Hepatitis B is generally not contagious if you accidentally come into contact with a hepatitis B patient’s saliva. HBV is not transmitted through the respiratory and digestive tracts. Therefore, daily study, work or living contacts, such as working in the same office (including sharing computers, etc.), shaking hands, hugging, living in the same dormitory, eating in the same restaurant and sharing toilets, and other contacts that do not involve blood exposure, will not transmit HBV. Also, epidemiologic and experimental studies have not found that HBV can be transmitted by blood-sucking insects (mosquitoes, bedbugs, etc.). Currently, hepatitis B vaccination is the most effective way to prevent HBV infection, and it is recommended that individuals actively receive hepatitis B vaccination when their physical condition permits. If Hepatitis B is diagnosed, one should go to the hospital in time for treatment and follow up under the assessment of a physician.