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COVID-19 - Coggle Diagram
COVID-19
characteristics and causes of COVID-19
corona virus is an
ecological hazard
is a large family of viruses common in humans and animals, including bats, cows and cats
they cause upper respiratory infections ranging from common cold to more serious illness
is highly transmittable viral disease that causes respiratory infections in humans and can be fatal
causes of covid-19
severe acute respiratory syndrome corona virus (SARS-CoV-2)
believed to be bats due to genetic similarities of the virus to previous corona virus
WHO states that transmission of COVID-19 to humans happened through an intermediate host handled by humans
zoonotic ecological hazard
: infectious disease that can be naturally transmitted between animals and humans
spread of the virus
primary spread through airborne droplets of the virus with saliva or discharge from the nose when an infected person coughs or sneezes
can be spread from a person touching contaminated objects or surfaces
once it enters body it invades the cells along the respiratory tract
the virus instructs cell to aka copies of the virus, these copies spread and invade new cells
symptoms: fever, cough, fatigue, shortness of breath, sore throat and headache
physical and human processes that determine distribution of COVID-19
physical processes
more contagious
more efficient at attaching to and attacking cells
infiltrates the entire respiratory tract
high chance of spreading the virus during incubation period, up 24-48 hours before symptoms appear
infects cells is upper and lower respiratory tract, nose, throat and lungs. differs from other covid that only infect upper respiratory tract
greater coverage of infected cells increases probability of transmission
variations of the virus
responsible for COVID-19 continually develops different variants
most have similar symptoms, scientists found that different variants were more aggressive in attaching to and infecting human cells
result in greater infections rates, making the virus more transmissible
delta variant double the transmissibility of the original strain. due to increased virus replication within the airway system and a longer window of transmission
omicron variant spreads more easily than the original virus and the delta variant
human processes
travel
movement of poeple and goods, particular by places and ships has spread the virus from country to country
returning overseas travellers introducing covid-19 to their home countries
travellers returning from Italy and Iran were responsible for a large proportion of change in the distribution of the disease
eg. travenellers from Iran reported to have a spread t 14 countries during first month
covid-19 reactions and response
some governments slow to react an instigate mitigation strategies which allows the virus to spread rapidly
government tried to balance keeping economics operating while introducing restriction
eg. italy did not listen to warnings and implement strict restrictions, resulting in over 100,000 cases and 1,000 deaths within the first three months
island nations
small nations had an advantage landlocked countries
greater control at stopping travellers by closing borders