Puerto Rico Declares Flu Epidemic: Cases, Deaths & Vaccination Info (2026)

Puerto Rico is currently facing a significant influenza outbreak, officially declared an epidemic by the island’s Department of Health (DS) on Tuesday. This declaration follows six consecutive weeks of influenza cases exceeding established epidemiological thresholds.

Rising Cases and Public Health Response

The increase in reported cases during the 2025/2026 season prompted the DS to take action. Secretary of Health, Víctor M. Ramos, emphasized the need for immediate public response, stating that influenza “can occasion a serious and complicated health condition.” The primary defense, according to the DS, is prevention through vaccination, hygiene practices, and self-isolation when symptoms appear.

Did You Know? To declare an influenza epidemic, Puerto Rico must experience case numbers above the established threshold for six consecutive weeks.

As of the second epidemiological week (January 11-17, 2026), a total of 42,183 influenza cases had been reported. A substantial portion of these cases – approximately 46.4% – are occurring in the pediatric population. The health authorities have also reported 3,001 hospitalizations and 128 deaths associated with the influenza virus.

Vaccination as a Key Preventative Measure

Data reveals a strong correlation between vaccination status and severe outcomes. An overwhelming 96.1% of those who died from influenza-related complications had not been vaccinated. This underscores the critical role of immunization in preventing severe illness and death.

The municipalities reporting the highest number of cases are Ponce (8,392), Caguas (8,179), and Bayamón (7,111). The overall incidence rate across Puerto Rico is currently 1,309 cases per 100,000 inhabitants.

Expert Insight: The high percentage of unvaccinated individuals among those who died highlights the potential for preventable loss of life during an epidemic. Public health messaging emphasizing vaccination is crucial, particularly given the demonstrated severity of illness and the availability of preventative measures.

The DS outlined a strategic response to the epidemic, focusing on detection, surveillance, vaccination, treatment, community outreach, and public education. Miriam V. Ramos, the principal epidemiologist of Puerto Rico, stated that the agency is continuously monitoring the spread of influenza through various surveillance systems, including wastewater and syndromic surveillance.

To date, 365,508 influenza vaccines have been administered across Puerto Rico during the 2025/2026 season. The Secretary of Health reiterated the importance of preventative measures such as frequent handwashing, covering coughs and sneezes, avoiding close contact with sick individuals, and wearing masks in crowded places.

Frequently Asked Questions

What are the symptoms of the influenza?

Symptoms of the influenza include fever or feeling feverish, chills, cough, sore throat, runny or congested nose, muscle or body aches, headache, fatigue, and, in some cases, vomiting or diarrhea.

What is being done to monitor the spread of influenza?

The Puerto Rico Department of Health is maintaining continuous monitoring of influenza transmission through multiple surveillance systems, including wastewater surveillance and syndromic surveillance.

How many vaccines have been administered this season?

As of this report, 365,508 influenza vaccines have been administered throughout Puerto Rico during the 2025/2026 season.

As the epidemic continues, public health officials may consider expanding vaccination efforts, increasing public awareness campaigns, or adjusting treatment protocols. The trajectory of the outbreak will likely depend on factors such as vaccination rates and adherence to preventative measures.