All viruses, for example, live inside host
cells, whereas bacterịa very rarely do. Viruses,
bacteria and fungi multiply very quickly, while
worms multiply very slowly in comparison.
Taxonomically, all bacteria are closely related
to each other than to viruses and vice versa.
This means that many important life
processes are similar in the bacteria group
but are not shared with the virus group. As a
result, drugs that block one of these life
processes in one member of the group is likely
to be effective against many other members
of the group. But the same drug will not work
against a microbe belonging to a different
group.
biotics.
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Answers
Answer:
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Step-by-step explanation:
Infectious Diseases
Infectious Agents
We have seen that the entire diversity seen in the living world can be classified into a few groups. This classification is based on common characteristics between different organisms. Organisms that can cause disease are found in a wide range of such categories of classification. Some of them are viruses, some are bacteria, some are fungi, some are single-celled animals or protozoans. Some diseases are also caused by multicellular organisms, such as worms of different kinds.

Fig.1.

Fig.2. Picture of staphylococci, the bacteria which can cause acne.
The scale of the image is indicated by the line at top left, which is 5 micrometres long.

Fig.3. Picture of Trypanosoma, the protozoan organism responsible for sleeping sickness.
The organism is lying next to a saucer-shaped red blood cell to give an idea of the scale.
Copyright: Oregon Health and Science University, U.S.

Fig.4.Picture of Leishmania, the protozoan organism that causes kala-azar.
The organisms are oval-shaped, and each has one long whip-like structure. One organism (arrow) is dividing, while a cell of the immune system (lower right) has gripped on the two whips of the dividing organism and is sending cell processes up to eat up the organism. The immune cell is about ten micrometres in diameter.

Fig.5.Picture of an adult roundworm (Ascaris lumbricoides is the technical name) from the small intestine.
The ruler next to it shows four centimetres to give us an idea of the scale.
Common examples of diseases caused by viruses are the common cold, influenza, dengue fever and AIDS. Diseases like typhoid fever, cholera, tuberculosis and anthrax are caused by bacteria. Many common skin infections are caused by different kinds of fungi. Protozoan microbes cause many familiar diseases, such as malaria and kalaazar. All of us have also come across intestinal worm infections, as well as diseases like elephantiasis caused by diffferent species of worms.