David N. Fredricks
1. The Human Microbiome: What factors determine the constituents of the human genital tract, and how do microbial communities on mucosal surfaces impact health? We use molecular and cultivation approaches to study the ecology of human microbial communities with a focus on the common but poorly understood condition bacterial vaginosis (BV). BV is the most common cause of vaginal discharge and is associated with numerous adverse health outcomes such as HIV infection and preterm birth. Why do some women develop BV, and why are relapse rates high after antibiotic therapy? Our projects span the scale from studies of individual bacterial species interacting with cultured vaginal epithelial cells in the lab, to population studies of women and their partners exploring shifts in microbial communities in response to host physiology or behaviors.
2. Pathogen Discovery: Many microbes have not been successfully cultivated in the laboratory, and therefore molecular cultivation-independent methods are needed to detect them. We develop and deploy nucleic acid sequence-based methods for discovering novel pathogens linked to human disease. We have discovered several novel bacterial species linked with the condition bacterial vaginosis using this molecular approach. We are searching for novel pathogens in several idiopathic human diseases.
3. Molecular Diagnostics: We seek to improve the detection of known human pathogens by developing sensitive and specific diagnostic tests. These assays rely on the detection of microbial nucleic acid sequences in human tissues or body fluids. Our main focus is the use of PCR for the diagnosis of fungal infections in cancer patients, but we also develop assays for detecting other pathogen groups such as bacteria and viruses.
Recent Publications from PubMed
- Evaluation of Posaconazole Serum Concentrations from Delayed-Release Tablets in Patients at High-Risk for Fungal Infections.Chin A, Pergam SA, Fredricks DN, Hoofnagle AN, Baker KK, Jain RAntimicrobial agents and chemotherapy. 2017 Jul; :
- Efficacy of oral pre-exposure prophylaxis (PrEP) for HIV among women with abnormal vaginal microbiota: a post-hoc analysis of the randomised, placebo-controlled Partners PrEP Study.Heffron R, McClelland RS, Balkus JE, Celum C, Cohen CR, Mugo N, Bukusi E, Donnell D, Lingappa J, Kiarie J, Fiedler T, Munch M, Fredricks DN, Baeten JM,The lancet. HIV. 2017 Jul; :
- Mitchell CM, Srinivasan S, Zhan X, Wu MC, Reed SD, Guthrie KA, LaCroix AZ, Fiedler T, Munch M, Liu C, Hoffman NG, Blair IA, Newton K, Freeman EW, Joffe H, Cohen L, Fredricks DNMenopause (New York, N.Y.). 2017 Jun; :
- Evaluating the accuracy of amplicon-based microbiome computational pipelines on simulated human gut microbial communities.Golob JL, Margolis E, Hoffman NG, Fredricks DNBMC bioinformatics. 2017 May; 18 1: 283
- Disseminated coccidioidomycosis presenting with intramedullary spinal cord abscesses: Management challenges.Bajema KL, Dalesandro MF, Fredricks DN, Ramchandani MMedical mycology case reports. 2017 Mar; 15 : 1-4