11 Cases of Swine Flu in Costa Rica With 3 Deaths
First reported January 27, 2012 · Updated October 28, 2026
January 27, 2012 | Costa Rica
Costa Rica’s health authorities are responding to a renewed wave of influenza A(H1N1) infections in January 2012. A report circulating on January 27 attributes 11 confirmed infections and three deaths over approximately three weeks to the Ministry of Health. Those figures describe a specific reporting window, not the country’s cumulative experience with the virus. The precise 11-and-three tally has not been independently verified against a surviving Ministry bulletin.
The cases are a reminder that the H1N1 strain associated with the 2009 global influenza pandemic did not disappear when the initial emergency subsided. The virus continued circulating, and public health surveillance remained important for distinguishing influenza from other respiratory infections.
What the January reports said
The contemporaneous account identified the Health Surveillance Directorate, led by María Ethel Trejos Solórzano, as the source of an alert about infections and severe outcomes. It described patients across a broad age range and reported illness in parts of the greater San José region and other communities. These are reported locations, not a verified map of active transmission or proof that particular neighborhoods were responsible for the infections.
The Ministry was urging practical prevention measures, including handwashing, respiratory hygiene and seasonal influenza immunization. Such measures were particularly relevant because severe influenza can develop in people with underlying medical conditions, though serious illness is not limited to any single age group.
Another contemporary report, posted earlier in the month, cited a different count: one death and eight H1N1 infections at that point, while also noting infections from other seasonal influenza viruses. The numbers may reflect changing dates, diagnostic categories or surveillance definitions. They should not be treated as a single consistent running total without the original laboratory reports.
H1N1 after the pandemic
The strain commonly called swine flu became internationally prominent in 2009. By 2012, Costa Rica was monitoring it through a broader system for influenza and severe acute respiratory infections. Tracking severe hospital cases was particularly useful because laboratory confirmation, illness and death counts do not always move together.
A later peer-reviewed study using Costa Rican hospital surveillance records examined influenza-associated admissions and deaths from 2009 through 2012. It separated the pandemic years from 2011 and 2012, treating the latter as seasonal-influenza surveillance. The study offers a firmer view of the longer trend than a single day’s headline count.
What happened next
Costa Rica’s surveillance data were subsequently analyzed in a study published in Emerging Infectious Diseases, using national records from 2009 to 2012. Its findings reinforced the value of ongoing influenza testing, especially among people hospitalized with severe respiratory illness. The study did not independently establish that the January 27 headline’s 11 cases and three deaths were the final figures for that month.
Questions and answers
Was H1N1 still present in Costa Rica in 2012? Yes. H1N1 continued to circulate after the 2009 pandemic and remained part of influenza surveillance.
Were there exactly 11 cases and three deaths nationwide? That was the figure in a contemporaneous report covering roughly three weeks. An independent official bulletin confirming the exact tally has not been located.
What did the health authorities recommend? Vaccination against seasonal influenza, hand hygiene and attention to respiratory symptoms were emphasized in contemporary coverage.