Question

Now a days Corona viruses make havoc throughout the world and there is no single country

where no case of corona is found. Though all countries try to make vaccine for corona viruses

but no one get the success. Give the reasons why it is difficult to make vaccines for viral disease

as compare to bacterial or protozoanal diseases . ​

Answer 1

Answer:

Trypanosoma cruzi causes Chagas disease and is transmitted by the reduviid bug, also known as the “ kissing bug.” Chagas disease is diagnosed using a physical

Explanation:

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