**Question:** With reference to mumps, which of the following is true?

A. Mumps is a viral infection caused by the parvovirus B19.
B. Mumps is primarily transmitted through respiratory droplets.
C. Mumps is a rare childhood disease in developed countries due to widespread vaccination.
D. Mumps primarily affects pregnant women, leading to severe complications like abortions and stillbirths.

**Correct Answer:**

C. Mumps is a rare childhood disease in developed countries due to widespread vaccination.

**Core Concept:**

Mumps is a viral infection caused by the mumps virus, which belongs to the Paramyxoviridae family. The virus primarily targets salivary glands, leading to the characteristic swelling of the salivary glands known as **Mumps**. Mumps can affect other organs as well, such as the testes, ovaries, and pancreas.

**Why the Correct Answer is Right:**

Mumps is a childhood disease predominantly affecting children between 5 and 15 years old, although it can occur at any age. In developed countries, such as the United States and Europe, vaccination has significantly reduced the incidence of mumps. The Mumps, Measles, Rubella (MMR) vaccine, which is part of the standard childhood immunization schedule, provides immunity against mumps and other viral infections. As a result, mumps is now considered a rare disease in these regions.

**Why Each Wrong Option is Incorrect:**

A. Mumps is caused by the parvovirus B19, which is different from the mumps virus. Parvovirus B19 primarily affects the skin, liver, and bone marrow, causing a different disease known as **Petechial fever** or **Purpuric fever**.

B. While respiratory droplets can transmit mumps to susceptible individuals, the primary mode of transmission is through direct contact with saliva from an infected person (e.g., through shared utensils, toys, or close contact). Transmission via respiratory droplets is not the primary mode.

D. Mumps primarily affects the testes, ovaries, and pancreas, causing inflammation and swelling. However, the statement about pregnant women and severe complications is not entirely accurate. While mumps can cause complications in pregnant women, it is not limited to them. The statement is more relevant to the MMR vaccine and its impact on the incidence of mumps in developed countries.

**Clinical Pearls:**

1. Mumps is a vaccine-preventable disease, and the MMR vaccine is an essential component of childhood immunization programs.
2. In unvaccinated populations, mumps remains a concern, particularly in regions where vaccination rates are low or where the virus has evolved to evade the vaccine.