Children since the beginning of the pandemic have proven to be the most resistant group to the effects of COVID-19. A study by the Complutense University of Madrid has shown that the vaccine for diphtheria, tetanus and pertussis (DPT) that is administered to children could generate a cross immunity that protects children against COVID-19
The article, published in the journal Frontiers in Immunology and signed by the immunologist Pedro Reche, indicates the existence of extensive cross-immunity between the COVID-19 virus and antigens present in the DPT vaccine (Diphtheria, Tetanus and Pertussis). This vaccine is applied during the first year of life with a booster at 4-6 years and a low antigenic load dose at 9-14 years, being able to induce a strong immune memory with cross-reactivity against the virus.
Apparently, said immunity declines over time, correlating with the severity that COVID-19 shows as the age increases in patients, reaching its maximum in the geriatric population.