module 5 Flashcards
covid-19 is caused be a virus known as
SARS-CoV-2
it is a positive sense single-stranded RNA virus
all coronaviruses
- are positive-sense single stranded RNA viruses
- infect mammals and birds
- cause respiratory tract infections in humans
- have characteristic club-shaped spikes on the outside
covid-19 is transmitted by
airborne transmission
how long after exposure does symptoms of covid appear
2-14 days after exposure
how many people are asymptomatic
1 in 5 or 20%
4 reasons for the major impact of covid-19
- human-human transmition
- high Ro
- Asymptomatic and pre-symptomatic transmition
- high mortality rate
true/false covid 19 is not vector-borne transmition
true
death rate of covid 19
1-2%
mRNA vaccines (pfizer/bioNTech, Moderna)
mRNA injected directs cells to produce the spike protein which trains the bodys immune system
vector vaccines (oxford/AstraZeneca)
a harmless virus containing genetic material from SARS-CoV-3 is injected
Protein subunit vaccines
harmless proteins that are components of the virus are injected
lineage is
a group of closely related viruses witha common ancestor
A variant is
a viral genome that may contain one or more mutations that differentiate it from other variants of the SARS-CoV-2 viruses
a variant of high consequence(VOHC)
is a variant for which current vaccines do not offer protection
A variant of concern(VOC)
has been observed to be more infectious and is more likely to cause breakthrough infections or reinfections in those who are vaccinated or previously infected
variant of intrest(VOI)
a coronavirus that compared with earlier forms of the virus has genetic characteristics that predict greater transmissiblity
