52 Sarcomastigophora—The Amebas
PARASITOLOGY Entamoeba histolytica is found throughout the world and the causative agent of diarrhea and amebic dysentery. Infections may spread to extraintestinal sites and become life-threatening. Close to 500 million…
12 Enteroviruses
VIROLOGY MORPHOLOGY AND BIOLOGIC FEATURES As a group, the enteroviruses are picornaviruses that are extremely small (22-30 nm in diameter), naked capsid virions with icosahedral symmetry. They possess single-stranded, positive-sense…
11 Poxviruses
POXVIRUSES: GROUP CHARACTERISTICS Poxviruses are large, brick-shaped or ovoid, linear double-stranded DNA (130-300 kbp) containing core within a double membrane and a lipoprotein envelope carrying virions measuring approximately 350 ×…
48 Parasites—Basic Concepts
Major cause of disease and death worldwide Currently, about half of the world’s population lives in areas where malaria transmission could or does occur; of these, approximately 250 to 400…
42 Fungi—Basic Concepts
FIGURE 42–1. A yeast cell showing the cell wall and internal structures of the fungal eukaryotic cell plan. (Reproduced with permission from Willey JM: Prescott, Harley, & Klein’s Microbiology, 7th…
41 Dental and Periodontal Infections
FIGURE 41–1. Dental plaque biofilm. The stages of formation of the bacterial biofilm called dental plaque are shown. Early colonizers bind to the enamel pellicle and late colonizers bind to…
