Noun
an impermanent form of acquired immunity in which antibodies against a disease are acquired naturally (as through the placenta to an unborn child) or artificially (as by injection of antiserum)
Source: WordNetIf the mother has been vaccinated against tetanus, the infants acquire passive immunity and are thus protected. Source: Internet
In 1897, Edmond Nocard showed that tetanus antitoxin induced passive immunity in humans, and could be used for prophylaxis and treatment. Source: Internet
This passive immunity is usually short-term, lasting from a few days up to several months. Source: Internet
Nine out of 10 mothers feel breast milk contains antibodies that are transferred to the baby, and once breast-fed they have passive immunity for a longer time. Source: Internet
The passive immunity passed on from the mother at birth also doesn’t last long and diminishes within a few weeks and months after birth. Source: Internet