immunity gap

Noun

 * 1)  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.
 * 2)  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.
 * 1)  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.
 * 1)  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.
 * 1)  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.