(WGN-AM)- A Chicago woman became the fourth person in the state to die of the H1N1 swine flu a day after she gave birth, officials said Wednesday.

The latest death was a 20-year-old woman from Chicago who died Saturday at the University of Illinois Medical Center, said Sherri McGinnis Gonzalez, a hospital spokeswoman.

The woman was admitted to the hospital May 23 with flulike symptoms. Her condition quickly deteriorated, and her baby, a 27-week fetus, was delivered by Caesarean section on Friday, officials said.

The woman died the following day and was found to have pneumonia and swine flu, McGinnis Gonzalez said. The baby is being cared for in the hospital's neonatal intensive care unit, she said.

Health officials said that in addition to the latest death, three people -- a 22-year-old Chicago man, a northwest suburban Cook County woman and a 42-year-old Kane County man -- have died of swine flu. All four who died had other underlying medical conditions, officials said.

There are 1,268 confirmed swine flu cases in Illinois, officials said. The Centers for Disease Control and Prevention's Web site lists 11,054 confirmed and probable cases in the U.S.

(The Chicago Tribune contributed to this story)

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