Between late 2025 and early 2026, a sustained increase in chikungunya cases has been observed in countries and territories of the Region of the Americas, as well as the resumption of autochthonous transmission in areas where the virus had not been circulating for several years. In this context, the Pan American Health Organization / World Health Organization (PAHO/WHO) urges Member States to strengthen epidemiological and laboratory surveillance, ensure early detection and appropriate clinical management of cases, and consolidate integrated vector control actions, in order to limit transmission and reduce associated morbidity and mortality.

Bolivia, Brasil, Paraguay, Guayana, Guayana Francesa, Suriname

The Nipah virus, which can be lethal and for which there is no vaccine or antiviral treatment, has resurfaced in India, forcing 190 people to be placed under surveillance, as well as control measures in other Asian countries.

India

CAPE TOWN, South Africa (AP) — South Africa declared a national disaster Sunday over torrential rains and floods that have killed at least 30 people in the country’s north, damaged thousands of homes and washed away roads and bridges.

Sudáfrica

The cases were identified through the National Network of Laboratories and Sentinel Units and confirmed by the National Reference Laboratory of INEI-ANLIS using genomic sequencing techniques. They involve two adolescents, studied as part of the Outpatient Monitoring Strategy for Acute Respiratory Infections in the province of Santa Cruz, and a child who had been hospitalized in the Autonomous City of Buenos Aires. All patients experienced the illness without complications.

Argentina

Europe is experiencing an early and intense flu season, driven mainly by the H3N2 variant (subclade K). The United Kingdom, Spain, Italy, France, and Germany are reporting a significant increase in cases, putting greater pressure on hospitals and healthcare centers. European health authorities recommend strengthening preventive measures: influenza vaccination, proper indoor ventilation, mask use in enclosed spaces, and good hand hygiene.

This Saturday, the National Ministry of Health published an official bulletin announcing a national health alert for measles following the diagnosis of a two-year-and-four-month-old child in the municipality of Santa Elena, Entre Ríos. This case triggered the epidemiological alert, which calls for strengthened surveillance, vaccination, and early consultation at the first sign of symptoms. This comes within an international context in which the Americas region is no longer measles-free, having lost its status as free of endemic transmission.

Argentina