During the Covid-19 pandemic, individuals around the world were advised to wear masks covering their nose and mouth. Why is this medical advice important for decreasing the spread of the SARS-CoV-2 virus?

• A. Face masks cover the openings to our respiratory system, which is the portal of entry for the SARS-CoV-2 virus.
• B. Face masks cover the openings to our respiratory system, which is the portal of exit for the SARS-CoV-2 virus.
• C. Face masks cover the openings to our digestive system, decreasing the entry of opportunistic pathogens.
• D. A and B.
• E. A and C.
• F. All of the above.

Answer: (D)

Verified step by step guidance

1. Understand the primary mode of transmission for SARS-CoV-2, which is through respiratory droplets that are expelled when an infected person coughs, sneezes, talks, or breathes.
2. Recognize that the nose and mouth are key entry points for the virus into the respiratory system, making them critical areas to protect in order to prevent infection.
3. Acknowledge that the nose and mouth are also key exit points for the virus, as an infected person can release viral particles into the environment through these openings.
4. Consider the role of face masks in blocking respiratory droplets from both entering and exiting the respiratory system, thereby reducing the spread of the virus.
5. Evaluate the given options: A and B are correct because they address the respiratory system as both a portal of entry and exit for the virus, while C is incorrect as it refers to the digestive system, which is not the primary concern for SARS-CoV-2 transmission.