Group of people including an older person, pregnant woman, child, and baby.

... this barrier against pathogens. The same goes for people with compromised immune systems, such as those with HIV/AIDS, cancer, liver disease and diabetes. "Not only are their immune systems weakened by the disease," Klontz says, "but the side ...

http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm354783.htm