Dengue cases surge in Ceará and Piauí as Brazil faces rising infection rates

dengue outbreak Ceará Piauí DENV-3 serotype public health

Northeastern Brazilian states Ceará and Piauí are facing significant dengue outbreaks in 2026. In Ceará, confirmed cases have surged by 172.7% compared to the same period in 2025, with over 11,000 confirmed cases reported by early August. Health authorities have placed 34 municipalities on alert for potential epidemics due to high incidence rates.

Health officials in Ceará are particularly concerned about the circulation of the DENV-3 serotype, which has been detected in municipalities such as Brejo Santo and Iguatu. While DENV-2 remains the dominant strain at 85.7%, the presence of DENV-3 poses a risk as much of the population lacks immunity to this specific variant. Ceará has confirmed 18 deaths related to the disease so far this year.

In Piauí, the state has confirmed 15 deaths from dengue. Teresina, the state capital, is the hardest-hit area, accounting for approximately 43% of the state's probable cases. Piauí has recorded 10,428 confirmed cases since the beginning of the year, with health officials emphasizing the importance of early diagnosis to prevent fatalities.

Entities

Ceará · Piauí · Secretaria da Saúde do Ceará · Secretaria de Estado da Saúde do Piauí · Teresina

Claims

What the coverage asserts, and how many sources carry each claim.

[● 2 SOURCES] Ceará has recorded over 11,000 confirmed dengue cases and 36,393 notifications as of early August 2026. maisfm.com · nocariritem.com.br
[● 2 SOURCES] Dengue confirmed cases in Ceará increased by 172.7% compared to the same period in 2025. maisfm.com · nocariritem.com.br
[● 2 SOURCES] The DENV-2 serotype is the predominant strain in Ceará, accounting for 85.7% of analyzed samples. maisfm.com · nocariritem.com.br
[○ 1 SOURCE] Piauí has recorded 15 confirmed deaths from dengue in 2026. www.gp1.com.br
[○ 1 SOURCE] The DENV-3 serotype has been detected in Brejo Santo, Iguatu, Russas, Fortaleza, Aracati, Caucaia, and Camocim. nocariritem.com.br
[● 2 SOURCES] 34 municipalities in Ceará are under alert due to high or very high incidence of probable dengue cases. maisfm.com · nocariritem.com.br
[○ 1 SOURCE] Teresina accounts for approximately 43% of all probable dengue cases in Piauí. www.gp1.com.br
[● 2 SOURCES] 34 municipalities in Ceará are under alert for epidemic risk due to high or very high incidence. maisfm.com · nocariritem.com.br
[○ 1 SOURCE] Teresina accounts for approximately 43% of probable dengue cases in Piauí. www.gp1.com.br
[○ 1 SOURCE] The DENV-3 serotype has been detected in Brejo Santo and Iguatu. nocariritem.com.br
[○ 1 SOURCE] Ceará has recorded 18 confirmed deaths from dengue in 2026. nocariritem.com.br
[● 2 SOURCES] Ceará recorded over 11,000 confirmed dengue cases by early August 2026. maisfm.com · nocariritem.com.br

Sources

Dengue avança 172% no Ceará e 34 municípios entram em alerta para risco de epidemia [maisfm.com]

19 days ago

Piauí chega a 15 mortes por dengue em 2026, aponta Sesapi [www.gp1.com.br]

20 days ago

Brejo Santo e Iguatu têm registro de circulação do sorotipo DENV-3 em meio ao aumento de casos de dengue no Ceará [nocariritem.com.br]

19 days ago