Which of the following conditions is likely to be contagious?

Strep throat is caused by the bacteria Streptococcus pyogenes, which is known to be highly contagious. It is primarily spread through respiratory droplets when an infected person coughs or sneezes, and it can also be transmitted by sharing food or drink, or by contact with surfaces contaminated with the bacteria. The symptoms typically manifest within a few days after exposure, making it important for those infected to avoid close contact with others to prevent spreading the infection.

In contrast, sinusitis, while it can occur alongside a viral upper respiratory infection, is not considered contagious. Nasal polyps are non-cancerous growths that occur in the nasal passages and are not infectious. Larynx cancer is a malignancy and is also not contagious, as cancers do not spread from person to person. Understanding the distinctions among these conditions can aid in recognizing which ones pose a risk of transmission to others.