It persists, in large part, due to continual changes in the sequence of amino acid «building
blocks» that make up the viral protein hemagglutinin, enabling it to avoid
recognition and removal by
immune system antibodies.
«For instance, efforts to
block the infection - enhancing activity of these semen amyloids for STD prevention must now consider the potential effects of such interventions on sperm quality and
immune recognition of male antigens.»