infectious agents Flashcards
infectious agent replication: explain how each of the different types of infectious agent replicate, recall the distinguishing features of each type
define virus
obligate parasite
what does a virus use to replicate
host cell nuclear synthetic machinery
what can viruses be made from
RNA or DNA
what do viruses do within a cell
hijack nuclear and protein machinery to produce more copies then bud out
what type of virus is HIV
retrovirus
what is a retrovirus
RNA virus which uses reverse transcriptase to produce DNA which incorporates itself into the nucleus of a host cell to produce many more RNA copies and proteins
components of bacteria
peptidoglycan cell wall, chromosomal DNA, some have plasmids
how do bacteria divide
binary fission
Shigella spp. transmission
fecal-oral
what does Shigella spp. target
GIT
how does Shigella spp. move
uses host actin
what does meningitis block
blood supply to limbs
stages of meningitis
colonisation → septicaemia (septic shock → severe inflammatory response) → cerebrospinal fluid and brain
4 types of fungi
yeasts/filaments, cutaneous, mucosal, systemic mycoses
Candida as yeast and filament
yeast (bud), filament (hyphae) or both
