There used to be some passive immunity from the mother, but few people under age 50 have had the disease.

However, passive immunity lasts only for a few weeks or months.

There are several diseases where an individual is born with a passive immunity from its mother.

This passive immunity is usually short-term, lasting from a few days up to several months.

Antiserum is used to pass on passive immunity to many diseases.

These antibodies provide passive immunity to the fledgling and are critical to its survival.

Infants who have not acquired passive immunity because the mother has never been immunized are at risk.

A newborn baby acquires passive immunity from its mother through the placenta.

Passive immunity is temporary, because the antibodies which are transferred have a lifespan of only about 3-6 months.

Interestingly, insects, along with having passive immunity, also show evidence of acquired immunity.

The antibodies in colostrum provide passive immunity, while growth factors stimulate the development of the gut.

Passive immunity is provided when a person is given antibodies to a disease rather than producing them through his or her own immune system.

This is passive immunity because the fetus does not actually make any memory cells or antibodies-it only borrows them.

These diseases are often treated by inducing a short term form of immunity called passive immunity.

Short-term passive immunity can also be transferred artificially from one individual to another via antibody-rich serum.

This enables passive immunity from milk.

It is rich in protein and antibodies that provide passive immunity to the baby (the baby's immune system is not fully developed at birth).

This approach seems especially apt for the development of anti-viral therapies that exploit the principles of passive immunity.

Passive immunity provides immediate protection, but the body does not develop memory, therefore the patient is at risk of being infected by the same pathogen later.

Natural passive immunity.

In passive immunity the desired antibody titers are achieved by injecting antibodies directly into an animal.

Artificially initiated passive immunity.

This is the major advantage to passive immunity; protection is immediate, whereas active immunity takes time (usually several weeks) to develop.

Passive immunity is the transfer of active immunity, in the form of readymade antibodies, from one individual to another.

When the antitoxin is obtained from the blood, it is purified and injected into a human or other animal, inducing passive immunity.