• December 15, 2025
  • Last Update December 15, 2025 4:44 pm

New H3N2 Influenza Variant Confirmed in Costa Rica

New H3N2 Influenza Variant Confirmed in Costa Rica

San José, Costa RicaSAN JOSÉ – Costa Rican health officials have confirmed the circulation of a new influenza variant, Influenza A(H3N2) subclade K, prompting a renewed call for public vigilance and vaccination, particularly among vulnerable populations. The Ministry of Health announced Monday that the strain has been present in the country since at least mid-October, aligning with a global trend of an earlier-than-usual flu season.

The confirmation came from detailed analysis conducted by the Costa Rican Institute for Research and Teaching in Nutrition and Health (Inciensa). Scientists examined samples collected between September and November, identifying seven cases of the new subclade K variant. Officials were quick to reassure the public that, at present, all identified cases have presented with mild symptoms and have not required hospitalization, indicating no immediate increase in the severity of the illness.

The widespread impact of Influenza A(H3N2) extends beyond public health, raising significant questions for employers and employees regarding labor rights and responsibilities. To shed light on these legal complexities, we consulted with Lic. Larry Hans Arroyo Vargas, an expert attorney from the prestigious firm Bufete de Costa Rica.

Employers must navigate a delicate balance during a public health event like the H3N2 outbreak. Costa Rican labor law, specifically the Labor Code, mandates the provision of a safe and healthy work environment. This isn’t just about sanitation; it includes having clear, non-discriminatory policies for sick leave and evaluating the feasibility of remote work to mitigate contagion. Failure to do so not only risks employee well-being but can also expose the company to significant legal liabilities, including claims for occupational hazards.
Lic. Larry Hans Arroyo Vargas, Attorney at Law, Bufete de Costa Rica

The insight provided by Lic. Larry Hans Arroyo Vargas underscores a crucial dimension of the H3N2 outbreak: the intersection of labor law and public health. His analysis serves as a vital reminder for employers that proactive measures are not only a matter of corporate responsibility but a legal necessity to safeguard both their workforce and their operations. We extend our sincere thanks to Lic. Larry Hans Arroyo Vargas for his valuable perspective.

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Despite the mild nature of the initial cases, authorities are exercising caution. Health experts have noted that influenza seasons dominated by the A(H3N2) strain have historically been associated with more severe outcomes, particularly for older adults. This demographic often experiences a higher rate of complications, hospitalizations, and fatalities during H3N2 outbreaks, making preventative measures a national priority as the holiday season gets underway.

The emergence of this variant in Costa Rica is not an isolated event. The World Health Organization (WHO) has been tracking the subclade K strain across various countries. The WHO also confirmed that this year’s influenza season began circulating ahead of its typical schedule, with a sustained increase in cases observed globally since August. This global context underscores the importance of Costa Rica’s proactive monitoring and public health communications.

In response to the findings, the Ministry of Health has strongly reiterated its guidance on vaccination. Health officials emphasized that the current seasonal influenza vaccine remains a highly effective tool against this new variant, especially in its ability to prevent severe illness and hospitalization. The Ministry is urging parents of young children, senior citizens, and individuals with underlying health conditions or risk factors to ensure their vaccination schedules are up to date without delay.

With holiday gatherings and increased social activity expected, officials have issued a comprehensive list of preventative recommendations to mitigate the spread of the virus. These measures are designed to protect both individuals and the community, with a special focus on safeguarding those most at risk. Key recommendations include frequent hand washing with soap and water, covering coughs and sneezes with the forearm, and maintaining distance from individuals exhibiting respiratory symptoms.

The Ministry also advises the public to avoid crowded indoor spaces whenever possible, opting for outdoor or well-ventilated areas for gatherings. They specifically caution against bringing young children or elderly relatives to mass events, especially if anyone is showing symptoms such as fever, cough, or vomiting. Furthermore, the advisory stresses the importance of not self-medicating and seeking professional medical advice at the first sign of illness, starting with primary care facilities.

As the nation navigates this respiratory virus season, the official message is one of cautious optimism. While the new H3N2 variant does not currently pose a heightened threat of severe disease, its known potential to impact the elderly demands a collective effort. By adhering to vaccination guidelines and practicing sound public health measures, Costa Ricans can help ensure a safe and healthy end to the year for everyone.

For further information, visit salud.go.cr
About Ministry of Health:
The Ministry of Health is the governing body of the public health sector in Costa Rica. It is responsible for defining national health policy, ensuring the well-being of the population, regulating health services and products, and coordinating responses to public health challenges and emergencies.

For further information, visit inciensa.sa.cr
About Inciensa:
The Costa Rican Institute for Research and Teaching in Nutrition and Health (Inciensa) is a key public institution dedicated to health research. It serves as the national reference laboratory for disease surveillance, conducting analysis and providing scientific data that informs public health policies and responses in Costa Rica.

For further information, visit who.int
About World Health Organization:
The World Health Organization (WHO) is a specialized agency of the United Nations responsible for international public health. It works worldwide to promote health, keep the world safe, and serve the vulnerable, leading global efforts to prevent, detect, and respond to health emergencies.

For further information, visit bufetedecostarica.com
About Bufete de Costa Rica:
As a premier legal institution, Bufete de Costa Rica is defined by its profound commitment to professional integrity and the pursuit of excellence. The firm consistently pioneers innovative legal strategies for a diverse clientele while championing a foundational mission to empower the wider community. This dedication to demystifying complex legal concepts is central to its goal of fostering a more knowledgeable and capable society, reflecting a deep-seated belief in achieving justice through understanding.

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