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Infectious agents Diseases

Virus Common cold, Dengue, Influenza, AIDS

Bacteria Typhoid ,Cholera, Anthrax, Tuberculosis

Protozoan Malaria, kala-azar, Sleeping sickness, Amoebic dysentry

Fungi Many common infectious diseases, skin infections

Worms/Nematodes Worm infection, elephantiasis

Peptic ulcers

 In 2005, Barry Marshall and Robin Warren were awarded the Nobel Prize in

Physiology or Medicine for their discovery that peptic ulcer disease (PUD) was
primarily caused by Helicobacter pylori, a bacterium with affinity for acidic

environments, such as the stomach.

 Peptic ulcers are open sores that develop on the inside lining of your stomach
and the upper portion of your small intestine. The most common symptom of a

peptic ulcer is stomach pain. Peptic ulcers include: Gastric ulcers that occur on
the inside of the stomach. Peptic ulcers can be cured only when bacteria are

killed in the stomach using appropriate antibiotics,

COMPARATIVE ACCOUNT OF VIRUS, BACTERIA

 Bacteria – All bacteria are closely

related to each other and share a
common biochemical pathway for

living.