Sinusitis is not a contagious disease and does not have definite transmissibility, as sinusitis is mainly due to acute or chronic bacterial infections. A small portion of patients suffer from fungal sinusitis caused by fungal infections. Generally speaking, sinusitis is an inflammatory response and is not contagious, so it does not qualify as a communicable disease. In terms of treatment, conservative drug treatment is the primary approach, with oral medications and nasal sprays being the first choice, along with the use of saline or separated seawater for irrigation. Generally, conditions can be effectively controlled with medication. For cases of fungal infection, or chronic sinusitis where conservative drug treatment is ineffective, it may be advisable to consider endoscopic sinus surgery, which generally involves minimally invasive procedures with relatively minimal trauma and good outcomes.