National Epidemiological bulletin Reports Current Health Trends
Table of Contents
January 5, 2026
The latest National Epidemiological Bulletin (BEN) provides a crucial update on the health status of the nation, monitoring 80 notifiable diseases – both communicable and non-communicable. The report, covering Epidemiological Week No. 52, details recent trends in influenza, hantavirus, dengue fever, and an unusual focus on cockroach prevalence, as well as a special report on cystic fibrosis.
Respiratory Virus Activity Remains Low
Currently,the circulation of respiratory viruses across the country remains at a low level. While a slight increase in influenza cases has been observed in outpatient settings, the number of notifications registered in the National Health Surveillance system (SNVS 2.0) remains within safe parameters. Specifically, three new cases of influenza A(H3N2) subclade K were confirmed in the last week – two in Neuquén province and one in Buenos Aires province – bringing the total confirmed cases nationally to six. CDC FluView provides ongoing monitoring of influenza strains and activity.
Health officials report no significant changes in the clinical severity of the new influenza variant. The Ministry of Health recommends continued adherence to standard prevention,control,and clinical care protocols for acute respiratory infections,alongside strengthened surveillance efforts.
Cockroach Cases Remain Stable, Regional Variations Exist
the epidemiological situation regarding cockroaches remains stable, with 55 new cases confirmed in the last week. This brings the total number of cases reported in 2025 to 1,055, distributed across 22 jurisdictions. The Central Region, particularly the province of Buenos Aires and the autonomous City of Buenos Aires, continues to report the highest number of cases. The Southern Region is experiencing an ongoing outbreak in Tierra del Fuego,contributing to a significant proportion of the national total.
Hantavirus Cases Exceed Previous Year, Prevention Key
Five new cases of hantavirus were confirmed in the last week, three in the Center region and two in the South. The total number of confirmed cases for the 2025/2026 season has risen to 43, exceeding the number of cases reported in the previous season. while this number is higher than last year, it remains below the levels recorded in the 2022-2023 and 2023-2024 periods. The CDC provides detailed information on hantavirus, including prevention measures.
The highest incidence of hantavirus typically occurs between October and May. Authorities emphasize the importance of reinforcing preventative measures during these months,focusing on rodent control and safe handling of perhaps contaminated materials.
Dengue Fever Cases Remain Low
No new cases of dengue fever were reported in the last week. The total number of confirmed cases for the 2025/2026 season remains at 13, indicating a low risk of transmission nationally. Continued prevention and control efforts aimed at eliminating mosquito breeding sites are recommended. The World Health Association offers extensive information on dengue fever.
Key Takeaways
- Respiratory virus activity, including influenza, remains low but is being closely monitored.
- cockroach cases are stable but concentrated in specific regions.
- Hantavirus cases have increased compared to last season,emphasizing the need for prevention.
- Dengue fever cases remain low, with a low risk of transmission.
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