Participants between the ages of 10–86 years old were vaccinated with split-inactivated
influenza vaccine (Fluzone®) in six consecutive influenza seasons from 2016–2017 to 2021 …

Serum hemagglutination-inhibition (HAI) antibodies have been associated with protection
from influenza infection. HAI antibody responses to live attenuated influenza vaccines …

Most humans have pre-existing immunity to influenza viruses. In this study, volunteers (ages
of 18–85 years) were vaccinated with split, inactivated Fluzone™ influenza vaccine in four …

Several vaccines are approved in the United States for seasonal influenza vaccination every
year. Here we compare the impact of repeat influenza vaccination on hemagglutination …

Background: Concerns about influenza vaccine effectiveness in older adults and the role of
influenza strains encountered earlier in life led to this study. Methods: Antibody responses …

Influenza vaccines remain the primary public health tool in reducing the ever-present burden
of influenza and its complications. In seeking more immunogenic, more effective and more …

Background Seasonal influenza causes significant morbidity and mortality with a
disproportionately high disease burden in older adults. Strain-specific hemagglutination …

Background. Antibody to influenza virus hemagglutinin has been traditionally associated
with protection. Questions have been raised about its use as a surrogate for vaccine efficacy …

Pre-existing immunity to influenza is dependent on a number of factors and can vary greatly
within and across influenza subtypes. In this study, volunteers (aged 18–85 years) were …

Inactivated influenza vaccination induces a hemagglutinin-specific antibody response to the
strain used for immunization. Annual vaccination is strongly recommended for health care …