Human-to-human transmission of plague is usually by Group of answer choices unsanitary conditions. the respiratory route. dog flea. rat flea. wounds.

The correct answer is respiratory route.

Explanation: Disease can be transmitted from human to human through respiratory route. This can occur when the infected person cough or sneeze into the air , some particles of the pathogens are released and there is any human around the infected person when he sneez or cough, the person tend to get infected by inhaling or breathing in the infected air.