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Related Concept Videos

Cryptococcal Meningitis01:27

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...

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Related Experiment Video

Updated: Jul 3, 2026

Assessing the Putative Anticryptococcal Properties of Crude and Clarified Extracts from Mollusks
09:18

Assessing the Putative Anticryptococcal Properties of Crude and Clarified Extracts from Mollusks

Published on: December 2, 2022

Reported Cryptococcus neoformans heat-killing protocols show incomplete killing.

Binyi An1, Yingjun Gao1, Yingying Wu2

  • 1Jinling Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210002, China.

FEMS Microbes
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

Heat killing of Cryptococcus neoformans (C. neoformans) is often unreliable. Many protocols fail to achieve complete killing, potentially compromising research reproducibility and biosafety.

Keywords:
Cryptococcus neoformansheat-killingmicrobial killingprotocol standardization

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Area of Science:

  • Microbiology
  • Immunology
  • Vaccine Development

Background:

  • Heat killing is a common method for inactivating microorganisms like Cryptococcus neoformans (C. neoformans).
  • This technique is frequently used in immunological studies and vaccine development.
  • The reliability of existing heat-killing protocols for C. neoformans is not well-established.

Purpose of the Study:

  • To systematically review and experimentally evaluate heat-killing protocols for C. neoformans.
  • To identify factors influencing the efficacy of heat killing.
  • To provide evidence-based guidance for optimizing heat-killing conditions.

Main Methods:

  • Systematic review of 50 publications detailing 23 distinct heat-killing protocols.
  • Experimental validation of selected protocols using virulent C. neoformans strains (H99 and B3501).
  • Assessment of killing efficiency based on temperature, duration, suspension concentration, and sample volume.

Main Results:

  • Only 9 out of 23 tested protocols achieved complete (100%) killing of C. neoformans.
  • 14 protocols resulted in partial killing, with incomplete inactivation potentially going undetected.
  • Suspension volume and fungal concentration were critical factors influencing killing efficacy.

Conclusions:

  • Significant variability and insufficient validation exist in reported heat-killing protocols for C. neoformans.
  • Inconsistent heat killing can undermine experimental reproducibility and biosafety.
  • Standardized, validated protocols are needed for reliable heat inactivation of C. neoformans.