MICROBIOLOGY

25 Streptococci and Enterococci

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 25 Streptococci and Enterococci

FIGURE 25–1. Group A streptococcus (GAS) Gram stain. Note the oval cocci chaining end to end (arrow). (Image contributed by professor Shirley Lowe, University of California, San Francisco School of…

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54 Intestinal Nematodes

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 54 Intestinal Nematodes

Impact Six intestinal nematodes commonly infect humans: Enterobius vermicularis (pinworm), Trichuris trichiura (whipworm), Ascaris lumbricoides (large roundworm), Necator america-nus and Ancylostoma duodenale (hookworms), and Strongyloides stercoralis. Together, they infect more…

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21 Bacteria—Basic Concepts

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 21 Bacteria—Basic Concepts

FIGURE 21–1. Shapes of bacteria. A. Staphylococcus aureus, cocci arranged in clusters; scanning electron micrograph (SEM). B. Group B streptococci, cocci arranged in chains; SEM. C. Bacillus species, straight rods;…

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51 Apicomplexa and Microsporidia

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 51 Apicomplexa and Microsporidia

PARASITOLOGY DEFINITION The plasmodia are Apicomplexa in which the sexual and asexual cycles of reproduction are completed in different host species. The sexual phase occurs within the gut of mosquitoes…

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33 Enterobacteriaceae

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 33 Enterobacteriaceae

BACTERIOLOGY The Enterobacteriaceae are among the largest bacteria, measuring 2 to 4 μm in length with parallel sides and rounded ends. Forms range from large coccobacilli to elongated, filamentous rods….

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6 Viruses—Basic Concepts

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 6 Viruses—Basic Concepts

FIGURE 6–1. Size comparison of viruses with other microbes. (Adapted with permission from Willey JM: Prescott, Harley, & Klein’s Microbiology, 7th edition. McGraw-Hill, 2008.) Viruses range in size from 20…

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14 Herpesviruses

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 14 Herpesviruses

Large, enveloped, double-stranded DNA viruses Eight HHVs cause a range of diseases HERPESVIRUSES: GROUP CHARACTERISTICS VIROLOGY All herpesviruses are morphologically similar, with an overall size of 180 to 200 nm….

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37 Spirochetes

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 37 Spirochetes

BACTERIOLOGY MORPHOLOGY AND STRUCTURE The spiral morphology of spirochetes (Figure 37–1) is produced by a flexible, peptidoglycan cell wall around which several axial fibrils are wound. The cell wall and…

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55 Tissue Nematodes

Feb 19, 2017 by in MICROBIOLOGY Comments Off on 55 Tissue Nematodes

TOXOCARA TOXOCARA CANIS: PARASITOLOGY AND LIFE CYCLE (FIGURE 55–1) FIGURE 55–1. Life cycle of Toxocara canis. (Reproduced with permission from Roberts RL, Janovy J, Nadler S: Foundations of Parasitology, 9th…

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