Covid-19 infections in Spain have more than doubled since the summer months, according to data from the Carlos III Health Institute (ISCIII). The increase, which began gradually in June, has led experts to describe the virus as becoming “almost endemic” in the population.
Health authorities and specialists are urging renewed vaccination efforts, particularly among older adults and vulnerable groups, to mitigate the spread as winter approaches.
Figures from ISCIII show that incidence rates rose from 46.6 cases per 100,000 inhabitants in mid-June to 99.3 cases during the week of September 15–21. The most recent report, updated to October 5, recorded 63.8 cases per 100,000 inhabitants, indicating a slight decline but continued circulation of the virus across Spain. While infection numbers remain far below pandemic peaks, experts emphasize the importance of maintaining preventive measures as Covid-19 stabilizes into an ongoing seasonal illness.
Gradual Increase Linked to Seasonal and Social Factors
Immunologist Rafael Toledo, professor of parasitology at the University of Valencia, explained that recent fluctuations are due to the lack of a major Covid-19 wave earlier in the year. Without a significant surge, most people have not renewed their immunity, leaving them more susceptible to infection when exposed to the virus. “The fact that there has not been a previous Covid peak has prevented most of the population from renewing their immunity,” said Toledo.
Toledo added that the rise coincides with the end of the summer holidays and the return to schools and workplaces, increasing interaction in enclosed spaces such as classrooms, offices, and public transport. “This period of greater contact indoors has contributed to the recent increase,” he noted. Despite the uptick, influenza activity remains low, with just 20.3 cases per 100,000 inhabitants reported in the same period, according to the latest health data.
The data suggest that while transmission is rising, hospital admissions have not followed the same trajectory. ISCIII’s latest report records 1.5 hospitalizations per 100,000 inhabitants due to Covid-19. Among those admitted, 29.4% developed pneumonia, 7.7% required intensive care, and 9.1% of hospitalized cases were fatal. These figures indicate that while the virus continues to circulate, it is causing fewer severe outcomes than in previous waves.
New Variants Under Surveillance
New coronavirus variants, including Stratus and Nimbus, have played a role in the current rise in infections. However, according to Manuel Muro, head of immunology at Virgen de la Arrixaca University Hospital, these strains are not associated with increased severity. “They increase transmissibility but do not cause more serious cases,” said Muro. “There is no reason for alarm or concern about them. More variants will continue to appear as the virus evolves.”
The World Health Organization (WHO) is already monitoring these variants, which share many symptoms with earlier strains such as Omicron. Typical signs include fever, headache, fatigue, sore throat, and, in some cases, hoarseness. Health professionals note that the current symptom profile remains manageable and that most infections are mild or moderate.
Experts agree that maintaining vaccination coverage is the most effective measure to prevent a surge in serious cases. Daniel López Acuña, former WHO director of health action in crisis situations, emphasized that immunization remains the strongest defense. “If we want to avoid or mitigate a tripledemic this autumn-winter, we must vaccinate now,” said López Acuña. He noted that vaccination should focus on older adults and high-risk groups, including those with chronic illnesses.
Calls for Renewed Preventive Measures
Spanish health specialists continue to advocate mask use in high-risk environments. López Acuña recommended wearing masks in hospitals, clinics, and care homes and by anyone experiencing active respiratory symptoms. “If you have an active infection, it is essential to use a mask in large gatherings, enclosed spaces, and public transport,” he advised.
Experts attribute Spain’s lower hospitalization and mortality rates compared with earlier phases of the pandemic to widespread vaccination and prior exposure among the population. These factors have strengthened collective immunity, reducing the overall severity of infections even as transmission persists.
Health authorities are expected to maintain surveillance through ISCIII and regional systems as Covid-19 transitions into a recurring seasonal illness similar to influenza. The government continues to promote vaccination campaigns and public health messaging to prevent simultaneous outbreaks of Covid-19, influenza, and other respiratory viruses during the colder months.
Despite the upward trend in infections, experts stress that there is no cause for alarm. Both Toledo and Muro emphasized that Covid-19 is now largely manageable thanks to immunity levels and medical preparedness. However, they caution that complacency could lead to higher rates of infection and potential strain on health systems during winter. The current situation, they conclude, requires vigilance, vaccination, and adherence to basic preventive practices rather than strict restrictions.
As Spain approaches winter, its experience highlights a broader European trend: Covid-19 has become a persistent but less severe threat, demanding continued adaptation from public health systems and the public alike.
Photo Credit: cipta studio / Shutterstock.com
