Neither; a tumour is a group of ordinary cells that have mutated for one reason or another, and have started to grow out of control.
"Encephalitis" is not a type of cell, it is an inflammation of the brain, caused by either a virus or bacteria.
Bacteria and virus
Smallpox was a virus.
virus
a bacteria. the bacteria that causes pneumonia is called pneumoniae.
Bacteria Virus
Virus
Virus
Virus
virus
Mutations of Bacteria from Virus Sensitivity to Virus Resistance was created in 1943.
No bacteria is huge compared to a virus