In an ongoing study from the Texas Biomedical Research Institute, experts have found that after vaccination, COVID-19 antibody levels vary by age and sex. The researchers also found that antibody levels drop significantly within six months across all individuals. The study participants were tested over the course of six months after receiving the Pfizer-BioNTech vaccine. The tests revealed that individuals under the age of 65 had more than twice the level of SARS-COV-2 antibodies than individuals 65 years and older. In addition, women had higher antibody levels...