She had been coughing for two weeks; she had coughed so badly that her contractions started early.
She did so. But that physician listened to her lungs, she says, and then dismissed the possibility. Whooping cough was a disease of the past, the San Francisco woman recalls the doctor saying.
The doctor told her to keep breast-feeding and to wash her hands and gave her some inhalers to control lung spasms caused by what was believed to be a cold.
Two weeks later, Dylan was dead. He was 17 days old.
An autopsy found that Dylan died of a massive infection of the bacterium Bordetella pertussis, which causes whooping cough. Bianchi said she infected both Dylan and her older son, Cole, then 31/2. Cole too became seriously ill but survived.
Bianchi, a critical care nurse in San Francisco, doesn't know when, or from whom, she contracted the disease, only that she had been vaccinated as a child.
"It happened so fast," she says.
The death of Bianchi's son highlights one of the chief problems confronting California health officials trying to stem a current upswing in the disease: Whooping cough is easily misdiagnosed, especially in its early stages.
The disease is both highly infectious and can quickly kill infants exposed to it. Four newborns, all younger than 3 months, have died in California so far this year, an alarming number to health officials because it already exceeds last year's total of whooping cough-related deaths, three.
Bianchi encountered a variety of doctors and medical personnel in the latter days of her pregnancy — when she'd already developed a cough. Dylan encountered others after he was born. Only one, it seemed, suspected that his mother had pertussis. But even that suspicion failed to elicit corresponding preventive or treatment measures.
Newborns, or infants younger than 3 months, can have deceptively mild pertussis symptoms: a runny nose, an undetectable or mild cough, and generally no fever, said Dr. James D. Cherry, a UCLA pediatrics professor and a pertussis expert. But they can deteriorate rapidly.
They can begin to cough so much that they fail to get enough oxygen. Pneumonia can set in. The bacterium itself releases a toxin that can raise white blood cell levels so high that they begin to clog blood vessels, interfering with the body's ability to bring oxygen into the blood.
The organs can then start to fail.
Most infants contract the disease from family members, usually the mother, health experts say. But the disease is frequently missed in adults. Many doctors have the mistaken belief that grownups simply don't have whooping cough.
"I'll give a talk somewhere and people will say, 'Oh, adults don't get pertussis,'" Cherry said. Instead, physicians often end up ordering unnecessary X-rays and body scans in an attempt to diagnose symptoms that, to them, seem puzzling.
Many adults believe they're immune, having been vaccinated against the disease as a child. But immunity to whooping cough can begin fading five years after an inoculation.