immunity gap noun2 •The time period during which a young mammal no longer receives effective immunity to diseases from antibodies in its mother's milk but its own immune system is not fully developed.The actual age at which the immunity gap develops depends on the amount of maternally derived antibody (MDA) transferred to each kitten. — 2008 •The time period between when an individual's or a population's immunity to a virus has waned (due to normal decrease in immune response over time or to the development of a new strain of the virus) and before a new vaccine can be given to boost immunity.However, an immunity gap in adults coupled with the presence of large numbers of susceptible children and adolescents creates the potential for an extensive epidemic. — 2009 formsimmunity gaps
