(CNN) - Rick Santorum's three-year-old daughter Isabella, who suffers from a chromosomal condition called Trisomy 18, is back in the hospital, his spokesman Hogan Gidley announced Friday.
"Rick and his wife Karen have taken their daughter Bella to the hospital," Gidley said in a statement. "The family requests prayers and privacy as Bella works her way to recovery."
Update: Santorum to resume campaigning Tuesday after daughter's hospitalization
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Better known as "Bella," Santorum's daughter was hospitalized with pneumonia in January, prompting the candidate to cancel campaign events shortly before Florida's Republican primary.
Trisomy 18 is caused by extra material from chromosome 18, and is three times more common in girls than boys. Half of patients born with the condition do not survive past the first week of life, according to the National Institutes of Health. Patients who do survive past the first week experience serious medical and developmental problems.