Hamilton A.O. Monteiro, Ana C.R. Cruz, Vera L.R.S. Barros, Maria R. Souza, Jorge F.S.T. Rosa
Primary Institution: Instituto Evandro Chagas, FUNASA, Ministry of Health of Brazil
Hypothesis
YF virus remains in an area after an outbreak by vertical transmission among Haemagogus mosquitoes.
Conclusion
The study found that yellow fever virus persists in certain areas due to vertical transmission in mosquito populations.
Supporting Evidence
- 23 cases of yellow fever were reported in 1998 and 34 in 1999.
- Most cases occurred on Marajo Island.
- High infection rates of YF virus were observed in mosquito populations.
Takeaway
Yellow fever can spread in areas where people haven't been vaccinated, especially when mosquitoes that carry the virus are present.
Methodology
Blood samples were collected from symptomatic individuals and mosquitoes were captured for virus isolation.
Limitations
The study may not account for all potential transmission dynamics and other animal hosts.
Participant Demographics
Patients were aged 1 to 46 years.
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