Which of the following is a common sign of infection?

Which of the following is a common sign of infection?

• A. Redness
• B. Nausea
• C. Dizziness
• D. Hair loss

Answer: (A)

Redness is a common sign of infection because the body's inflammatory response increases blood flow to the affected area to bring immune cells to fight the invading microbes. This vasodilation makes the skin appear red and often warmer or tender. Other options don’t fit as typical signs: nausea can occur with many illnesses but isn’t a specific indicator of infection at a site; dizziness isn’t a classic infection signal and can stem from dehydration or other issues; hair loss isn’t a typical sign of infection and points to different health problems. So redness stands out as a classic, observable sign of infection.

Redness is a common sign of infection because the body's inflammatory response increases blood flow to the affected area to bring immune cells to fight the invading microbes. This vasodilation makes the skin appear red and often warmer or tender. Other options don’t fit as typical signs: nausea can occur with many illnesses but isn’t a specific indicator of infection at a site; dizziness isn’t a classic infection signal and can stem from dehydration or other issues; hair loss isn’t a typical sign of infection and points to different health problems. So redness stands out as a classic, observable sign of infection.