# Chikungunya outbreak and vaccine developments in MS > Live situation record from CLSTR: https://clstr.news/situations/mato-grosso-do-sul-chikungunya-outbreak-2026 > Updated: 2026-08-19T17:37:07.000Z. Sources: 44. Developments: 5. By the 32nd epidemiological week, Mato Grosso do Sul has seen a continued rise in chikungunya infections, reaching 10,041 confirmed cases out of 12,663 probable cases. The death toll remains at 30 confirmed fatalities, with cases spread across various municipalities including Dourados, Bonito, Jardim, Fátima do Sul, Douradina, Guia Lopes da Laguna, Itaporã, Ponta Porã, Nioque, and Corumbá. The number of confirmed infections among pregnant women remains at 114. Dengue activity also persists. As of the 32nd week, the state has documented 1,978 confirmed cases and 4,667 probable cases. One death in Bonito has been confirmed, while two other dengue-related deaths are currently under investigation. The state’s vaccination campaign for children and adolescents aged 10 to 14 has administered 223,322 doses of the dengue vaccine to date. In response to the arbovirus threat, Brazil is advancing vaccine development. The Instituto Butantan has been authorized to produce the Butantan-CHIK vaccine, developed in partnership with Valneva, targeting individuals aged 18 to 59 with increased exposure risk. Furthermore, the pharmaceutical company Eurofarma has requested that Anvisa analyze the CHIKV VLP vaccine, which has already received approval in several other countries. Health authorities continue to emphasize preventive measures to mitigate the spread of the virus and its potential for long-term debilitating joint pain. ## Claims - Mato Grosso do Sul recorded 12,735 probable chikungunya cases in 2026. (corroborated by 8 sources) - 9,729 chikungunya cases were confirmed in Mato Grosso do Sul in 2026. (corroborated by 8 sources) - 28 deaths from chikungunya were confirmed in the municipalities of Dourados, Bonito, Jardim, Fátima do Sul, Douradina, Guia Lopes da Laguna, Itaporã, Ponta Porã and Nioaque. (corroborated by 8 sources) - One chikungunya death remains under investigation. (corroborated by 8 sources) - 114 confirmed chikungunya cases were reported among pregnant women. (corroborated by 8 sources) - Mato Grosso do Sul recorded 4,760 probable dengue cases in 2026. (corroborated by 8 sources) - 1,828 dengue cases were confirmed in Mato Grosso do Sul in 2026. (corroborated by 8 sources) - One dengue death was confirmed in Bonito in 2026. (corroborated by 8 sources) ## Timeline ### 2026-08-19: Mato Grosso do Sul reports 10,041 confirmed chikungunya cases Mato Grosso do Sul reports 10,041 confirmed chikungunya cases and 30 deaths in 2026, alongside nearly 2,000 confirmed dengue cases. 11 sources. https://clstr.news/cluster/mato-grosso-do-sul-reports-10041-confirmed-chikungunya-cases ### 2026-08-16: Chikungunya cases surge in Mato Grosso do Sul amid vaccine advances Mato Grosso do Sul reports nearly 10,000 confirmed chikungunya cases and 30 deaths in 2026, while Brazil advances new vaccine production through Instituto Butantan and Eurofarma. 10 sources. https://clstr.news/cluster/mato-grosso-do-sul-reports-9961-confirmed-chikungunya-cases ### 2026-08-10: Mato Grosso do Sul reports 9,832 confirmed chikungunya cases Mato Grosso do Sul reports 9,832 confirmed chikungunya cases and 30 deaths in 2026, alongside 1,873 confirmed dengue cases. 5 sources. https://clstr.news/cluster/mato-grosso-do-sul-reports-9832-confirmed-chikungunya-cases ### 2026-07-29: Mato Grosso do Sul records 9,729 confirmed chikungunya cases in 2026 Mato Grosso do Sul logged 9,729 confirmed chikungunya cases (out of 12,735 probable) in 2026, with 28 deaths across nine municipalities and 114 cases in pregnant women; dengue saw 1,828 confirmed cases and one死 15 sources. https://clstr.news/cluster/mato-grosso-do-sul-mandates-cattle-brucellosis-vaccination ### 2026-07-23: Mato Grosso do Sul records 9,686 confirmed chikungunya cases Mato Grosso do Sul's bulletin reports 9,686 confirmed chikungunya cases, 28 deaths, plus dengue data and ongoing vaccination efforts. 27 sources. https://clstr.news/cluster/brazil-prison-overcrowding-deepens-in-minas-gerais-and-mato-grosso --- Cite as: Chikungunya outbreak and vaccine developments in MS. CLSTR, https://clstr.news/situations/mato-grosso-do-sul-chikungunya-outbreak-2026