Elderly people, kids, and those with compromised immune systems are at particular risk with the flu.

FORBES: How To Stay Safe From The Flu At Work This Year

The FDA says people particularly at risk from the potential dangers of unpasteurized fresh juice are children, the elderly, and those with compromised immune systems.

CNN: FDA to make juices safer from E. coli

Persons with compromised immune systems are most at risk.

FORBES: A Giant Shucking Sound

Versicor brought to the table a host of interesting programs early in the research pipeline and an antifungal drug, anidulafungin, which is now being evaluated by the FDA to treat invasive fungal infections that can damage the internal organs of patients with already compromised immune systems.

FORBES: Building An Antibiotic Powerhouse

Four of the six people who died had underlying illnesses that compromised their immune systems, making them more susceptible to severe side effects of salmonella infection.

CNN: Kellogg to recall products over salmonella concerns

D. were infected not with one pathogen but with many, and the most economical explanation was that their immune systems were compromised.

NEWYORKER: Stung

Diabetics who are infected with TB become ill with the disease at three times the ratio of the general population because their immune systems are compromised, said Dr. Seaworth, who is also a professor of medicine at the University of Texas Health Science Center-Tyler.

WSJ: TB's Global Resurgence Amplifies U.S. Risk