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On February 11, 2020 the World Health Organization announced an official name for the disease that is causing the current outbreak of coronavirus disease, COVID-19. CDC will be updating our website and other CDC materials to reflect the updated name.

Interim Laboratory Biosafety Guidelines for Handling and Processing Specimens Associated with Coronavirus Disease 2019 (COVID-19)

Summary of Recent Changes

Revisions were made on February 10, 2020, to reflect the following:

  • The term “certified” was added to clarify that a certified Class II Biological Safety Cabinet (BSC) should be used for any laboratory procedure with the potential to generate aerosols or droplets.
  • Additional details were provided for any laboratory procedures that are performed outside of a BSC.
  • Additional details were provided about the use of EPA-registered hospital disinfectants.
  • Additional details were provided for handling COVID-19 laboratory waste.
  • The need for both site- and activity-specific risk assessments was added to determine if additional laboratory biosafety control measures are necessary.

February 10, 2020

Until more information becomes available, precautions should be taken in collecting and handling specimens that may contain SARS-CoV-2. Timely communication between clinical and laboratory staff is essential to minimize the risk incurred in handling specimens from patients with possible SARS-CoV-2 infection. Such specimens should be labeled accordingly, and the laboratory should be alerted to ensure proper specimen handling. General and specific biosafety guidelines for handling SARS-CoV-2 specimens are provided below.

For additional detailed instructions please refer to the following:

General Guidelines (for working with potentially infectious materials)

Laboratory workers should wear appropriate personal protective equipment (PPE) which includes disposable gloves, laboratory coat/gown and eye protection when handling potentially infectious specimens.

Any procedure with the potential to generate aerosols or droplets (e.g., vortexing) should be performed in a certified Class II Biological Safety Cabinet (BSC). Appropriate physical containment devices (e.g., centrifuge safety buckets; sealed rotors) should be used for centrifugation. Ideally, rotors and buckets should be loaded and unloaded in a BSC. For any procedures outside of a BSC, eye and face protection (e.g. goggles, mask, face shield) or other physical barriers (e.g. splash shield) should be used to minimize the risk of exposure to laboratory staff.

After specimens are processed, decontaminate work surfaces and equipment with appropriate disinfectants. Use EPA-registered hospital disinfectants with label claims to be effective against other respiratory pathogens, such as seasonal influenza and other human coronaviruses. Follow manufacturer’s recommendations for use – dilution (i.e., concentration), contact time, and care in handling.

For SARS-CoV-2 laboratory waste, follow standard procedures associated with other respiratory pathogens, such as seasonal influenza and other human coronaviruses.

Specific Guidelines

Virus isolation in cell culture and initial characterization of viral agents recovered in cultures of SARS-CoV-2 specimens are NOT recommended at this time, except in a BSL3 laboratory using BSL3 work practices.

The following activities may be performed in BSL-2 facilities using standard BSL-2 work practices:

  • Pathologic examination and processing of formalin-fixed or otherwise inactivated tissues
  • Molecular analysis of extracted nucleic acid preparations
  • Electron microscopic studies with glutaraldehyde-fixed grids
  • Routine examination of bacterial and mycotic cultures
  • Routine staining and microscopic analysis of fixed smears
  • Final packaging of specimens for transport to diagnostic laboratories for additional testing. Specimens should already be in a sealed, decontaminated primary container.
  • Inactivated specimens (e.g., specimens in nucleic acid extraction buffer)

The following activities involving manipulation of potentially infected specimens should be, at a minimum, performed as above and in a certified Class II BSC in a BSL-2 facility. Site- and activity-specific risk assessments should be performed to determine if enhanced biosafety precautions are warranted based on situational needs (e.g. high testing volumes):

  • Aliquoting and/or diluting specimens
  • Inoculating bacterial or mycological culture media
  • Performing diagnostic tests that do not involve propagation of viral agents in vitro or in vivo
  • Nucleic acid extraction procedures involving potentially infected specimens
  • Preparation and chemical- or heat-fixing of smears for microscopic analysis

Clinical Laboratory Testing

Clinical laboratories performing routine hematology, urinalysis, and clinical chemistry studies, and microbiology laboratories performing diagnostic tests on serum, blood, or urine specimens should follow standard laboratory practices, including Standard Precautions, when handling potential COVID-19 patient specimens. For additional information, see Biosafety in Microbiological and Biomedical Laboratories (BMBL) – Fifth Edition (page 225).

Packing, Shipping and Transport

Packaging, shipping, and transport of specimens from suspect cases or PUI’s of COVID-19 must follow the current edition of the International Air Transport Association (IATA) Dangerous Goods Regulationsexternal icon.

Follow shipping regulations for UN 3373 Biological Substance, Category B when sending potential COVID-19 patient specimens.