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​​Gradient Strip (GC Etest) Neisseria gonorrhoeae Antimicrobial Susceptibility Testing Services at the Microbial Diseases Laboratory

​Effective 06/26/2023, the California Department of Public Health’s (CDPH) Microbial Diseases Laboratory (MDL) will​ offer Neisseria gonorrhoeae antibiotic susceptibility testing (AST) for azithromycin, ceftriaxone and cefixime using bioMérieux Etest® gradient strip. In the future, ciprofloxacin will be added to the AST panel and information will be added to the Test Information Sheet.

Please go to Gradient Strip (GC ETest) ​​​Neisseria gonorrhoeae Anti​microb​ial Susceptibility Testing FAQ​​ and Test Information Link for acceptance criteria and submission instructions. Test information can be found on our webpage: ​​MDL Services and Test Catalog.

​Additional information on antibiotic-resistant N. gonorrhoeae is available from the CDPH Sexually Transmitted Disease Control Branch (STDCB) at the STDCB Antibiotic Resistant Gonorrhea Center of Excellence webpage, including gonorrhea treatment guidelines and management of suspected treatment failure:  

Ke​y Con​​​​​tac​t​​​​ Info​​rm​​ation: ​

​​Etest, Gradient Strip Neisseria gonorrhoeae AST:
MDL Bacterial Diseases Section (BDS) Laboratory: (510) 412-3903

CDPH STD Control Branch: 
Phone: (510) 620-3400

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