Virus Inactivation by Formaldehyde and Common Lysis Buffers.

Area of Science:

• Virology
• Clinical Diagnostics
• Biosafety

Background:

• Mammalian viruses are crucial in diagnostics and research, handled in various sample types.
• Existing virus inactivation protocols lack formal proof of complete safety and efficacy.
• Residual viral infectivity after inactivation, especially at low levels, is poorly understood.

Purpose of the Study:

• To assess the potency and completeness of common virus inactivation methods.
• To evaluate formaldehyde and nucleic acid extraction/lysis buffers for viral inactivation.
• To determine the effectiveness of inactivation on diverse virus types.

Main Methods:

• Tested inactivation procedures on virus-containing specimens.
• Utilized representative RNA and DNA viruses (adenovirus, enterovirus, lentivirus, coronavirus).
• Assessed the reduction in in vitro viral infectiousness after standard protocols.

Main Results:

• A 30-minute formaldehyde incubation at room temperature inactivated all tested enveloped and non-enveloped viruses.
• All tested lysis buffers fully inactivated Human Immunodeficiency Virus type 1 (HIV-1) and Enterovirus type 11 (ECHO-11).
• Only five of seven lysis buffers effectively inactivated SARS-CoV-2 and Adenovirus type 5 (AdV-5).

Conclusions:

• Formaldehyde is a reliable agent for rapid and complete viral inactivation.
• Nucleic acid extraction buffers show variable efficacy in inactivating certain viruses like SARS-CoV-2 and AdV-5.
• Further validation of inactivation protocols is necessary for ensuring laboratory safety and research integrity.