A family member with hepatitis B is not contagious from summer mosquito bites. Personal protection is needed when someone with hepatitis B is around. Hepatitis B is transmitted from mother to child, blood to blood, and body fluids. Hepatitis B can only be transmitted through the exchange of virus-containing blood on the surface of broken skin or in the blood system. Mosquito bites, on the other hand, do not cause hepatitis B transmission because they only involve the sucking of blood and do not involve the exchange of blood. Mosquito bites are not a more intensive way of coming into contact with a person with hepatitis B. Normal exchange of body fluids such as sharing utensils and intimate apparel may increase the chance of transmission when a person with hepatitis B is around. Therefore, when there is a definite patient around, personal hygiene and cleanliness should be done, regular hepatitis B five tests should be performed, and if the titer of hepatitis B surface antibody decreases, hepatitis B vaccine should be administered in a timely manner. Patients should go to the hospital regularly for follow-up, under the guidance of the doctor, improve the relevant examination, clarify the condition and give systematic and regular treatment.