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30 Cards in this Set
- Front
- Back
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characteristics of a virus
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either RNA or DNA,
protein coat (sometimes in envelope), protein spikes (attachment and entry) |
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obligate intracellular parasite
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an orgnism or acelleluar entity (virus) that requires a host cell to replicate
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shapes
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helical - long rods
polyhedral - many sided complex - have added structures |
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virus replication step 1
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attachment
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virus replication step 2
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entry and uncoat (capsid removal)
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virus replication step 3
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transcription of viral nucleic acid
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virus replication step 4
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replication of viral nucleic acid and synthesis of viral proteins
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virus replication step 5
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synthesis of capsid proteins
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virus replication step 6
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assembly of new complete viral particles
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virus replication step 7
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release of complete virons
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ways virus differs
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-has capsid
-has either dna or rna -always obligate intracellular -can only infect certain cells |
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viroids
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simpler then virus'
short peices of rna causes plant disease |
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prions
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only protein
no rna or dna obligate causes kuru and mad cow |
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examles of virus'
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influenza
mumps measles herpes |
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latent viral infection
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virus is present with no symptoms, herpes main one
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selective media
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E. coli on EMB has green metalic sheen
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contact transmission
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direct - touching
indirect - via inanimate object droplet - sneezing, laughing, talking |
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vehicle transmission
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airborne - carried in air futher then 1 metre e.g Tubuculosis
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vehicle transmission
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water-bourne - faecal contamination drinking water e.g cholera
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vehicle transmission
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food -bourne - poor hygienge, lack of sanitation, poor food handing, e.g salmonella
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vectors
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mechanical - passive transport from insect
biological - e.g malaria |
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sterilisation
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complete destrcutions of all microbes including virus and endospores
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disinfection
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reduction in number of microbes
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antisepsis
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used to reduce microbes especially pathogens, often on skin
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sanitisation
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reduction of numbers to a safe level, usually in food places
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bacteriostatic
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inhibits but doesnt kill bacteria, most antibiotics
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bactricidal
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kills bacteria
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aspesis
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use of sterile equiptment an and antisepsis
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physical methods of control
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heat (moist and dry)
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wooo
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go tess
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