Analyses of pediatric isolates of Cryptococcus neoformans from South Africa.
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Compared to the incidence in adults, cryptococcosis is inexplicably rare among children, even in sub-Saharan Africa, which has the highest prevalence of coinfection with HIV and Cryptococcus neoformans. To explore any mycological basis for this age-related difference in the incidence of cryptococcosis, we investigated isolates of C. neoformans recovered from pediatric and adult patients during a 2-year period in South Africa. From reports to the Group for Enteric, Respiratory, and Meningeal Disease Surveillance in South Africa (GERMS-SA), we reviewed all cases of cryptococcosis in 2005 and 2006. We analyzed one isolate of C. neoformans from each of 82 pediatric patients (<15 years of age) and determined the multilocus sequence type (ST), mating type, ploidy, and allelic profile. This sample included isolates of all three molecular types of serotype A or C. neoformans var. grubii (molecular types VNI, VNII, and VNB) and one AD hybrid. Seventy-seven (94%) of the strains possessed the MATα mating type allele, and five were MATa. Seventy-five (91%) were haploid, and seven were diploid. A total of 24 different STs were identified. The ratios of each mating type and the proportion of haploids were comparable to those for the isolates that were obtained from 86 adult patients during the same period. Notably, the most prevalent pediatric ST was significantly associated with male patients. Overall, these pediatric isolates exhibited high genotypic diversity. They included a relatively large percentage of diploids and the rarely reported MATa mating type.
Genes, Mating Type, Fungal
Molecular Sequence Data
Multilocus Sequence Typing
Mycological Typing Techniques
Sequence Analysis, DNA
Published Version (Please cite this version)10.1128/JCM.01277-10
Publication InfoMiglia, Kathleen J; Govender, Nelesh P; Rossouw, Jenny; Meiring, Susan; Mitchell, Thomas G; & Group for Enteric, Respiratory and Meningeal Disease Surveillance in South Africa (2011). Analyses of pediatric isolates of Cryptococcus neoformans from South Africa. J Clin Microbiol, 49(1). pp. 307-314. 10.1128/JCM.01277-10. Retrieved from https://hdl.handle.net/10161/11069.
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Associate Professor Emeritus in Molecular Genetics and Microbiology
Among patients with AIDS, leukemia or other cancers, organ or bone marrow transplants, and similar immunocompromising risk factors, the incidence of opportunistic mycoses and the number of different fungal pathogens are increasing dramatically. For many of these fungi, the definition of a species and the recognition of pathogen are highly problematic. Conventional methods of identification are based on morphological and physiological characteristics and are often time-consuming, difficult