The annual autumn vaccination campaign against influenza and COVID-19 has launched to combat winter epidemic peaks. These vaccines are updated yearly to address molecular variations in viruses that allow them to evade previous immunity or vaccinations.
The Spanish Ministry of Health notes that immunity takes several weeks to develop, with optimal protection reached two weeks after administration. Effectiveness depends on the match between vaccine strains and circulating viruses, plus individual health.
Vaccination is recommended for those over 65, pregnant women, and people with chronic illnesses to reduce severe complications. While vaccines do not prevent other winter viruses like RSV, they can be safely administered together in different locations.