CD4 and COVID-19: Two other studies analyzed the immunogenicity of COVID-19 in pregnant women and fetuses, and COVID-19 vaccines overall are approximately 90% effective for the vaccinated women.194,195 R Collier et al. analyzed the immune condition of pregnant or lactating women and fetuses after COVID-19 vaccination.194 Both pregnant and lactating women could produce binding, neutralizing, and functional non-neutralizing antibodies, accompanied by CD4+ and CD8+ T-cell responses.