**Question:** Infections transmitted from vertebrate animals to man is known as

A. Zoonosis
B. Zoophthiasis
C. Zoophthiasis
D. Zoophthiasis

**Core Concept:** Zoonotic diseases are infections that are transmitted between vertebrate animals and humans. These infections can have significant public health implications due to the potential for widespread transmission and the emergence of new diseases.

**Why the Correct Answer is Right:** A zoonosis is a disease or infection that is transmitted from vertebrate animals to humans. It encompasses a wide range of infections, including those caused by bacteria, viruses, parasites, and fungi. The term "zoonosis" is a more comprehensive term for these diseases, as it includes all types of infections that can be transmitted from animals to humans.

**Why Each Wrong Option is Incorrect:**

B. Zoophthiasis: This term is incorrect as it does not accurately describe the transmission of diseases between animals and humans.
C. Zoophthiasis: Similar to option B, this term is incorrect and does not accurately represent the transmission of diseases between animals and humans.
D. Zoophthiasis: This term is incorrect, as it does not accurately describe the transmission of diseases between animals and humans.

**Clinical Pearl:** One example of a zoonotic disease is Lyme disease, caused by the bacterium Borrelia burgdorferi, which is transmitted through the bite of infected ticks. Understanding zoonotic diseases is crucial for healthcare professionals to diagnose, treat, and prevent the spread of these infections in their patients and communities.

**Correct Answer:** A. Zoonosis