Subjects: IMMUNIZATION; PLACENTA; MATERNALLY acquired immunity
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Subjects: RESPIRATORY infections; COVID-19 pandemic; RESPIRATORY syncytial virusECUADOR
Subjects: DIAGNOSIS of bacterial diseases; VIRAL disease diagnosis; BORDETELLANEW York (State)
Subjects: RESPIRATORY syncytial virus infections; HUMAN metapneumovirus infection; EPIDEMIOLOGY
Subjects: INFLUENZA viruses; SEASONAL influenza; RESPIRATORY infectionsQUITO (Ecuador); ECUADOR