Write the names of two causes for spread of diseases.

Write the name of causative organism and symptoms of disease pneumonia.

(i) Write the scientific names of the two species of filarial worms causing filariasis. (ii) How do they affect the body of infected persons(s)? (iii) How does the disease spread?

Following are the names of few vectors. Name the diseases whose causative agents these vectors spread: (a) Sandfly (b) Rat flea (c) Housefly (d) Culex mosquito.

Name two diseases that spread through water.

Give the name of one causative organism of the filariasis disease.

Write notes on : (a) Vaccination (b) Causes of diseases (c) Signs and symptoms of diseases (d) Means of spread of infectious diseases.