For which of the following diseases has a definitive vaccine not yet been developed?

Which of the following is a viral disease in humans?

'Smallpox' $(Variola)$ disease is caused by

$Aedes$ is a vector of:

Which of the following diseases is now considered nearly eradicated from India?

$A$ doctor identifies symptoms of nasal congestion,headache,sore throat,hoarseness,and cough in a patient. The conclusion is that the patient is infected by which pathogen?