Chikungunya Outbreak in Salta: Rising Cases and Babies Born Infected

Health authorities in Salta, Argentina, have reported a significant increase in Chikungunya cases, with the outbreak now including confirmed instances of vertical transmission from pregnant women to their newborns.

As of May 9, 2026, official records indicate that 1,632 cases of the virus have been registered in the province. Among these, at least six infants were born with the virus, having been infected during pregnancy.

The surge in infections is concentrated in specific regions of the province. The department of San Martín has been the most severely impacted, recording more than 1,000 contagions.

Other areas experiencing high transmission rates include Orán and Anta, where local health services are managing the spike in patients.

Chikungunya is a viral disease transmitted to humans by infected mosquitoes, primarily Aedes aegypti and Aedes albopictus. These are the same vectors responsible for spreading dengue and Zika viruses.

The illness is characterized by a sudden onset of fever and severe joint pain, which can be debilitating and persist for weeks or months after the initial infection.

While most cases of Chikungunya are self-limiting, the occurrence of congenital transmission represents a serious public health concern. Vertical transmission typically occurs when a mother is viremic at the time of delivery.

Newborns infected with the virus may experience a range of symptoms, including joint swelling, skin rashes and in severe cases, neurological complications or respiratory distress.

Public Health Context and Vector Control

The increase in cases in Salta aligns with broader regional patterns where climate conditions and urban environments facilitate the breeding of Aedes mosquitoes.

Public health officials emphasize that the primary method of prevention is the elimination of mosquito breeding sites. This includes removing standing water from containers, tires, and flowerpots where mosquitoes lay eggs.

Health directives for the affected population include the use of insect repellents, the installation of screens on windows and doors, and the use of mosquito nets, particularly for pregnant women and those with weakened immune systems.

Medical professionals in Salta are monitoring pregnant women more closely to detect early signs of infection and ensure that newborns are screened for the virus upon birth.

There is currently no specific antiviral treatment for Chikungunya. Management focuses on relieving symptoms through hydration, rest, and the use of analgesics to manage joint pain and fever.

The concentration of cases in San Martín suggests a localized environmental or systemic factor contributing to the acceleration of the outbreak in that specific department.

Health authorities continue to track the spread of the virus across the province to determine if the transmission rate is stabilizing or if further interventions are required to protect vulnerable populations.