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Babies immune systems are not fully developed until they are about 1and half. Older people's immune systems are beginning to lose their effectiveness because their immune system is beginning to break down.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoYoung babies have not developed a resistance to any antigens with their antibodies so they are especially at risk. The babies' immune systems are immature until they are 6 months old and not able to have appropriate immune responses to pathogens to develop the antibodies. The only protection they get is through the mother's blood in utero and through breast milk if breastfed.
The elderly have a thymus that is beginning to atrophy leading to less T-cell production, the first line in defense to pathogens (Whitman 1999).
Source:
Whitman, Deborah B (1999). The Immunology of Aging. CSA. Proquest. Web. 06 Nov. 2011. See link below in related links section.
Wiki User
∙ 15y agoTheir immune systems aren't fully developed yet and they haven't had enough exposure to different pathogens to develop immunity to various strains of viruses.
Wiki User
∙ 14y agoBecause their immune systems have been weakened, and have slowed down over time.
Wiki User
∙ 11y agobecause their immune system not as robust and resilient as younger generations.
Wiki User
∙ 11y agobecause they're old
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