Xiao Sanyang: Less contagious.

HBsAg carrier: non-infectious or suspicious.

In addition, there are four main ways of transmission of hepatitis B: vertical transmission of blood and body fluids from mother to child and iatrogenic transmission. Other daily contact is very contagious. Try not to use towels, bowls, chopsticks and other daily necessities in daily life, although the infection rate is the same as winning the lottery.

Hepatitis B virus is a non-gastrointestinal virus, so under normal circumstances, hepatitis B virus will not spread through the digestive tract and respiratory tract, so kissing will generally not infect hepatitis B.

However, the saliva in the mouth of patients with hepatitis B contains hepatitis B virus. In daily life, when a healthy person kisses a patient with hepatitis B, if there are oral ulcers, oral mucosal injuries or gingival bleeding in the healthy population, the hepatitis B virus contained in the oral saliva of the patient with hepatitis B will invade the healthy person through these wounds, leading to the infection of the healthy person with hepatitis B virus. Therefore, under normal circumstances (no bleeding, wounds, ulcers and other injuries in the lips, mouth and throat), kissing will not infect hepatitis B, but excluding normal circumstances, it is recommended that your roommate go to a regular liver hospital to do five hepatitis B tests in time to see if he is infected with hepatitis B virus.

Although kissing generally does not infect hepatitis B, in real life, it is also spread by kissing, so we must pay attention to the vaccination of hepatitis B vaccine, so as to effectively prevent the invasion of hepatitis B virus.