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disease Causative agent Spread
Malaria Malaria is caused by single-celled Bite from female
protozoan parasites of the Anopheles mosquito
genus Plasmodium. Four species
infect humans by entering the
bloodstream: Plasmodium falciparum,
which is the main cause of
severe clinical malaria and death;
Plasmodium vivax;
Plasmodium ovale ; and Plasmodium
malaria
Parasitic Trypanosoma In nature, many
bloodborne parasites
are spread by insects
(vectors), so they are
also referred to as
vector-borne diseases.
Covid 19 The virus can spread
from an infected
person’s mouth or
nose in small liquid
particles when they
cough, sneeze, speak,
sing or breathe heavily.
These liquid particles
are different sizes,
ranging from larger
‘respiratory droplets’
to smaller ‘aerosols’.