Chapter 25 Flashcards
difference between infection and disease
Infection: whether or not host is harmed it is a microbe growing in a host
disease: injury to organism affection host functions
what is pathogenicity
the ability of a parasite to inflict damage
what is adherence
enhanced microbial ability to attach to host (it is necessary but not sufficient for disease)
INFECTION AND DISEASE PROCESS CHART
INFECTION AND DISEASE PROCESS CHART
what are receptors in regards to pathogens
many ones coat pathogens and tissues and it is where pathogens can bind
what proteins are responsible for adhesins
glycoproteins or lipoproteins on pathogen surface
Characteristics of capsules
FIRST it is an adherence structure
sticky, has specific receptors that can facilitate attachment to host tissues, can protect microbes from ingestion by white blood cells
other adherence structures
fimbriae, pili, flagella
how does colonization occcur
gain access to host tissues and growth of microorganisms
typically starts with mucous membranes
secretion of protein and glycoprotein
CUTS WOUNDS and punctures also provide access to microbes
what are dental caries
an oral microbial disease caused by streptococcus
S. sobrinius and S. mutans) that make contact with tooth surface and reproduce and form a biofilm (called a plaque
what are biofilms
planktonic growth: growth as suspension
sessile growth: grow while attached to surface and can developed into biofilms
how are biofilms formed
sessile growth: attached polysaccharide matrix that can contain other macromolecules (i.e. protein, DNA, lipids)
functionalities of biofilms
prevents harmful chemicals from penetrating, prevent protists from grazing (white blood cells) phagocytosis (engulfment) is hindered and also prevents washing away of cells
how to judge invasiveness
- ability of growth in host tissue
2. the growth reaches densities that inhibit host functions
what is bacteremia
presence of bacteria in bloodstream
