HOW BACTERIAL PATHOGENS PENETRATE HOST DEFENSES

HOW BACTERIAL - HOW BACTERIAL PATHOGENS PENETRATE HOST DEFENSES . 1. walls,whichincreasesthe

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HOW BACTERIAL PATHOGENS PENETRATE HOST DEFENSES   Most pathogens must penetrate tissues to cause disease. Factors that contribute to the ability of  bacteria to invade a host:      1. Capsules----some bacteria form an organized glycocalyx called a capsule around their cell  walls, which increases the virulence of the species. The capsule helps resist host defenses by  interfering with phagocytosis. If the human body produces antibodies against the capsule, this  can allow destruction of the bacteria by phagocytosis.    Streptococcus pneumoniae  owes its pathogenicity to the presence of a capsule. Strains without a  capsule are avirulent (do not cause disease); strains with a thin capsule cause a mild pneumonia;  strains with a thick capsule cause a severe or fatal pneumonia. Other bacteria which need a  capsule to aid them in causing disease include 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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HOW BACTERIAL - HOW BACTERIAL PATHOGENS PENETRATE HOST DEFENSES . 1. walls,whichincreasesthe

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