It can lead to a lack of energy, weakened immune systems and delayed periods.
People at risk include infants, pregnant women, adults with weakened immune systems and older adults.
At risk groups include the over-65s, pregnant women, people with weakened immune systems and other health conditions.
However, it can cause serious harm to vulnerable hospital patients with weakened immune systems, such as premature babies.
This meant that they posed a more profound threat, particularly to the growing number of patients with weakened immune systems.
Salmonella can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems.
Salmonella is an organism that can cause serious and sometimes fatal infections in young children, elderly people or others with weakened immune systems.
She said children with weakened immune systems, such as those with cancer or leukaemia, could die if they come into contact with the disease.
BBC: NEWS | UK | England | South Yorkshire | Measles outbreak affects children
But toxoplasmosis - the disease in humans - can cause serious complications in people with weakened immune systems, such as those with HIV and cancer.
Dentists are advised to use sterile water for patients with weakened immune systems and for those who undergo surgery where the gum line is cut.
Laheij says patients should stop gobbling Prilosec like candy, especially those who are susceptible to pneumonia complications (the elderly and people with asthma or weakened immune systems).
If SARS takes root in Africa, hitting populations where AIDS has already weakened immune systems, it could exact a devastating death toll and set back economic development for decades.
In addition, HSV-2 infection can cause complications in people who have weakened immune systems due to chronic disease, and it can increase a person's likelihood of contracting HIV, Whitley says.
Under the programme put forward, people with health conditions, such as heart disease and diabetes, pregnant women, those with weakened immune systems and frontline health and social care workers will be the first to receive the jab.
They found that 48 percent of beverages obtained from soda fountains contained coliform bacteria, 11 percent contained E. coli (which are mostly harmless, but some can cause diarrhea, urinary tract infections, respiratory illness and pneumonia), and 17 percent had Chryseobacterium meningosepticum (which could sicken newborns or adults with weakened immune systems).
The American Academy of Pediatrics is now recommending that children who have potentially been exposed to rabies receive four shots in two weeks. (Children with weakened immune systems should continue to receive the five-shot regimen, the group says.) This recommendation affirms a set of 2010 guidelines for all ages from the Centers for Disease Control and Prevention.
The patients were often children whose immune systems had been weakened by chemotherapy, which left their wounds from surgery vulnerable to infection.
The drug and a later version that requires less frequent doses, Neulasta, prevent nasty infections in cancer patients whose immune systems have been weakened by chemotherapy.
Recently, Genentech and Biogen revealed that patients taking Rituxan had come down with the same virus, which only afflicts people whose immune systems have become weakened.
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