Organisms that are carriers of specific disease-causing germs, but they themselves don't cause any diseases, are called _______ .
A
vectors
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B
virus
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C
germs
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D
pathogens
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Solution
The correct option is A vectors ∙ Some insects and animals carry diseases-causing microorganisms. They are called as vectors. ∙ For example, malaria is a mosquito-borne infectious disease which is transmitted by an infected female Anopheles mosquito with a parasitic protozoan. ∙ In this case, the disease-causing organism is a parasitic protozoan whereas female Anopheles mosquito carrying the parasitic protozoan is a vector which just spreads the disease to other healthy individuals through their bite.