What is the fine-grained topic of the following text: © 2011 Perera et al; licensee BioMed Central Ltd.
Perera, R. A. P. M.; Tsang, P. C. S.; Miller, Craig S.; Li, P.; Lee, M. P.; and Samaranayake, L. P., "Identification of differential pharyngeal cytokine profiles during HIV infection" (2011). Only return the topic.
Identification of differential pharyngeal cytokine profiles during HIV infection