Retropharyngeal Abscess Caused by Community-Acquired MRSA USA300 Clone in a 1-Year-Old Japanese Girl

Eiki Ogawa, Kensuke Shoji, Yuki Uehara, Isao Miyairi

Research output: Contribution to journalComment/debatepeer-review

1 Citation (Scopus)


We describe a domestic case of retropharyngeal abscess (RPA) in a child caused by a community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) isolate that was genetically proven to be the USA300 clone (sequence type [ST]8-SCCmec IVa-Panton-Valentine leukocidin [PVL]). USA300 generally has a PVL gene, an epidemiologic association with severe and recurrent skin and soft tissue infection, and is the leading cause of RPA in the United States. A 1-year-old previously healthy girl visited the emergency department with fever, sore throat, and a difficulty in moving her neck. The patient had no recent medical exposure or history of travel abroad. Enhanced computed tomography revealed a bulky low-density area with ring enhancement in the retropharyngeal and right parapharyngeal spaces. MRSA was isolated from pus obtained from surgical drainage, and antibiotics were continued for a total of 21 days. MRSA was analyzed by whole genome sequencing and compared with representative USA300 isolates. The strain was typed as ST8-t9829-SCCmec IVa with PVL and arginine catabolic mobile element, and its sequence was 99.8% identical to USA300 isolates. The present case supports the possibility that USA300 is potentially spreading in the Japanese community and raises the possibility of USA300 invasive infections without a clear route of infection.

Original languageEnglish
Pages (from-to)403-406
Number of pages4
JournalJapanese journal of infectious diseases
Issue number4
Publication statusPublished - 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)
  • Infectious Diseases


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