Sialadenitis is an inflammation of the salivary glands, usually caused by a bacterial infection. It is not typically contagious from person to person. However, the bacteria causing the infection can spread through direct contact with saliva or respiratory droplets, so it is important to practice good hygiene, such as washing hands frequently and avoiding sharing utensils or personal items. If you suspect you have sialadenitis, it is advisable to consult a healthcare professional for proper diagnosis and treatment.