List the causative agent, mode of transmission and symptoms for Diptheria and Typhoid.

A patient was hospitalized with fever and chills. Merozoites were observed in her blood. What is your diagnosis?

(i) Write the scientific name of the filarial worm that causes filariasis.
(ii) Write the symptoms of filariasis.
(iii) How is this disease transmitted?

List the common withdrawal symptoms of drugs and alcohol abuse.

Why do you think it is not possible to produce vaccine against 'common cold'?