Kala-azar is caused by

Except skin, other physical barriers which also helps to prevent the entry of the microorganisms are

$I.$ mucus coating of the epithelium lining the respiratory

$II.$ gastrointestinal tracts

$III.$ urogenital tracts

Choose the correct option

Tunnel vision is caused by

When a person dies after stung by bee followed by the administration of penicillin, death may be due to

Melanin and lewy bodies occur in the neurons in case of