COVID-19(29) SARS-CoV-2(19) Pregnancy(18) Infection(14) women(11) Vaccine(11) SARS-CoV-2.(11) pregnant women(8) pandemic(8) mother(7) variant(7) Evidence(7) antibody(7) virus(7) vaccination(7) antibodies(7) progression(7) Newborn(7) immune(7) clinical trials(7) SARS-COV-2 infection(7) group(7) COVID-19 vaccines(7) decrease(5) IgG antibody(4) Analysis(4) positive(4) population groups(4) off-label(4) COVID-19 disease(4)