SAN MATEO — Stanford Children’s Health this week confirmed that only eight vaccines — not 10 as originally believed — were compromised by a faulty refrigerator at a medical office affiliated with the health network.

Haemophilus influenzae type B and rotavirus were not affected by the refrigerator temperature malfunction discovered Sept. 21 at the Peninsula Pediatric Medical Group in San Mateo, said Samantha Dorman, a spokeswoman for Stanford Children’s Health.

But the following eight vaccines were jeopardized: whooping cough; polio; a single shot for whooping cough, Haemophilus influenzae type B and polio; meningitis; hepatitis A and hepatitus B; human papillomavirus, except doses given between Sept. 10 and Sept. 21; pneumococcal and flu.

Officials believe the refrigerator temperature problem could have started as far back as Jan. 14, when the new appliance was installed. So, doctors at the medical group say hundreds of pediatric patients will have to repeat their vaccinations.

Stanford Children’s Health said it mailed letters to patients’ families on Oct. 3 to alert them about the issue and help them arrange an appointment. If a patient or their family has not responded by a certain date, the medical group will re-contact them.

The vaccines will be free of charge, and the cost will not be billed to insurers.

As a result of this incident, Stanford Children’s Health said it is installing new refrigerators at the medical group’s office that will monitor temperatures around the clock and send alerts to the staff if there is any problem.

Contact Tracy Seipel at 408-920-5343. Follow her at

Which vaccines were possibly affected?
1. Whooping cough
2. Polio
3. Whooping cough, haemophilus influenzae type B, and polio (single shot)
4. Meningitis
5. Hepatitis A and hepatitis B
6. Human papillomavirus, except doses given Sept. 10 through Sept. 21
7. Pneumococcal
8. Flu
Source: Stanford Children’s Health