Can "big three positive" and "small three positive" hepatitis B spread to family members through sharing meals?

Apr 10, 2023 Source: Cainiu Health

Dr. Jiang Weimin

Introduction

When individuals with "big three positive" or "small three positive" hepatitis B eat meals, if they practice separate dining and regularly sterilize tableware thoroughly, and there are no conditions such as oral ulcers or bites, or if family members have strong immunity or have already been vaccinated against hepatitis B, transmission generally does not occur. However, sharing tableware while both parties have oral sores may lead to infection through wounds, and the risk of transmission from "big three positive" is higher than from "small three positive."

Generally speaking, whether having meals together with someone who is "big three positive" or "small three positive" will infect family members depends on whether utensils are shared and whether there are oral ulcers or wounds present. If utensils are not shared, or if no oral ulcers or wounds exist when sharing utensils, infection usually does not occur. However, sharing utensils while having open oral wounds may lead to transmission. The specific analysis is as follows:

1. Unlikely to transmit

If separate meals are practiced and utensils are regularly and thoroughly disinfected, and if there are no conditions such as oral ulcers or bites, transmission generally will not occur—especially if family members have strong immunity or have already received the hepatitis B vaccine. This is because the hepatitis B virus is primarily transmitted through blood; without blood-to-blood contact, transmission is unlikely.

2. Possible transmission

Sharing utensils when both parties have oral ulcers or mucosal damage may allow the hepatitis B virus from a "big three positive" or "small three positive" individual to enter the body through these wounds and infect others. The risk of transmission is higher with "big three positive" than with "small three positive."

Using separate utensils and seeking timely medical treatment to suppress viral load can help reduce the risk of transmission.

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