Three Rotavirus Outbreaks in the Postvaccine Era — California, 2017

Rachel M. Burke, PhD; Jacqueline E. Tate, PhD; Nora Barin, MPH; Carly Bock; Michael D. Bowen, PhD; David Chang, MD; Rashi Gautam, PhD; George Han, MD; John Holguin, MPH; Thalia Huynh; Chao-Yang Pan, MPH; Rebecca Quenelle, MPH; Catherine Sallenave, MD; Cindy Torres; Debra Wadford, PhD; Umesh Parashar, MBBS


Morbidity and Mortality Weekly Report. 2018;67(16):470-472. 

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Outbreak 2: Adult Assisted Living and Memory Care Facility in San Mateo

In early April 2017, the San Mateo County Division of Public Health, Policy, and Planning was notified of an outbreak of AGE at an assisted living and memory care facility housing 44 residents and employing 40 staff members. San Mateo health officials recommended standard control measures for gastrointestinal illness outbreaks (e.g., isolation and cohorting, contact precautions, suspension of group activities, promotion of handwashing, and disinfection with bleach solution or a disinfectant approved by the Environmental Protection Agency [EPA] as effective against norovirus). By April 10, 2017, nine cases had been reported, including four among residents and five among staff members. Symptom onset dates occurred during March 31–April 6, 2017. All nine patients had diarrhea, two reported abdominal cramps, and one had vomiting. Patient age ranged from 22 to 90 years (median age = 47 years); no patients were eligible to have received rotavirus vaccine. At least one patient sought primary care; no hospitalizations or deaths were reported. As in the first outbreak, norovirus was initially suspected, but two stool specimens tested at the county public health laboratory were norovirus-negative. These specimens were then sent to CDPH VRDL for additional testing, where they were both found to be rotavirus-positive by RT-PCR; they were later genotyped as G12P[8] by CDC.