This will be a matter of opinion.
The black plague and Ebola are bacteria
malaria is a parasite.
The deadly disease caused by virus is CANCER.
The two most deadly spiders to humans are black widow spiders and tarantula.
In Winnipeg, Manitoba. We have one of the most advanced virology labs in the world, containing some of the planet's rarest and most deadly viruses.
Yes ... all viruses are deadly ... and they are everywhere ... the only way to be safe is to live in a bubble.
This is not the case. There are hundreds of types of viruses which cause deadly diseases in plants.
Ebola is caused by one of four Ebola viruses: Ebola Zaire (most deadly), Ebola Sudan, Ebola Cote d' Ivoire, and Ebola Reston (found in Virgina, US, not deadly to humans)
There are a number of different viruses with different descriptions in the world. Some cause very deadly diseases even though they are not living.
Attack by viruses attack by hackers
If you do not seal a tin can correctly it can contain Pathogens, or deadly bacteria thatcan shut down the nervous system.
the most deadly planet is neptune (as of 2010)
you could get malaria and other disease that eats the brain
mrsa is the most unknown and deadly disease