Answer:
The
different modes of transmission of infectious diseases are as follows:
A. Direct transmission
(i)By direct contact: Disease like AIDS, leprosy, skin,
eye infections, etc. are transmitted by direct contact with source.
(ii) By droplets: Diseases like respiratory infections,
common cold, diphtheria, tuberculosis, etc. are transmitted by droplets.
(iii) By contact with soil: Soil has disease agents like
hookworm larvae, etc. that cause diseases like tetanus.
(iv) By inoculation: Inoculation into skin through
contaminated needles and syringes, etc. of rabies virus, syphilis, hepatitis B
and AIDS, etc.
B. Indirect transmission: Transmission of disease-causing
microbes takes place through vectors like flies, etc. For example: typhoid.
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