CBSE Class 9 Answered
What are the different modes of transmission of diseases? Also, give atleast one example of disease of each mode of transmission.
Asked by Topperlearning User | 21 Mar, 2016, 10:22: AM
Expert Answer
Infectious diseases can be spread through the following agents:
i) Through air: Cough or sneeze of an infected person may cause infection to a healthy person if he inhales the droplets containing microbes. Diseases like common-cold, tuberculosis, pneumonia, etc., are spread through air.
2) Through water: Consumption of water contaminated with the spores of bacteria or disease causing microbes can cause diseases like cholera, amoebiasis.
3) Through sexual contact: Unsafe sexual contact with an infected partner many lead to many sexually transmitted diseases. For example, syphilis, AIDS, genital warts, etc.
4) Through vectors: Vectors (animals or microorganisms) carry the infecting agents from a sick person to another potential host. They act as a carrier of a disease or infection. Example- Malaria
Answered by | 21 Mar, 2016, 12:22: PM
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