Viral & protozoal causes of gastroenteritis Flashcards
What is the main component of a virus?
their small genome that can be sing or double stranded DNA or RNA
What is the extracellular state of a virus called? and what is its structure
Virion
central viral genome - nucleic acid
covered by caspid - protein recognise and bind to host cell
sometimes envelope - outer membrane
What happens when the virus enters the cell?
cashed or envelope removed not a viroid anymore
What are the two modes or replication a virus can take?
lytic - synthesis of its own genome & caspid/envelope and new viroids released
lysogenic - virus allows or directs cells to divide then switches to lytic
What are the two classifications of viruses?
enveloped viruses
naked virus - lack envelope
What type of virus is the rotavirus? how does it work
naked dsRNA
cpasid proteins bind to receptors on enterocyte & induces import of virus via lysosomes
What type of virus is the norovirus?
+ssRNA
What are the 3 protozoa that cause gastroenteritis?
giardia intestinalis
entamoeba histolytica
cryptosporidium sp.
