Disseminated Cryptococcus deuterogattii (AFLP6/VGII) infection in an Arabian horse from Dubai, United Arab Emirates.

The research paper is about the investigation of a fatal case of a disseminated Cryptococcus gattii infection (Cryptococcus deuterogattii, specifically) in an Arabian horse brought in from South Africa to the United Arab Emirates.

Analysis of the Cryptococcal Infection

• The researchers analyzed a fatal infection caused by C. gattii sensu lato, a type of yeast, in an 11-year-old Arabian horse. This horse was imported from South Africa into the United Arab Emirates.
• The tissue samples from this horse were studied using conventional mycology procedures. These procedures are standard methods used to study fungi and help the researchers to understand the type and scope of the infection.
• The cryptococcal isolate obtained from these tissues was characterized in specific ways to understand its molecular makeup. They determined its mating type, amplified fragment length polymorphism (AFLP) fingerprinting, and multi-locus sequence typing (MLST).
• The AFLP and MLST methodologies are genetic techniques that provide detailed insights into the characteristics of microbes. They offer information about the genetic differences and relatedness among various strains of a particular microbe.

Identification of the Cryptococcal Isolate

• The isolate obtained from the horse was identified as Cryptococcus deuterogattii (AFLP6/VGII), with an alpha mating type. Cryptococcus deuterogattii is a species of Cryptococcus gattii, a type of yeast that can cause serious, even fatal infections.
• The mating type alpha indicates the sex of the yeast. Yeasts have two mating types, denoted as ‘a’ and ‘alpha’, and in this case, the identified yeast was of the ‘alpha’ mating type.

Phylogenetic Analysis and Geographic Origin

• To investigate the geographic origin of the cryptococcal isolate, researchers performed a phylogenetic analysis. This kind of analysis helps to trace the evolutionary relationships among different organisms or genes.
• From this analysis, researchers found that the isolate was closely related to another C. deuterogattii isolate from the Middle East. This suggests that the horse likely acquired the infection in the Middle East, not South Africa.

Conclusion

• The paper concludes by proposing that this is the second case of a C. deuterogattii infection in the Middle East, and emphasizes the need for further research into why horses in this region may be more susceptible to such infections.