Final answer:
The most likely symptom noted in a 3-year-old with community-acquired pneumonia is fever and cough.
Step-by-step explanation:
The most likely symptom noted in a 3-year-old with community-acquired pneumonia is fever and cough. Pneumonia is an infection in the lungs, usually caused by bacteria or viruses. In children, symptoms may also include loss of appetite and respiratory distress. It is important to seek medical attention if symptoms persist or worsen.