Salmonella typhi generally enter the small intestine through.........and migrate to other body parts through....... . The correct combination to fill the blanks is

The human liver fluke depends on how many intermediate host or vectors ?

Internal bleeding, muscular pain, fever, anaemia and blockage of the intestinal passage are the common symptoms of

Which is an example of active immunity ?

Damage to thymus in a child may lead to

Trembling, depression, fear and phobia are signs of