Chapter 37, Problem 7A

Summary Introduction

Introduction:

Direct contact transmission usually occurs when there is physical contact between an infected person and a healthy person. Indirect contact transmission occurs when there is no direct human-to-human contact but transfers through droplet infection. Some organisms can transfer diseases from human to human directly or indirectly.

Answer to Problem 7A

Correct answer:

The correct answer is option (D) vector transmission.

Explanation of Solution

Explanation/justification for the correct answer:

Option (D) vector transmission. The picture shown is called as mechanical vector which are flies that pick up infectious agents on the outside of their bodies and transmit them through physical contact.

Explanation for incorrect answer:

Option (A) direct contact. The picture has not shown any direct contact. So, this is an incorrect answer.

Option (B) air transmission.The picture has not shown any air transmission. So, this is an incorrect answer.

Option (C) object transmission. Object transmission causes when someone touches an object such as doorknob, etc. So, this is an incorrect answer.