However, it should be noted that there are three types Covid-19 vaccine, that is Pfizer, Modern and Johnson & Johnson who still showed signs of a strong immune response up to 8 months after injection without booster vaccine.
This is revealed in a study in the New England Journal of Medicine. Further in the study, the researchers found signs that suggest all three vaccines produce strong and long-lasting protection from the risk of disease severity.
The analysis also hints at differences in the way vaccines produce antibody. Antibodies from Pfizer and Modern soared and then descended rapidly, temporarily antibody Johnson & Johnson is more stable over time.
“In the eighth month, response antibody comparable for these three vaccines,” said Director of the Center for Virology and Vaccine Research at Beth Israel Deaconess Medical Center, Dr. Dan Barouch as quoted from Abc News, Sunday, October 17, 2021.
In fact, these two technologies trigger different types of immune responses, as quoted Pikiran-Rakyat.com from the Antara page.