Q16 of 44 Page 32

i) Give any three examples for the most infectious diseases in man and their causative agents.

ii) To discover medicine for viral infected diseases like AIDS is more difficult than other diseases. Is the statement true or false? Discuss.


i) Examples for the most infectious diseases:


Influenza is caused by A (H1N1) Virus, is highly contagious (infectious),


Tuberculosis is caused by Mycobacterium, a rod-shaped bacterium.


Typhoid is caused by a short rod-shaped bacterium with numerous flagella Salmonella typhi.


ii) Antibiotics are useless against viral infections. This is because viruses are so simple that they use the energy of the host cells to perform their activities. Hence, antibiotics do not work for them.


More from this chapter

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14

Match the following:























List I (Disease)



List II ( Symptoms)



A. Amoebiasis



I) Chills and high fever recurring for 3 to 4 days



B. Tuberculosis



II) Patches on skin and nails with itching sensation



C. Ringworm



III) Abdominal pain with blood and mucus in stools



D. Malaria



IV) Persistent cough and loss of body weight



 15

List out the diseases based on their mode of transmission (water borne, air borne, and sexual contact)

i) cholera ii) typhoid


iii) tuberculosis iv) leprosy v) syphilis


vi) gonorrhoea vii) pneumonia


viii) common cold ix) amoebic dysentery x) AIDS


 17

A student had an attack of measles and recovered from the infection. His science teacher said that he will not get that disease again in his life time. Is it true? Why?

 18

Name the causative organisms responsible for ring worm in humans? Mention the symptoms of the infection.